SK210LC-9 Shop Manual

HYDRAULIC EXCAVATOR

SHOP MANUAL

model

SK210LC-9

INDEX 1

SPECIFICA SPECIFI CATIONS TIONS SECTION

2

MAINTENANCE SECTION

S N O I T A C I F I C E P S

E C N A N E T N I A M

M E T S Y S

21. ［21.

21.

MECH MECHATR ATRO O CONTRO CONTROLLE LLER R］

MECHAT HATRO CO CONTRO TROLL LLE ER T AB LE OF CONTENTS

21.1

SUMMAR SUMMARY Y OF MECHATR MECHATRO O CONTROL CONTROL SYSTEM SYSTEM

��21-4

21.1.1 21.1.1

MECHATR MECHATRO O CONTROL CONTROL SYSTEM IN GENERAL GENERAL ��21-4

21.1.2 21.1.2

UNLOAD UNLOAD VALVE VALVE CONTR CONTROL OL ��21-6

21.1.3 21.1.3

POSITIV POSITIVE E CONTROL CONTROL & P-Q CONTROL CONTROL ��21-7

21.1 21.1.4 .4

BOOM BOOM UP CONF CONFLU LUX X CONT CONTRO ROL L ��21-9

21.1.5 21.1.5

ARM IN RECIRCUL RECIRCULATI ATION ON & CONFLU CONFLUX X CONTRO CONTROL L ��21-11

21.1.6 21.1.6

ARM-IN ARM-IN ANTI-CAVI ANTI-CAVITATI TATION ON CONTROL CONTROL ��21-13

21.1.7 21.1.7

ARM-OU ARM-OUT T CONFLUX CONFLUX CONTRO CONTROL L ��21-14

21.1.8 21.1.8

BUCKET BUCKET DIGGIN DIGGING G ANTI-C ANTI-CAVIT AVITATIO ATION N CONTRO CONTROL L ��21-16

21. ［21.

MECH MECHATR ATRO O CONTRO CONTROLLE LLER R］ Issue

Date of Issue

Applicable Machines

First edition

June, 2013

SK210LC-9 : YQ13-10001~

Octo Octobe ber, r, 2013 2013

SK21 SK210L 0LC-9 C-9 : YQ13 YQ13-1 -100 0001 01~ ~

Remarks S5YN2146E01 (NA)

(North (North America America / Europe) Europe)

21. ［21.


PREFACE

This This manua manuall explai explains ns only only those those relate related d to the electr electro o hydrau hydraulic lic conver conversio sion n as mechat mechatro ro control control.. This This manual manual summar summarize izes s the mechat mechatro ro system system and the functi function on of the mechat mechatro ro contro controlle llerr relate related d appara apparatus tuses. es. Regard Regarding ing the condit condition ions s before before and after after each each conver conversio sion, n, refer refer to the hydrau hydraulic lic system system and the electr electric ic system system..

21. ［21.


21.1 1.1

SUMMARY OF OF ME MECHATRO CO CONTROL SY SYSTEM

21.1 21.1.1 .1

MECH MECHAT ATR RO CONT CONTRO ROL L SYST SYSTEM EM IN IN GEN GENERAL ERAL

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21. ［21.

21.1 21.1.2 .2


UNLO UNLOAD AD VALV VALVE E CONT CONTRO ROL L

21.. ［21 21.1 21 .1.3 .3

POSITI SITIVE VE CONT CONTRO ROL L & P-Q P-Q CONTR ONTROL OL

MECH MECHATR ATRO O CONT CONTRO ROLL LLER ER］

21. ［21.


(1) Positiv Positive e control control

1.

On star starti ting ng any any one one of oper operat atio ions ns,, pilo pilott seco second ndar ary y pres pressu sure re swit switch ches es each each spoo spooll and and is inpu inputt to each each low pressur pressure e sensor sensor..

2.

The output output voltage voltage of low pressu pressure re sensor sensor is input to mechatro mechatro control controller ler and the mechatro mechatro contro controlle llerr proces processes ses pilot pilot signal signal and output outputs s comman command d accord according ing to the input input voltag voltage e to each each unload unload pressure pressure proportional proportional valve.

3.

Each Each pump pump propor proportio tional nal valve valve output outputs s pilot pilot second secondary ary pressure pressure accordin according g to the command command output output by mecha mechatro tro controlle controllerr and change changes s the tiltin tilting g angle angle of each each pump pump and contro controls ls the delivery delivery rate. rate.

4.

With With this this operat operation ion,, the deliver delivery y rate rate accord according ing to lever lever manipula manipulated ted moveme movement nt is fed to the actuat actuator, or, and conseq consequen uently tly the workin working g speed speed accord according ing to the lever lever manipu manipulat lated ed moveme movement nt will will be obtained.

(2) (2) P-Q cont contro roll

(1) The output output voltag voltage e of high pressu pressure re sensor provide provided d on each each pump pump line line is input input to mechat mechatro ro contro controlle llerr and the mechat mechatro ro control controller ler proces processes ses pilot pilot signal signal and operat operates es the comman command d accord according ing to the input input voltag voltage e (load (load pressu pressure) re).. (2) The lower value value betwee between n comma command nd values values calcul calculate ated d by positi positive ve contro controll and operated operated value value foun found d by P-Q P-Q cont contro roll {ope {opera rate ted d valu value e foun found d in item item 1)} 1)} is sele select cted ed and and is outp output ut to each each pump pump proportional proportional valve as command command value. value. (3) Each Each pump pump proport proportion ional al valve valve output outputs s pilot pilot second secondary ary pressur pressure e accord according ing to the comman command d output output by mecha mechatro tro controlle controllerr and change changes s tiltin tilting g angle angle of each each pump pump and contro controls ls the deliv delivery ery rate. rate. (4) With With this this operat operation ion,, the delivery delivery rate accord according ing to lever lever manipu manipulat lated ed moveme movement nt is fed to actuat actuator or and conseq consequen uently tly workin working g speed speed will will be obtain obtained ed accord according ing to lever lever moveme movement. nt.

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21.1.4 .1.4

BOOM UP CO CONFL FLU UX CO CONTRO TROL


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(1) On starti starting ng boom boom up operat operation ion,, boom boom up operat operating ing pilot pilot pressu pressure re switch switches es boom boom spool spool and boom boom up conflu conflux x spool spool and is input input to low pressure pressure sensor. sensor. (2) The output output voltag voltage e of low pressure pressure sensor sensor is input input to mechat mechatro ro contro controlle llerr and the mechat mechatro ro contro controlle llerr proces processes ses pilot pilot signal signal and output outputs s comma command nd accord according ing to the input input voltag voltage e to P1 and P2 propor proportio tional nal valves valves and P1 and P2 unload unload propor proportio tional nal valves valves.. (3) Each Each propor proportio tional nal valve valve output outputs s pilot pilot propor proportio tional nal valve valve second secondary ary pressu pressure re accord according ing to the comma command nd output output by mechat mechatro ro contro controlle llerr and change changes s P1 and P2 pump pump delive delivery ry rate rate and switch switches es P1 and P2 unload unload pressu pressure re control control valve. valve. (4) With With origin original al hydraul hydraulic ic pressu pressure re comma command, nd, boom main main spool spool and boom up conflu conflux x spool spool are switch switched, ed, and also also with with the command command by mechat mechatro ro contro controlle ller, r, P1 and P2 pumps pumps and P1 and P2 unload unload valves valves are switch switched ed and conseq consequen uently tly the deliv delivery ery oil on P1 pump pump side side conflu confluxes xes delive delivery ry oil on P2 pump side side during during boom up operat operation ion..

21.. ［21

21.1 21 .1.5 .5

MECH MECHATR ATRO O CONTRO CONTROLL LLER ER］

ARM ARM IN RECI RECIR RCULA CULATI TION ON & CONF CONFLU LUX X CONT CONTRO ROL L

21. ［21.


(1) Recirc Recirculat ulation ion and conflux conflux (Low loading loading))

1.

On starting starting arm-in arm-in operatio operation, n, arm-in arm-in operat operating ing pilot pilot second secondary ary pressure pressure is input input to arm 1 spool, spool, arm 2 spool spool and low pressure pressure sensor. sensor.

2.

The output output voltage voltage of low pressu pressure re sensor sensor is input to mechatro mechatro control controller ler and the mechatro mechatro contro controlle llerr proces processes ses pilot pilot signal signal and output outputs s comma command nd accord according ing to the input input voltag voltage e to P1 and P2 propor proportio tional nal valves valves,, P1 and P2 unload unload propor proportio tional nal valves valves and revers reverse e propor proportio tional nal valve valve for arm-in arm-in 2 spool. In case case of combin combined ed operat operation ion,, the pilot pressure pressure other other than than arm-in arm-in operation operation is input input to low pressu pressure re sensor sensor and the output output voltag voltage e is input input to mechat mechatro ro contro controlle ller. r. And the mechat mechatro ro contro controlle llerr proces processes ses pilot pilot signal signal accord according ing to the combin combined ed operat operation ion and output outputs s comman command, d, which which is differ different ent from from the arm-in arm-in indepe independe ndent nt operat operation ion,, to P1 pump pump propor proportio tional nal valve, valve, P1 unload unload propor proportio tional nal valve valve and revers reverse e propor proportio tional nal valve valve for arm-in arm-in 2 spool. spool.

3.

Primar Primary y pressu pressure re of revers reverse e propor proportio tional nal valve valve for arm-in arm-in 2 spool spool is arm-in arm-in pilot pilot secondary secondary pressure pressure and it switch switches es arm 2 spool spool by propor proportio tional nal secondary secondary pressu pressure re accordi according ng to comma command. nd. (Arm (Arm 2 spool controls recirculation recirculation rate and conflux conflux rate.) The other proportional proportional valves output proportiona proportionall secondary secondary pressure according according to command command from mecha mechatro tro contro controlle ller. r. These These propor proportio tional nal valves valves change change the delive delivery ry rate rate of P1, P2 pump, pump, and switch switch P1, P2 unload unload valve. valve.

4.

The The arm arm 1 spoo spooll is switch switched ed acco accord rdin ing g to origin original al oil pres pressu sure re comm comman and, d, and P1, P1, P2 pump pumps, s, P1, P1, P2 unload unload spools spools and arm 2 spool spool are switched switched according according to the command command output output by mechat mechatro ro contro controlle ller, r, and conseq consequen uently tly the return return oil from the arm cylinder cylinder rod side side is recirc recircula ulated ted in P1 and P2 pumps pumps delive delivery ry oil during during arm operat operation ion..

(2) Recirc Recirculat ulation ion cut

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21.1 21.1.6 .6

ARMARM-IN IN ANTI ANTI-C -CAV AVIT ITAT ATIO ION N CONT CONTRO ROL L


21. ［21.

21.1 21.1.7 .7


ARMARM-OU OUT T CONF CONFLU LUX X CONT CONTRO ROL L

21. ［21.


(1) On starti starting ng arm-ou arm-outt operat operation ion,, arm-ou arm-outt operat operating ing pilot pressure pressure switches switches arm 1 spool spool and arm 2 spool spool and is input input to low pressure pressure sensor. sensor. (2) The output output voltag voltage e of low pressure pressure sensor sensor is input to mechat mechatro ro controlle controllerr and the mecha mechatro tro contro controlle llerr proces processes ses pilot signal signal and outputs outputs comman command d accord according ing to the input voltag voltage e to P1 and P2 propor proportio tional nal valves valves and P1 and P2 unload unload propor proportio tional nal valves valves.. (3) Each Each propor proportio tional nal valve valve output outputs s pilot pilot propor proportio tional nal valve valve second secondary ary pressu pressure re accord according ing to the comman command d output output by mechat mechatro ro contro controlle llerr and change changes s P1 and P2 pump pump delive delivery ry rate rate and switch switches es P1 and P2 unload unload pressu pressure re contro controll valves valves.. (4) With With origin original al hydraulic hydraulic pressure pressure command command,, arm 1 spool spool and arm 2 spool spool are switch switched ed and also with the command output by mechatro controller, P1 and P2 pumps and P1 and P2 unload valves are switched switched,, and conseque consequentl ntly y the delivery delivery oil on P2 pump pump side side conflu confluxes xes delivery delivery oil on P1 pump side during arm-out operation. operation.

21. ［21.

21.1 21.1.8 .8


BUCK BUCKET ET DIGG DIGGIN ING G ANT ANTII-CA CAVI VITA TATIO TION N CON CONTR TROL OL

21. ［21.


(1) On starti starting ng bucket bucket diggin digging g (dump) (dump) operat operation ion,, bucket bucket diggin digging g operat operating ing pilot pilot pressu pressure re switch switches es bucket bucket spool and is input input to low pressure pressure sensor. sensor. (2) The The engine engine speed speed comman command d output output by accel accel potent potentiom iomete eterr is input input to mechat mechatro ro contro controlle ller. r. (3) The output output voltag voltage e of low pressure pressure sensor sensor is input to mechat mechatro ro controlle controllerr and the mecha mechatro tro contro controlle llerr proces processes ses pilot signal signal and outputs outputs comman command d accord according ing to the input voltag voltage e to P1 and P2 pump pump propor proportio tional nal valves valves,, P1 and P2 unload unload propor proportio tional nal valves valves and travel travel straig straight ht propor proportio tional nal valve. (4) Each Each propor proportio tional nal valve valve output outputs s pilot pilot propor proportio tional nal valve valve second secondary ary pressu pressure re accord according ing to the comman command d output output by mechat mechatro ro contro controlle llerr and change changes s P1 and P2 pump pump delive delivery ry rate rate and switch switches es P1 and P2 unload unload valves valves and travel travel straight straight valve valve of contro controll valve. valve. (5) The tandem tandem passage passage is connec connected ted to P2 port because because of the travel travel straigh straightt valve valve switched switched and P1 pump pump delive delivery ry oil conflu confluxes xes P2 pump pump delive delivery ry oil because because of P2 unload unload valve valve switch switched. ed. (6) ATT boost boost solenoi solenoid d valve valve turns the soleno solenoid id valve on accord according ing to the engine engine speed, speed, and output outputs s second secondary ary pressu pressure, re, and actuat actuate e stroke stroke limite limiterr and then then contro controls ls the stroke stroke of bucket bucket spool. spool. The The contro controll of spool spool stroke stroke makes makes the preven preventio tion n of cavita cavitatio tion n possib possible le even even if engine engine speed speed is low and pump pump delive delivery ry rate rate is low. low. (7) When When P1 pump pressure pressure was raised raised at cylind cylinder er stroke end, etc. the solenoid solenoid valve valve is closed closed accord according ing to the pump pressu pressure, re, and when when the pump pressu pressure re is high, high, the boost solenoid solenoid valve does does not work to contro controll the stroke stroke limit limit of bucket bucket spool. spool.

21. ［21.

21.1 21.1.9 .9


SWING WING PRIO PRIORI RITY TY CONT CONTRO ROL L

21. ［21.


(1) During During arm-in arm-in operatio operation, n, arm operati operating ng pilot secondar secondary y pressu pressure re switches switches arm

spool spool and is input

to low pressu pressure re sensor sensor on starti starting ng swing swing operat operation ion (or arm-in arm-in operat operation ion during during swing swing operat operation ion), ), and swing swing operat operation ion pilot second secondary ary pressu pressure re switch switches es swing swing spool spool and is input input to low pressure pressure sensor. (2) The output output voltag voltage e of low pressure pressure sensor sensor is input to mechat mechatro ro controlle controllerr and the mecha mechatro tro contro controlle llerr proces processes ses pilot signal signal and outputs outputs comman command d accord according ing to the input voltag voltage e to P1 and P2 propor proportio tional nal valves valves,, P1 and P2 unload unload pressu pressure re propor proportio tional nal valves valves,, travel travel straig straight ht valve valve and reverse reverse propor proportio tional nal valve valve for arm 2 spool. spool. (3) Each Each propor proportio tional nal valve valve output outputs s pilot pilot propor proportio tional nal valve valve second secondary ary pressu pressure re accord according ing to the comman command d output output by mechat mechatro ro contro controlle llerr and change changes s P1 and P2 pump pump delive delivery ry rate rate and switch switches es P1 and P2 unload unload spool, travel travel straig straight ht spool, spool, arm 2 spool. spool. (4) With With origin original al hydraulic hydraulic pressure pressure command command,, arm 1 spool spool and swing spool spool are switched switched and also also with the command by mechatro controller, P1 and P2 unload spools, travel straight spool and arm arm 2 spoo spooll are are swit switch ched ed enabl enablin ing g for two pump pump flow flow rate rates s to be supp suppli lied ed to the the arm arm cyli cylinde nder r head head side, side, and consequen consequently tly the return return oil on arm cylinder cylinder rod side side is recirc recircula ulated ted into arm cylinder cylinder head side. (5) ion by priori priority, ty, and operat operated ed by the recircul recirculate ated d oil, oil, making making the operat operation ion with minim minimum um speed speed drop possible. possible.

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21.1 21.1.1 .10 0


TRAV TRAVEL EL STR STRAI AIGH GHT T CONT CONTRO ROL L

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(1) Judgme Judgment nt travel straight straight

1.

During During travel travel operatio operation n (right (right and left), left), pilot pressur pressure e switch switches es each spool and is input input to low pressure pressure sensor on carrying carrying out attachment attachment system operation.

2.

Mechat Mechatro ro contro controlle llerr decide decides s as travel travel straight straight on receiv receiving ing the input input accord according ing to the combina combinatio tion n shown shown in the table from the low pressu pressure re sensor sensor and turns turns travel travel straig straight ht signal signal on.

3.

On turning turning travel travel straight straight signal signal on, the follow following ing command commands s are output output to each propor proportio tional nal valve. valve.

(2) Operat Operation ion of each each propor proportion tional al valve valve

(Basic (Basicall ally y attach attachmen mentt operat operation ion is actuat actuated ed by P1 pump pump and travel travel operatio operation n is actuat actuated ed by P2 pump pump in travel straight condition.) condition.) 1.

Travel Travel strai straight ght propo proporti rtiona onall valve valve Output Outputs s switch switching ing pressu pressure re accord according ing to the high high priori priority ty select select pressu pressure re in the attach attachmen mentt system system operating operating (Boom, (Boom, arm, bucket, swing, option) option) pilot pressure during operation. operation.

2.

P1 unloa unload d propor proporti tion onal al valve valve Output Outputs s switch switching ing pressu pressure re accord according ing to the high high priori priority ty select select pressu pressure re in the attach attachmen mentt system system operating operating pilot pressure during during operation. operation.

3.

P2 unloa unload d propor proporti tion onal al valve valve Output Outputs s switch switching ing pressu pressure re accord according ing to the high high priori priority ty select select in the travel travel operat operating ing pilot pilot pressure pressure during during operation. operation.

4.

P1 pump pump prop propor orti tion onal al valve valve Output Outputs s switch switching ing pressu pressure re accord according ing to the high high priori priority ty select select pressu pressure re in the attach attachmen mentt system system operating operating pilot pressure during during operation. operation.

5.

P2 pump pump prop propor orti tion onal al valve valve

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21.1 21.1.1 .11 1


PRES PRESSU SURE RE REL RELEA EASE SE CON CONTR TROL OL

21. ［21.


(1) Change Change mechat mechatro ro control controller ler to "PRESS "PRESSURE URE DRAINING DRAINING MODE" MODE" by operat operating ing switch switch on gauge gauge cluster. For detail detail of changi changing ng mode mode method method,, refer refer to "How "How to switch switch to "Press "Pressure ure release release mode"" mode"" on item item 22.11.1. (2) Once Once mechat mechatro ro contro controlle llerr decide decides s it as pressu pressure re releas release e contro control, l, regard regardles less s of each each input input signal signal (operating (operating pilot, accel potentiometer, potentiometer, etc.) the mechatro mechatro controller; controller; 1. Output Outputs s minim minimum um tilt tilt angle angle comman command d to P1, P2 pump pump propor proportio tional nal valves valves and fixes fixes P1, P2 pump pump to minim minimum um tilt tilt angle. angle. 2. Output Outputs s comman command d of pressu pressure re releas release e and output outputs s comma command nd of pressu pressure re releas release e control control to ECU and fixes fixes engine engine speed speed to pressu pressure re releas release e contro controll speed. speed. 3. Output Outputs s maxim maximum um comman command d to P1 and P2 unload unload valves valves and each each pilot pilot second secondary ary pressu pressure re fixes fixes P1 and P2 unload unload valves valves to the maximum maximum opening. opening. (3) Mechat Mechatro ro contro controlle llerr senses senses output output voltage voltage from from the main main pump pump high high pressu pressure re sensor sensor,, decide decides s the pump pump pressu pressure re and displa displays ys "DRAIN "DRAINING ING HYD. HYD. PRESS" PRESS" or "FAIL "FAIL DRAIN DRAIN HYD. HYD. PRESS" PRESS" on gauge gauge cluster. (4) Each Each pump pump delive delivery ry oil is unload unloaded ed to tank tank passag passage e enabli enabling ng for the remain remained ed pressu pressure re (trapp (trapped ed pressu pressure) re) to be releas released ed by operat operating ing each contro controll lever lever and switch switching ing spool spool with with the unload valve opened.

21. ［21. 21.1 21.1.1 .12 2

MECH MECHAT ATRO RO CONTR CONTROL OLLE LER R］ N&B N&B SWIT SWITCH CH CON CONTR TROL OL (OPT (OPTIO ION) N)

21. ［21.


(1) Nibble Nibblerr circuit circuit

1.

Select Select nibble nibblerr mode throug through h select select switch. switch.

2.

Nibb Nibble lerr disp displa lay y appe appear ars s on gauge gauge clus cluster ter..

3.

The The retu return rn oil oil from from the nibb nibble lerr pass passes es throug through h sele select ctor or valv valve e and and opti option on spoo spooll and and led led to tank tank line line of main main contro controll valve. valve.

4.

When When select selecting ing nibbler nibbler mode through through select select switch, switch, the breake breakerr pressu pressure re sensor has not functi function on to output. output. It is in normal when there is no output from sensor in nibbler mode, and in cases of other than above, above, error error displa display y is output output to gauge gauge cluste cluster. r.

(2) Breake Breakerr circuit circuit

1.

Select Select breake breakerr mode throug through h select select switch. switch.

2.

Brea Breake kerr disp displa lay y appear appears s on gauge gauge clus cluste ter. r.

3.

The The return return oil from the breake breakerr passes passes through through selecto selectorr valve valve and direct directly ly returns returns into hydraulic hydraulic oil tank.

4.

When When select selecting ing breaker breaker mode mode throug through h select select switch, switch, the breaker breaker pressu pressure re sensor sensor outputs outputs signal signal.. It is in normal when there is an output from sensor in breaker mode, and in cases of other than above, above, error error displa display y is output output to gauge gauge cluste cluster. r.

21. ［21. 21.1 21.1.1 .13 3

MECH MECHAT ATRO RO CONTR CONTROL OLLE LER R］ OPTIO OPTION N CONF CONFLUX LUX CONT CONTRO ROL L (OPT (OPTIO ION) N)

21. ［21.


(1) Using Using "OPTIO "OPTION N SETTIN SETTING" G" displa display y locate located d on "USER "USER MENU" screen, screen, the flow rate rate is adjust adjusted. ed. At this this time, time, if the setting setting flow flow rate rate is larger larger than one pump flow flow rate, rate, the flow become becomes s autom automati atical cally ly confluent confluent flow. (2) On starti starting ng option option operatio operation, n, option option operatin operating g pilot pilot pressu pressure re switch switches es option option spool and is input input to low pressure pressure sensor. sensor. (3) The output output voltag voltage e of low pressure pressure sensor sensor is input to mechat mechatro ro controlle controllerr and the mecha mechatro tro contro controlle llerr proces processes ses pilot signal signal and outputs outputs comman command d accord according ing to the input voltag voltage e to P1 and P2 pump pump propor proportio tional nal valves valves,, P1 and P2 unload unload pressu pressure re propor proportio tional nal valves valves and travel travel straig straight ht proportional proportional valve. valve. (4) Each Each propor proportio tional nal valves valves output output pilot pilot propor proportio tional nal valve valve second secondary ary pressu pressure re accord according ing to the comman command d output output by mechat mechatro ro contro controlle llerr and change changes s P1 and P2 pump pump delive delivery ry rate rate and switch switches es P1 and P2 unload unload valves valves and travel travel straig straight ht valve valve of the control control valve. valve. (5) (5) The The para parall llel el pass passag age e on P2 side side is conn connec ecte ted d to P1 port port beca becaus use e of the the trav travel el stra straig ight ht valv valve e switch switched ed and P1 pump pump delive delivery ry oil confluxe confluxes s P2 pump pump delive delivery ry oil because because of the P2 unload unload valve switched.

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21. 21.2

MEC MECHATRO CONTROLLER

21.2.1 .2.1

SUMMARY OF OF MU MULT LTII DIS DISP PLAY LAY

Electr Electro-h o-hydr ydraul aulic ic conver conversio sion n inform informati ation on is displa displayed yed on the multi multi displa display y of the gauge gauge cluste cluster. r. (1) (1) Contr Control ols s

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(3) (3) Scre Screen en sele select ction ion by work work mode mode sele select ct swit switch ch

The mode after the engine engine starting starting is always always the start start from "S" mode. mode. The work mode is switch switched ed in order of "S" to "E" to "H" to "S" each time the work mode select switch is pressed. Select Select proper proper work work mode mode shown shown below below accordi according ng to the work condit condition ion and the purpose. purpose. For the select selected ed work work mode, mode, refer refer to the upper left corner corner of displa display. y. ・

・

S mode: mode: For For standa standard rd excava excavatin ting g work work ECO mode: mode: For low fuel fuel consum consumpti ption on excavating excavating work

・

H mode: mode: For heavy heavy duty excavati excavating ng work

S mode mode

"S mode" mode" is suitab suitable le for standa standard rd diggin digging g and

21. ［21.


(5) Screen Screen selection selection by attachm attachment ent mode switic switich h

This This switch switch is used used for switch switching ing the attach attachme ment nt mode. Attachment mode display Press Press Diggin Digging g mode mode switch switch (1) to select select Diggin Digging g mode mode from attach attachme ment nt modes. modes. And select selected ed Digging Digging mode is indicated.P indicated.Press ress Nibbler Nibbler mode switch switch (2) to select select Nibble Nibblerr mode mode from from attachment attachment modes. And selected selected Nibbler mode is indica indicated ted.Pr .Press ess Breake Breakerr mode mode switch switch (3) to select select Breaker Breaker mode from attachment attachment modes. And selected Breaker mode is indicated. Depending Depending on the attachment attachment employed, employed, select the applicable applicable mode from "Digging", "Digging", "Nibbler" "Nibbler" and "Breaker". "Breaker". Before Before the working, working, confirm whether whether appropriate appropriate attachment attachment had been selected. selected. 1. Diggin Digging g mode mode switch switch 2. Nibble Nibblerr mode mode switch switch 3. Breake Breakerr mode mode switch switch

21. ［21.


(6) (6) Proc Proced edur ure e of setti setting ng a flow flow rate rate and and a optio option n reli relief ef pres pressu sure re at Nibbl Nibbler er/B /Bre reak aker er mode mode

1: Buzzer Buzzer Stop Stop Switch Switch 2: Menu Menu Switch Switch 3: Nibble Nibblerr Mode Mode Switch Switch 4: Breake Breakerr Mode Mode Switch Switch 5: Up Arrow Arrow Switch Switch 6: Down Down Arrow Arrow Switch Switch 7: Next Next Arrow Arrow Switch Switch 8: Back Back Arrow Arrow Switch Switch

According to some kind of attachment, it is required to change the flow rate and relief pressure for service service circuit. circuit. Regard Regarding ing the adjust adjustme ment nt of flow flow rate rate and relief relief pressure pressure for Nibble Nibblerr and Breaker, Breaker, the settin settings gs of 10 patterns patterns are available. available.

21. ［21.


1)

When When usi using ng Nib Nibbl bler er

1.

Turn Turn starte starterr switch switch ON. After After pressi pressing ng Nibbler Nibbler mode switch switch (3) to select select Nibbler Nibbler mode, mode, turn

21. ［21.


2)

When When usin using g Brea Breake ker r

1.

Turn Turn starte starterr switch switch ON. After After pressi pressing ng Breaker Breaker mode switch switch (4) to select select Breaker Breaker mode, mode, turn

21. ［21.


(7) Pump Pump flow rate adjustm adjustment ent (Nibbler (Nibbler mode / Breake Breakerr mode) mode) (Option (Option))

1: Screen Screen Change Change Switch Switch 2: Buzzer Buzzer Stop Stop Switch Switch 3: Work Work Mode Mode Select Select Switch Switch 4: Washer Washer Switch Switch 5: Wiper Wiper Switch Switch 6: Travel Travel Speed Speed Select Select Switch Switch 7: Auto Auto Accel Accel Switch Switch 8: Menu Menu Switch Switch 9: Attach Attachmen mentt Mode Mode Select Select Switch Switch 10: Arrow Arrow Switch Switch

21. ［21.

(8) Mainten Maintenance ance screen screen display displays s

This This screen screen displa displays ys the remain remaining ing time to the end of recommend recommended ed replacemen replacement/chan t/change ge interval interval specified specified for filter/oil filter/oil..

After turning starter key switch ON or starting engine engine,, Then, Then, the displa display y return returns s to "SERVI "SERVICE CE ADJUST 1-2" screen (c). This display shows the recommende recommended d replac replaceme ement nt time time of engine engine oil, oil, time time for next next engine engine oil change change and date date of previo previous us engine engine oil change. change.


21. ［21.


2. Remain Remaining ing time time displa display y to the coming coming fuel fuel filter filter replacement This This displa display y shows shows the remain remaining ing time time of "INTERVAL, "INTERVAL, REMAINING REMAINING TIME, TIME, EXCHANGE EXCHANGE DAY". 3. Remain Remaining ing time time displa display y to the coming coming hydrau hydraulic lic oil filter replacemen replacementt This This displa display y shows shows the remain remaining ing time time of "INTERVAL, "INTERVAL, REMAINING REMAINING TIME, TIME, EXCHANGE EXCHANGE DAY". 4. Remain Remaining ing time time displa display y to the coming coming hydrau hydraulic lic oil change change This This displa display y shows shows the remain remaining ing time time of "INTERVAL, "INTERVAL, REMAINING REMAINING TIME, TIME, EXCHANGE EXCHANGE DAY".

21. ［21.

(9) Consum Consumptio ption n

1: Screen Screen Change Change Switch Switch 2: Buzzer Buzzer Stop Stop Switch Switch 3: Work Work Mode Mode Select Select Switch Switch 4: Washer Washer Switch Switch 5: Wiper Wiper Switch Switch 6: Travel Travel Speed Speed Select Select Switch Switch 7: Auto Auto Accel Accel Switch Switch 8: Menu Menu Switch Switch 9: Arrow Arrow Switch Switch


21. ［21.


(10) Gauge cluster cluster display display

After key is switched on and logo mark display disappears, screen for operator is displayed on multi screen screen.. The displa display y functi functions ons of multi multi displa display y are explai explained ned below. below.

1.

Disp Displa lay y functio function n for for operato operator: r:

Screen Screen usually usually displayed displayed during operation 1.1 Clock display function: Current Current time is displayed. displayed. 1.2 Self-diagn Self-diagnosis osis display : When When abnorm abnormali ality ty is detect detected ed on mechat mechatro ro system system like like sensor sensor,, propor proportio tional nal valve, valve, etc., etc., this this displa displays ys error code. 1.3 Warning Warning display: display: When When machin machine e was thrown thrown into into danger dangerous ous state, state, or was failed failed,, displa displays ys warnin warning g conten contents ts with with the symbol symbol and statement. statement.

21. ［21.


Error Error codes codes were were stored stored as troubl trouble e histor history, y, and displa displayed yed on the monito monitorr by the trouble trouble histor history y displa display y function. 1.4 Machi Machine ne condit condition ion displa display y : Displays Displays machine machine operating operating condition. condition. 2.

Disp Display lay funct function ion for maint maintena enanc nce: e:

Displays Displays remaining remaining time up to replacement replacement/chan /change ge of following following items. (1) Engine Engine oil (2) Fuel Fuel filter filter (3) Hydrau Hydraulic lic oil filter filter (4) Hydrau Hydraulic lic oil 3.

Failu Failure re histo history ry displ display ay functio function: n:

Stores Stores abnorm abnormali ality ty occurr occurred ed on mecha mechatro tro system system in the past past and displa displays ys in order order of recent recent occurr occurrenc ence. e. 4.

Mechatr Mechatro o adjust adjustmen mentt displa display: y:

Displays Displays procedure procedure for adjustmen adjustmentt of mechatro mechatro system system like output adjustmen adjustmentt and unload unload adjustment adjustment,, etc. 5.

Serv Servic ice e diagno diagnosi sis s displa display y :

Displa Displays ys inform informati ation on like like pressu pressure re sensor sensor sensed sensed value, value, propor proportio tional nal valve valve comma command, nd, etc. etc. output output by mechatro mechatro controller controller

21. ［21.


(11) Rearview Rearview camera camera 1)

Setti Setting ng of disp displa lay y pictu picture re of rear rearvie view w came camera ra

1: Buzzer Buzzer Stop Stop Switch Switch 2: Menu Menu Switch Switch 3: Up Arrow Arrow Switch Switch 4: Down Down Arrow Arrow Switch Switch 5: Next Next Arrow Arrow Switch Switch 6: Back Back Arrow Arrow Switch Switch

21. ［21.


2)

Troubl Troublesho eshootin oting g

1.

Gaug Gauge e clus cluste terr is powere powered d on but pict pictur ure e does does not appea appearr and and it shows shows blue blue screen screen..

No.

1

Parts Power-s Power-supp upply ly box to Cab harness

Parts/Normal condition

Corrective action

Make sure that connector connector between power-s power-supp upply ly box and cab harnes harness s is

Check connections connections..

connected.

2

Cab Cable to Cab Cab harnes ness

3

Cab Cable to Cam Camera cable

4

Fuse & Relay box

Make Make sure sure that that connec connector tor between between cable cable and cab harnes harness s is connec connected ted.. Make Make sure sure that that connec connector tor between between cable cable and camera camera cable cable should should is connec connected ted.. Make Make sure sure that that No. 30 fuse (5A) did not not melt down.



Replace fuse.

Make Make sure sure that that CAMERA CAMERA 1 SETTIN SETTING G in 5

Setting of cam camera

SERVICE SERVICE ADJUSTMENT1 ADJUSTMENT1-2 -2 screen is ON, and and CAME CAMERA RA 2 and and CAME CAMERA RA 3

Check the setting. setting.

SETTING SETTING are OFF.

2.

Gaug Gauge e clus cluste terr is powere powered d on but but pict pictur ure e does does not not appea appearr and and it shows shows fuel fuel cons consum umpt ptio ion n grap graph h or logo.

No.

Parts

Parts/Normal condition Make Make sure sure that that CAMERA CAMERA 1 SETTIN SETTING G in SERVICE SERVICE ADJUSTMENT1 ADJUSTMENT1-2 -2 screen is ON,

Corrective action

21. ［21.


21.2 21.2.2 .2

SELF SELF DIAG DIAGNO NOSI SIS S DISPL ISPLAY AY

(1) (1) Outli Outline ne

This This functi function on identi identifie fies s abnorm abnormali ality ty of control control I/O signal signal like like pressu pressure, re, propor proportio tional nal valve, valve, etc. etc. during during machin machine e operat operation ion throug through h self self diagno diagnosis sis.. The failed failed items items are displa displayed yed on multi multi displa display y of gauge gauge cluste cluster. r. For connec connector tor No. and pin No., No., refer refer to the sectio section n "C-1 "C-1 Mechat Mechatro ro contro controlle ller" r" explai explained ned later. later. Electr Electric ic circui circuitt diagra diagram m or harnes harness s is availa available ble to identi identify fy wire wire No. and wire wire color. color. (2) I/O configu configurat ration ion

(3) Self diagno diagnosis sis display display items items

As-displayed clock (Usually main screen). When error occurred, specifies failed section and the failure type type with with the the aid aid of erro errorr code code..

21. ［21.


21. ［21.


21. ［21.

21.2 21.2.3 .3


SERV SERVIC ICE E DIAG DIAGNO NOSI SIS S DISP DISPLA LAY Y FUNC FUNCTI TION ON

The curren currentt servic service e diagno diagnosis sis is displa displayed yed on multi multi displa display y based based on the data data receiv received ed from from mechat mechatro ro contro controlle ller. r. This This sectio section n explai explains ns the operat operating ing proced procedure ure and exampl examples es of each each screen screen.. The The values values in displa display y change changes s accord according ing to the condit condition ions s like like engine engine speed, speed, attach attachmen mentt positi position, on, etc. etc. (1) Servic Service e diagnos diagnosis is display display screen operating operating proced procedure ure

1. Turn Turn starte starterr switch switch ON keepin keeping g buzzer buzzer stop stop switch switch presse pressed. d. Buzzer Buzzer stop switch switch

2. After After logo logo mark mark is displa displayed yed,, the screen screen change changes s in servic service e diagno diagnosis sis mode. The servic service e diagno diagnosis sis screen screen "Mode "Mode No.1", No.1", "Scree "Screen n No.1" No.1" is displa displayed yed first. first. The service service diagno diagnosis sis is classi classifie fied d into into three three modes, modes, 1, 2, and 3, and the presen presentt mode mode is displa displayed yed in "Screen "Screen No.1". No.1". The screen screen number number each mode mode can display display differ differs. s. The screen screen number number displaye displayed d by each each mode mode is as follows. ・

・

・

Mode Mode No.1 : Scre Screen en No.1 to No.2 No.22 2 Mode Mode No.2 No.2 : Screen Screen No.1, No.1, Screen Screen No.23 to No.27 No.27 Mode Mode No.3 No.3 : Screen Screen No.1, No.1, Screen Screen No.27 to No.31 No.31

21. ［21.


(2) Servic Service e diagnos diagnosis is display display screen screen (Examp (Example) le)

The service service diagno diagnosis sis display display screen screen list list is shown shown below. below. The condit condition ions s for displa display y are H mode, mode, engine engine low speed speed and lever lever to neutral neutral position. position.)) 1)

Serv Servic ice e diagno diagnosi sis s mode No.1 No.1

21. ［21.


21. ［21.


21. ［21.

2)

Serv Servic ice e diagno diagnosi sis s mode mode No.2


21. ［21.


(3) Servic Service e diagno diagnosis sis data list

Preface Preface and precaution precaution The followin following g is the data data decide decided d as normal normal status status after after servic service e diagno diagnosis sis for every operat operation ion.. Use these data to decide decide normal/abn normal/abnormal ormal status. ・

・

The values values in follow following ing displa display y are refere reference nce values values with with standa standard rd attach attachmen mentt attach attached ed machi machine. ne. The value of pressu pressure re sensor sensor is calcul calculate ated d taking taking variat variation ion into accoun accounts. ts. When When compar compared ed to perfor performan mance ce check check refere reference nce criter criteria, ia, measur measure e it with with the aid of calibr calibrate ated d measur measuring ing instru instrumen ment. t.

・

The current current of proporti proportiona onall valve valve is not the measur measured ed value, value, but comman command d value. value. The measur measured ed value value should should be confir confirmed med by the value value in the displa displayed yed value value for each propor proportio tional nal valve. valve.

・

The current current value value of pump pump propor proportio tional nal valve is refere reference nce value because because it varies varies according according to pump pump pressu pressure re and adjust adjusted ed torque torque value. value.

・

The value value in display display during during operatio operation n shows shows the value value in steady steady state, state, rather rather than, at start start of operation.

・

・

Check Check on machin machine e after after suffic sufficien iently tly warmin warming g up machin machine. e. The value in displa display y may differ differ accord according ing to softwa software re versio version. n. Contac Contactt our dealer dealer/di /distr stribu ibutor tor..

Operation Operation No.1: No operation operation

Operation Operation No.2: No operation operation

H mode Hi idle

S mode Hi idle

No.24 ARM, SWING

No.24 ARM, SWING

C-1

P1-PRES

0.2 to 1.5 M

C-1

P1-PRES

0.2 to 1.5 M

C-2

P2-PRES

0.2 to 1.5 M

C-2

P2-PRES

0.2 to 1.5 M

E-1

P1-PSV

350 mA

E-1

P1-PSV

350 mA

E-2

P2-PSV

350 mA

E-2

P2-PSV

350 mA

21. ［21.


Operation Operation No.5: Boom Boom down in full lever operation operation & in operat operation ion H mode Hi idle No.23 BOOM C-1

P1-PRES

12.5 12.5 to 16.0 16.0 M

C-2

P2-PRES

0.2 to 1.5 M

E-1

P1-PSV

600 to 617 mA

E-2

P2-PSV

350 mA

D-1

P1-UL(BPC)

427 to 477 mA

D-2

P2-UL(BPC)

750 mA

B-1

BOOM RAISE

0.0 M

B-2

BOOM LOWER LOWER

3.0 M

G-3

ENG SPEED SPEED

1970 1970 to 2030 2030

POWER POWER SHIFT

0 mA

Operation Operation No.6:


Arm-in in full lever operation & relief

Arm-in in full lever operation & in operation

H mode Hi idle

H mode Hi idle

No.24 ARM, SWING

No.24 ARM, SWING

C-1

P1-PRES

33.0 33.0 to 35.8 35.8 M

C-1

P1-PRES

12.5 to 16.5 M

C-2

P2-PRES

33.0 33.0 to 35.8 35.8 M

C-2

P2-PRES

12.5 to 16.5 M

E-1

P1-PSV

415 to 525 mA

E-1

P1-PSV

550 to 750 mA

E-2

P2-PSV

415 to 525 mA

E-2

P2-PSV

550 to 750 mA

D-1

P1-UL(BPC)

360 mA

D-1

P1-UL(BPC)

360 mA

21. ［21.




Arm-out in full lever operation & relief

Arm-out in full lever operation & in operation

H mode Hi idle

H mode Hi idle

No.24 ARM, SWING

No.24 ARM, SWING

C-1

P1-PRES

33.0 to 35.8 M

C-1

P1-PRES

15.0 to 22.0 M

C-2

P2-PRES

33.0 to 35.8 M

C-2

P2-PRES

15.0 to 22.0 M

E-1

P1-PSV

415 to 525 mA

E-1

P1-PSV

488 to 677 mA

E-2

P2-PSV

415 to 525 mA

E-2

P2-PSV

488 to 677 mA

D-1

P1-UL(BPC)

360 mA

D-1

P1-UL(BPC)

360 mA

D-2

P2-UL(BPC)

360 mA

D-2

P2-UL(BPC)

360 mA

D-3

S-TRAVEL

350 mA

D-3

S-TRAVEL

350 mA

D-6

ARM-IN-2

750 mA

D-6

ARM-IN-2

750 mA

B-3

ARM OUT

3.0 M

B-3

ARM OUT

3.0 M

B-4

ARM IN

0.0 M

B-4

ARM IN

0.0 M

B-1

BOOM BOOM RAISE

0.0 M

B-1

BOOM BOOM RAISE

0.0 M

B-7

SWING

0.0 M

B-7

SWING

0.0 M

G-3

ENG SPEED SPEED

1970 to 2030

G-3

ENG SPEED SPEED

1970 to 2030

POWER POWE R SHIFT SHIFT

0 mA

POWER POWE R SHIFT

0 mA

* Meas Measur ure e the the valu values es afte afterr a laps lapse e of 5 minu minute tes s or afte afterr rele releas ase e of low low temp temper erat atur ure e mode mode

Operation Operation No.10: No.10:


Swing Swing in full lever lever operat operation ion & relief relief

Swing Swing in full full lever lever opera operation tion & in operat operation ion

H mode Hi idle

H mode Hi idle

No 24 ARM SWING

No 24 ARM SWING

21. ［21.




Bucket Bucket diggin digging g in full full lever lever operat operation ion & relief relief

Bucket Bucket diggin digging g in full full lever lever operat operation ion & in operat operation ion

H mode Hi idle

H mode Hi idle

No.25 BUCKET

No.25 BUCKET

C-1

P1-PRES

33.0 to 35.8 M

C-1

P1-PRES

4.0 to 8.0 M

C-2

P2-PRES

0.2 to 1.5 M

C-2

P2-PRES

0.2 to 1.5 M

E-1

P1-PSV

525 to 650 mA

E-1

P1-PSV

750 mA

E-2

P2-PSV

350 mA

E-2

P2-PSV

350 mA

D-1

P1-UL(BPC)

360 mA

D-1

P1-UL(BPC)

360 mA

D-2

P2-UL(BPC)

750 mA

D-2

P2-UL(BPC)

750 mA

D-3

S-TRAVEL

350 mA

D-3

S-TRAVEL

350 mA

B-5

BUCKET BUCKET DIG

3.0 M

B-5

BUCKET BUCKET DIG

3.0 M

B-6

BUCKET BUCKET DUMP

0.0 M

B-6

BUCKET BUCKET DUMP

0.0 M

G-3

ENG SPEED SPEED

1970 to 2030

G-3

ENG SPEED SPEED

1970 1970 to 2030 2030

POWER POWE R SHIFT

0 mA

POWER POW ER SHIFT

0 mA



Bucket Bucket dump in full full lever lever operat operation ion & relief relief

Bucket Bucket dump in full lever operation operation & in operat operation ion

H mode Hi idle

H mode Hi idle

No.25 BUCKET

No.25 BUCKET

C-1

P1-PRES

33.0 to 35.8 M

C-1

P1-PRES

6.0 to 15.0 M

C-2

P2-PRES

0.2 to 1.5 M

C-2

P2-PRES

0.2 to 1.5 M

E-1

P1-PSV

435 to 550 mA

E-1

P1-PSV

625 to 750 mA

E-2

P2-PSV

350 mA

E-2

P2-PSV

350 to 750 mA

21. ［21.




P2 side side option option in full full lever lever operat operation ion & relief relief

P2 side side option option in full full lever lever operat operation ion & relief relief

A mode Hi idle

B mode Hi idle

No.27 OPT

No.27 OPT

C-1

P1-PRES

22.5 to 26.0 M

C-1

P1-PRES

0.2 to 1.5 M

C-2

P2-PRES

22.5 to 26.0 M

C-2

P2-PRES

22.5 to 26.0 M

E-1

P1-PSV

459 to 584 mA

E-1

P1-PSV

500 mA

E-2

P2-PSV

459 to 584 mA

E-2

P2-PSV

665 to 750 mA

D-1

P1-UL(BPC)

360 mA

D-1

P1-UL(BPC)

750 mA

D-2

P2-UL(BPC)

360 mA

D-2

P2-UL(BPC)

360 mA

D-3

S-TRAVEL

720 mA

D-3

S-TRAVEL

350 mA

E-3

OPT RELIEF RELIEF

0 mA

E-3

OPT RELIEF RELIEF

0 mA

B-16

P1 OPT

0.0 M

B-16

P1 OPT

0.0 M

B-17

P2 OPT

2.0 to 2.6 M

B-17

P2 OPT

2.0 to 2.6 M

OPT SELECT SELECT

NIB

OPT SELECT SELECT

BRK

DOUBLE DOUBLE FLOW FLOW SW.

---

DOUBLE DOUBLE FLOW SW.

---

ENG SPEED SPEED

1970 to 2030

ENG SPEED SPEED

1970 to 2030

POWER POWE R SHIFT SHIFT

0 mA

POWER POWE R SHIFT

0 mA

F-4 G-3

F-4 G-3

* Conflu Conflux x switch switch is ON. Relief Relief set pressure pressure is

* Conflu Conflux x switch switch is OFF. OFF. Relief Relief set pressu pressure re is

value of shipping. shipping.

value of shipping. shipping.


Operation Operation No.19 :

Travel Travel right right in full full lever lever operat operation ion & travel travel idling idling

Travel Travel left left in full lever operat operation ion & travel travel idling idling

H mode Hi idle

H mode Hi idle

21. ［21.

21.2 21.2.4 .4


TROU TROUB BLE HIST HISTOR ORY Y DIA DIAGNOS GNOSIS IS

The items items of error error detect detected ed by mechat mechatro ro contro controlle llerr self self diagno diagnosis sis functi function on are stored stored in mechat mechatro ro contro controlle llerr as one of histor history. y. And the errors errors are able able to be indica indicated ted on the multi display display.. The warnin warning g conten contentt is record record partia partially lly in "Trave "Travell histor history y screen screen". ". The error code for self diagno diagnosis sis is stored stored.. (1) (1) How How to displ display ay

1.

Turn Turn the the starte starterr key switc switch h ON while while pressi pressing ng buzzer buzzer stop stop switch switch (1). (1). The service service diagnosis diagnosis screen (a) appears.

2.

Duri During ng pressi pressing ng buzzer buzzer stop switc switch h (1), (1), press press menu menu switch switch (2) three three times. times. "TROUBLE "TROUBLE HISTORY" HISTORY" appears on SERVICE SERVICE MENU screen (b).

3.

Usin Using g "UP" arro arrow w switc switch h (3) or "DOW "DOWN" N" arrow arrow switch switch (4), move move the cursor to "TROUB "TROUBLE LE HISTOR HISTORY" Y" in screen screen (b). (b). Press Press "NEXT "NEXT"" arrow arrow switch switch (5) to displa display y troubl trouble e history history screen (c).

4.

Tran Transm smit it the data data of troub trouble le histo history ry (one (one or many) and hour meter to the gauge cluster. -The -The data data of hour hour mete meterr and and 10 fail failur ures es are are

21. ［21.

21.2 21.2.5 .5


SET SET PROC PROCED EDUR URE E OF OF MAI MAINT NTEN ENAN ANCE CE SCHE SCHEDU DULE LE

This machine is equipped equipped with multi-display multi-display which makes confirmation of remaining time to the coming coming replacemen replacement/cha t/change nge time of engine oil, oil, fuel fuel filter filter,, hydrau hydraulic lic oil filter filter and hydrau hydraulic lic oil. oil. When When the remainin remaining g time time reache reaches s to Zero Zero (0), (0), replac replace e or change change them and perform perform the initia initiall settin setting g in the follow following ing order. order.

Interv Interval al of replac replacem ement ent of parts parts is menti mentione oned d below. below. -Engin -Engine e oil: oil: 500 Hr -Fuel -Fuel filter filter:: 500 Hr -Hydraulic -Hydraulic filter: 1,000 Hr -Hydra -Hydrauli ulic c oil: oil: 5,000 5,000 Hr

21. ［21.


21. ［21.

21.2 21.2.6 .6


ADJU ADJUS STIN TING PRO PROCE CEDU DURE RE OF DIS DISPL PLAY AY

(1) (1) For oper operato ator r 1)

Auto uto Idle Idle Sto Stop p

1: Screen Screen Change Change Switch Switch 2: Buzzer Buzzer Stop Stop Switch Switch 3: Work Work Mode Mode Select Select Switch Switch 4: Washer Washer Switch Switch 5: Wiper Wiper Switch Switch 6: Travel Travel Speed Speed Select Select Switch Switch 7: Auto Acceleration Acceleration Switch 8: Menu Menu Switch Switch 9: Arrow Arrow Switch Switch

21. ［21.

2)

Cloc Clock k Adjust Adjustmen mentt Switch Switches es



21. ［21.

3)


Contra Contrast st Adjus Adjustme tment nt Switch Switches es


21. ［21.

4)

Brightn Brightness ess (Day (Day)) Adjust Adjustment ment



21. ［21.

5)


Brightn Brightness ess (Nig (Night) ht) Adjust Adjustmen ment t


21. ［21.


(2) (2) Funct Function ion for servi service ce

Follow Following ing items items are provide provided d for adjust adjustmen mentt of servic service e functi function. on.

Item

CONTENTS

Language

Language selection

Rise-up wiper

Wiper control change (When cab is changed)

Idle stop

ON/OFF of auto idle stop (ON/OFF of adjustment for user) and time adjust

P1 option option pressure pressure sensor sensor

ON/OFF ON/OFF of self diagnosis diagnosis for P1 option option pressur pressure e sensor sensor

P2 option option pressure pressure sensor sensor

ON/OFF ON/OFF of self diagnosis diagnosis for P2 option option pressur pressure e sensor sensor

Swing alarm

ON/OFF of swing alarm (ON/OFF of adjustment for user)

Left Left pedal pedal for rotation rotation of

Does Does left left rotati rotation on pedal pedal use? use?

option attachment attachment

(Unloa (Unload d valve valve does does not not actuat actuate e becaus because e P4 pump pump is equipp equipped ed in EU.) EU.)

Setting Setting of optional optional

Optional Optional flow rate limitation, limitation, relief relief pressure pressure limitation, limitation, combination combination of return return selector selector

equipment

adjustment.

Engine speed

ON/OFF of engine rpm display

Auto acceleration

Adjustment the type of the engine speed of auto deceleration runs up abruptly.

Chan Change ge of star starte terr mod mode e

Chan Change ge of star startt mod mode e

Low temperatur temperature e mode

Low temperatur temperature e mode release

forcible forcible release release Pressure release

For pressure release

Cam Camera 1 set setting

ON/ ON/OFF of rearview camera 1 display

Cam Camera 2 set setting

ON/ ON/OFF of rearview camera 2 display

21.. ［21 21.2 21 .2.7 .7

MECH MECHAT ATRO RO CONTR CONTROL OLLE LER R］ MECH MECHAT ATRO RO CONT CONTRO ROL L EQUI EQUIPM PMEN ENT T

(1) C-1 Mechatro Mechatro control controller ler 1)

Outs Outsid ide e vie view w

2)

List List of con conne nect ctor ors s

21. ［21.


21. ［21.


21. ［21.


21. ［21.


21. ［21.


(2) Gauge Gauge cluster cluster (symbol (symbol C-2) 1)

Gene Genera rall vie view w

2)

Conn Connect ector or CN-60 CN-600 0 (Har (Harne ness ss side) side)

No

Item name

Wire color

No

Item name

Wire color

21. ［21.

5)


Summ Summar ary y of disp displa lay y and drive drive item item

No. 1

Item Monitar display

LCD dot 120X168

2

-

3

-

4

Buzzer

5

Scre Screen en chan change ge swit switch ch

6

Buzz Buzzer er stop stop swit switch ch

7

Work Work mod mode e sele select ct swi switc tch h

8

Digg Diggin ing g mode mode swit switch ch

9

Nibb Nibble lerr mod mode e swit switch ch

10

Brea Breake kerr mode mode swi switc tch h

11

Up arro arrow w swi switc tch h

12

Down Down arr arrow ow swi switc tch h

13

Next Next arr arrow ow swi switc tch h

14

Back Back arr arrow ow swi switc tch h

15

Back light

Remarks

Piezo-electricity type

LED

21. ［21.

(3) (3) Rela Relay y & fuse fuse box (symbo (symboll E-1) 1)

Gene Genera rall vie view w


21. ［21.

2)


Circ Circuit uit diagr diagram am

21. ［21.


21. ［21.


21. ［21.

(4) High High pressu pressure re sensor sensor:: LS52S0 LS52S0001 0015P1 5P1

(5) Low pressure pressure sensor: sensor: LC52S0 LC52S0001 0019P1 9P1


21. ［21.


22. ［22.

22.

HYDR HYDRAU AULIC LIC SYS SYSTEM TEM］

HYDRAULIC SYS SYSTEM T AB LE OF CONTENTS

22 22.1 .1

SUMM SUMMAR ARY Y

22.2 22. 2

HYDRAU HYDRAULIC LIC CIRCUIT CIRCUITS S AND AND COMPO COMPONEN NENTS TS

22.3 22. 3

COLOR COLOR CODIN CODING G STANDA STANDARD RD FOR HYDRAUL HYDRAULIC IC CIRCUI CIRCUITS TS

22.4 22. 4

NEUTRA NEUTRAL L CIRCU CIRCUIT IT

22 22.5 .5

TRAV TRAVEL EL CIRCU CIRCUIT IT

22 22.6 .6

BUCK BUCKET ET CIRCU CIRCUIT IT

22 22.7 .7

BOOM BOOM CIR CIRCU CUIT IT

22 22.8 .8

SWING SWING CIR CIRCU CUIT IT

22 22.9 .9

ARM ARM CIRC CIRCUI UIT T

………………………………………………………………………………………………………

……………………………………………………………

…………………………………………

……………………………………………………………………………………………

22-3 22-4 22-8 228 22-8 22-8

………………………………………………………………………………………………

22-10 22-10

………………………………………………………………………………………………

22-12 22-12

…………………………………………………………………………………………………

22-14 22-1 4

………………………………………………………………………………………………

22-18 22-18

…………………………………………………………………………………………………

22-20 22-20

22. ［22.

HYDR HYDRAU AULI LIC C SYSTE SYSTEM M］ Issue

Date of Issue

Applicable Machines

First edition

June, 2013

SK210LC-9 : YQ13-10001~

Revision

October, 2013

SK210LC-9 : YQ13-10001~

Remarks S5YN2246E01 (NA) S5YN2246E02 (North (North America America / Europe) Europe)

22. ［22.

HYDR HYDRAU AULIC LIC SYS SYSTEM TEM］

22.1

SUMMARY

22.1 22.1.1 .1

FUNC FUNCTI TION ON AND AND FE FEAT ATUR URES ES OF HYD HYDRA RAUL ULIC IC CIR CIRCU CUIT IT

The hydrauli hydraulic c circui circuits ts are built up with with the follow following ing functions functions and featur features es in order order to achiev achieve e easy easy operability, operability, safety, mass volume volume handling handling and low fuel consumptio consumption. n.

22. ［22.

HYDR HYDRAU AULI LIC C SYSTE SYSTEM M］

22. 22.2

HYD HYDRAU RAULIC LIC CIR CIRCUI CUITS AND AND COMP COMPON ONEN ENTS TS

STD. STD. SCHE SCHEMA MAT TIC HYD. HYD. LINE LINES S Item

1

Component name

Hyd. pump assy

YN01 YN01Z0 Z002 0235 35P1 P1(N (Nor orth th Amer Americ ica) a) / YN01 YN01Z0 Z002 0245 45P1 P1(E (Eur urop ope) e) Part No. YN10V00036F4

Model No. K3V112DTP (North (North America America : without without PTO.) PTO.)

YN10 YN10V0 V000 0040 40F4 F4

K3V1 K3V112 12DT DTP P (Eur (Europ ope e : with with PTO PTO.) .)

YN30 YN30V0 V001 0126 26F2 F2

KMX1 KMX15Y 5YD D (Nor (North th Amer Americ ica) a)

YN30 YN30V0 V001 0129 29F2 F2

KMX1 KMX15Y 5YD D (Eur (Europ ope) e)

2

Cont Contrrol valv valve e (mai (main n)

3

Sw S wing motor unit

YN15V00054F1

M5X130-CHB

4

Tr T ravel motor unit

YN15V00051F5

MAG-170VP

5

Boom cylinder (RH & LH)

YN01V00151F2

85 dia. X 120 dia. X 1355

6

Arm cy linder

YN01V00175F1

95 dia. X 135 dia. X 1558

7

Bucket cylinder

YN01V00153F1

80 dia. X 120 dia. X 1080

8

Swivel joint

YN55V00053F1

9

Pi Pilot valve (ATT)

LQ30V00033F2

10

Pilot valve (travel)

YN30V00105F2

11

Inline filter

YN50V00020F1

12

Suction strainer

LQ50V00004F1

13

So Solenoid valve assy

YN35V00047F3

8K 8KWE5A-30

14

Filt

YN52V01016F3

FZ1F183S036A

l

t

PV48K2075

Y-457400

［22.

22.2.1 22.2.1

HYDRAUL HYDRAULIC IC SYSTEM SYSTEM］

STANDAR STANDARD D (North (North America America))

��

［22.

HYDRAULIC HYDRAULIC SYSTE SYSTEM M］

［22.

22.2.2 22.2.2

HYDRAUL HYDRAULIC IC SYSTEM SYSTEM］

STANDAR STANDARD D (Europe) (Europe)

��

［22.


22.3 22.3

COLO COLOR R COD CODIN ING G STA STAND NDAR ARD D

22.4 22.4

NEUT NEUTRA RAL L CIRC CIRCUI UIT T

(2) Principle Principle::

spool sleeve is closed. closed.

The current command I to the pump's solenoid solenoid

FOR HYDRAULIC HYDRAULIC CIRCUITS CIRCUITS

This section describes bes the following following..

proportio proportional nal valve controls controls the delivery delivery rate of the

22.4.4 22.4.4

pump. (3) Operation Operation::

OPERATION (1) Type:

1.

(2) Principle: Principle:

Blue

(1) Bypass Bypass cut valve valve and unload valve valve control

Feed, drain circuit

(2) Safety Safety lock lever and pilot circuit

less than 0.44 MPa (64 psi)

(3) Pump positive ve flow control

Green

Electrical Electrical flow control control type variable pump

(4) Pump P-Q (Pressure(Pressure-Quant Quantity) ity) curve control control Return, Return, make up circuit, circuit, 0.44~0.59 MPa (64~86 psi)

22.4.1 22.4.1

OPERAT OPERATION ION OF OF UNLOAD UNLOADING ING VALVE VALVE AND BY-PASS CUT VALVE

Purple

Flow rate rate rise operation operation (Eg. (Eg. P1 pump) By operating any of control levers, the operating operating

Perform Perform an operation operation of the value from pump high

secondary secondary pressure of pilot valve rises, rises, and the

pressure pressure sensor to P-Q curve control value, and

rising rising pressure is transform transformed ed to the rise of output output

send a command command to the pump solenoid

voltage voltage corresponding corresponding to the pressure input by the

proportional valve.

low pressure sensor. Mechatro controller

HOUSED HOUSED IN CONTROL CONTROL VALVE VALVE (1) Unloading Unloading valve

Secondary pilot pressure,

PUMP PUMP P-Q P-Q CURVE CURVE CONTR CONTROL OL

(3) Operation: Operation:

signal-processes this change of voltage, resulting

The pump high pressure pressure sensor converts converts the

On starting engine, engine, like by-pass cut valve, the

in rise of command command current value I to the pump

pressure pressure to the output voltage corresponding corresponding to

secondary secondary pressures pressures output output by P1 and P2

proportio proportional nal solenoid solenoid valve and consequentl consequently y the

the pump delivery pressure.

unloading proportional valves (PSV-D, PSV-B)

pump flow rate rises. rises. This is called called "Positive tive

The mechatro mechatro controller controller converts the voltage voltage

exert on PCb and PCa ports, consequently consequently the

Control System".

output by the high pressure pressure sensor to the P-Q

(including proportional vlave)

P1 and P2 unloading unloading valves are switched switched to

As the pump command current value rises, the

curve control control value. value. On the other hand, select the

5 MPa (725 psi)

OPEN side.

secondary pressure of proportional solenoid valve

pump positive control command current value from

(including proportional vlave) 0.59~5 MPa (86~725 psi) Red Primary pilot pressure,

(2) By-pass By-pass cut valve

Orange

When machine is under normal conditions, conditions,

Main pump drive pressure, 5~34.3 5~34.3 MPa (725~4970 psi) Blue tone At valve operation Red valve When solenoid proportion proportional al valve (reducing) (reducing)

is

operating Red solenoid In active and exciting Displaying aying the flow circuit and standby standby circuit circuit when

also rises. On the regulator ator attached attached on the

the low pressure sensor in lower order, and the

pump, the spool (652) through through piston (643) is

values values are output to respectiv respective e pump proportional proportional

by-pass by-pass cut valve is closed closed normally. normally. If pilot

pushed leftward, leftward, and stops at the position where

valve as a command command current.

pressure pressure sensor or unloading unloading proportional proportional valve

being in proportion proportion to the force of pilot pilot spring spring

With this operation, operation, the pump power is controlled controlled

is disconnect disconnected ed or malfuncti malfunctioned, oned, the unloading unloading

(646).

so as not to be exceed the engine power,

valve closes completely completely.. Even if control control valve is in

The tank port connected to the large large bore of

therefore therefore engine dose not stall.

neutral neutral position, hydraulic hydraulic oil is trapped. As a

servo piston piston (532) opens, opens, and the piston moves moves

result, result, the pump relieves relieves due to pressure pressure increase.

leftward leftward by delivery delivery pressure pressure P1 of the small bore

In such the case, before before the machine machine is

resulting resulting in the increase increase of tilt angle (α).

repaired, repaired, open the by-pass cut valve manually. y.

The servo piston and spool (652) are connected connected

And the machine is operable by draining excess

to feedback lever (611). (611). Therefore Therefore when servo

oil to hydraulic hydraulic tank.

piston piston moves leftward, leftward, the spool (652) also moves rightward rightward by means of feedback feedback lever. With this

operating. Regarding Regarding the electrical electrical symbols in this manual, refer to

22.4.2 22.4.2

the electric circuit diagram.

CIRCUIT (1) Purpose: Purpose:

movement, movement, the opening opening of spool sleeve closes

SAFETY SAFETY LOCK LOCK LEVE LEVER R AND PILO PILOT T

To protect protect attachment attachment from unexpected unexpected movement for safety. (2) Principle Principle:: Cut pressure source of pilot valve for operation. operation. (3) Operation: Operation: If the safety safety lock lever (red) is pushed forward forward

gradually, gradually, and the servo piston stops at the position position the opening opening closed closed completely completely.. 2.

Flow rate rate reduction reduction operati operation on As the current value I of mechtro controller reduces, reduces, the secondary secondary pressure of solenoid solenoid proportio proportional nal valve reduces, reduces, and spool (652) is moved rightward rightward by the force of pilot spring spring (646). (646). With the movement movement of spool, spool, the delivery pressure pressure

after the engine engine starts, starts, the limit switch switch (SW-11) (SW-11)

P1 usually flows into the large bore of piston piston

is turned on. The timer timer relay is actuated actuated one

through through the spool. spool.

second later which causes the solenoid solenoid (SV-4) of

The delivery pressure pressure P1 flows in the small bore

the solenoid valve block (13) to be energized

of servo piston, but the servo piston moves

and makes the pilot pilot operating operating circuit circuit to stand by.

rightward rightward due to the difference difference of area, resulting ting in the reduction reduction of tilt angle. Similarly, Similarly, when the

22.4.3 22.4.3 PUMP PUMP POSITI POSITIVE VE FLOW FLOW CONTRO CONTROL L (1) Type: Electric flow controlled variable displacement pump.

servo piston moves rightward, rightward, the spool (652) is moved leftward leftward by the feedback lever. The operatio is maintained maintained until the opening opening of

［22.

HYDRAULIC HYDRAULIC SYSTEM SYSTEM］

��

NEUTRAL NEUTRAL CIRCUIT : Positive Positive control function at safety lock lever down (unlocked position)

［22.

22.5 22.5


TRAV TRAVEL EL CIRC CIRCUI UIT T

22.5.2 22.5.2

2-SPEE 2-SPEED D TRAVEL TRAVEL SOLE SOLENOI NOID D COMMAND CIRCUIT AND AUTO 1st

This section describes describes the following following..

SPEED RETURN RETURN FUNCTION FUNCTION

(1) Purpose: Purpose: (1) Travel Travel forward forward pilot simultaneous simultaneous operation operation circuit circuit (2) 2 speed travel travel solenoid command command circuit and

Change travel motor speed with switch. switch. (2) Principle Principle::

auto 1-speed return return function function

If the switch switch is turned, turned, an electric electric signal is

(3) Travel Travel main circuit

issued. issued. It excites the 2-speed 2-speed travel travel solenoid solenoid

(4) Travel Travel motor function

which in turn converts the primary pilot pressure and the self pressure pressure to a tilting angle of the

22.5. 22.5.1 1

variable displacement motor.

TRAVEL TRAVEL FORWAR FORWARD D PILOT PILOT SIMULTANEOUS OPERATION

(3) Operation: Operation: If the rabbit marked switch on the gauge cluster cluster

CIRCUIT

(1) Purpose: Purpose:

is pressed, the solenoid solenoid (SV-3) of the

Light operating operating force force and shockless ess operation operation

proportiona proportionall valve block (13) is excited and

(2) Mechatronics:

changes changes the proportional proportional valve. Then the

1.

A3, enters the Ps port of the travel motor (4),

solenoid solenoid command pressure is issued issued from port

2.

If the travel travel lever with damping damping mechanism mechanism is operated operated for travel travel right, right, left and forward forward

opens the oil passage to the 2nd speed select select

motions, the secondary pilot proportional pressure

piston, piston, and causes the motor to run in the 2nd

comes out of the 3, 1 ports of P/V (10). The

speed tilting tilting mode by its self pressure. pressure. However, However,

higher higher of the pressures pressures is selected, selected, comes out of

when the main circuit pressure rises above 28

the 6, 5 ports and acts upon the low pressure

MPa (4060 psi), the motor's motor's self pressure pressure pushes

sensors (SE9) (SE-10).

the 2nd speed select piston back to the 1st

The pilot secondar secondary y pressure pressure flows to PAr and and

speed.

PAL ports of the control control valve (2), moves the 3.

4.

travel travel spool, spool, and switches the main circuit. circuit.

22.5.3 22.5.3

The low pressure pressure sensor sensor output voltag voltage e is input


TRAVEL TRAVEL MAIN MAIN CIRC CIRCUIT UIT

into mechatro controller. The mechatro controller

The delivery delivery oil from Pump A1 and A2 ports by

performs performs signal signal processing processing and outputs outputs current current

changing changing the travel travel spool with the operation operation of

correspondi corresponding ng to the increase of flow rate to P1

travel travel pilot flows in each P1 port on the left side

pump proportional onal valve (PSV-P1) (PSV-P1) and P2 pump

of travel motor (4) and P2 port on the right right side

proportio proportional nal valve (PSV-P2) (PSV-P2),, and at the same time

of travel motor (4) through through C,D ports of swivel

the command current is output to P1 unloading

joint (8) from AL, AR ports of C/V, and rotates

valve valve (PSV-D) (PSV-D) and P2 unloading unloading valve valve (PSV-B). (PSV-B).

the travel travel motor. motor.

The secondary secondary pressures pressures output output by P1 pump proportio proportional nal valve (PSV-P1) (PSV-P1) and P2 pump

22.5.4 22.5.4

proportio proportional nal valve (PSV-P2) (PSV-P2) exert on pump

(1) Function: on:

TRAVEL TRAVEL MOTOR MOTOR FUNC FUNCTIO TION N

regulator regulator,, actuating actuating the pump on the delivery 5.

flow rate increase increase side.

1.

Prevents Prevents the motor motor from over running running on a slope. slope.

The secondary secondary pressure pressure delivered delivered in P1 unloading unloading

2.

Check valve valve that prevents prevents cavitation cavitation of the

valve valve (PSV-D) (PSV-D) and P2 unloading unloading valve valve (PSV-B) (PSV-B) is fed to Pcb and PCa ports provided ded in control control

hydraulic motor. 3.

valve (2). The secondary secondary pressure pressure from proportional proportional valve

4.

High/Low High/Low 2 step speed change change mechanism mechanism and

5.

Travel parking parking brake. brake.

which has exerted on PCb and PCa ports switches switches the unloading unloading spool in CLOSE side.

Shockless ess relief valve valve and anti cavitation cavitation valve when inertia force stops. auto 1st speed return at high load.

［22.


��

TRAVEL TRAVEL CIRCUIT : Travel 2nd speed, RH & LH simultaneous simultaneous operation.

［22.

HYDRAU HYDRAULIC LIC SYSTEM SYSTEM］

22.6 22.6

BUCK BUCKET ET CIRC CIRCUI UIT T

bucket cylinder cylinder head side through AC port of

22.6.2 22.6.2 This section describes describes the following following..


(1) Bucket Bucket digging pilot circuit (2) Auto accel operation operation

C/V (2). On the other hand, the return oil from

AUTO AUTO ACCELER ACCELERATI ATION ON OPERAT OPERATION ION

cylinder cylinder rod (R) side is throttled throttled by bucket spool

Auto acceleration actuates according to signals

and returns to tank circuit from BC port of C/V

from low pressure pressure sensor. sensor.

(2).


(3) Flow control control in the work mode

position>

(4) Bucket Bucket digging travel straight straight main circuit circuit

In the event where the sensor does not receive

(5) Bucket Bucket spool stroke limiter limiter

signal for 4 seconds seconds or more even though the

References: ・

accelerati acceleration on dial is set to MAX position, position, the

22.6.1 22.6.1

engine speed should be raised to 1000 rpm.

PILOT PILOT CIRCU CIRCUIT IT FOR FOR BUCK BUCKET ET DIGGING

(1) Mechatronics: 1.

When the operation operation for for bucket digging digging is

When the pressure pressure 0.6 MPa (87 psi) is input to

valve does not actuate, actuate, resulting ng in single single flow of

low pressure sensor in STD specification specification (travel, (travel,

bucket circuit.

bucket, swing, arm), proportional voltage from

performed, the pilot proportional secondary

low pressure sensor inputs in mechatro mechatro

22.6.5 22.6.5

pressure pressure is delivered delivered through through port 1 of the right right

controller controller,, and then the engine speed returns to


pilot V (9), flows to PAc port, and acts on the

the dial set position position corresponding corresponding to the lever

To secure secure simultaneous taneous operabilit operability y of boom and

low pressure pressure sensor (SE-1), (SE-1), and at the same time

operation.

arm and to prevent cavitations cavitations at low engine

The voltage voltage output output by low pressure pressure sensor controller performs signal processing and outputs

speed.

22.6.3 22.6.3

STAND-B STAND-BY Y CURREN CURRENT T CONSTA CONSTANT NT CONTROL


(2) Operation Operation:: On boosting ng up attachment attachment pressure, pressure, pilot primary primary pressure exerts on PCc port of C/V(2) C/V(2)

current current corresponding corresponding to the increase of pump

When the engine speed is intermedi intermediate ate speed or

through attachment booster solenoid valve,

lower, lower, command command current value to have the pump

operates operates stroke limiter of bucket spool, and

delivery delivery rate constant constant is output. output.

throttle throttle oil path of spool. spool. As a result, P1 pump

and (PSV-P2) (PSV-P2) on the P1 and P2 pump sides, and


to P1 unloading unloading valve (PSV-D), (PSV-D), P2 unloading unloading

Even if the engine speed specified specified by accelerati acceleration on

pressure increases, making the simultaneous operation operation of boom up and bucket digging possible. possible.

valve (PSV-B) and travel straight proportional

potentiome potentiometer ter is low speed, as the delivery rate

Even though the engine speed is low, similarl similarly y

valve (PSV-C).

corresponds corresponds to the intermedi intermediate ate speed, the

the cavitations ons can be prevented prevented by actuating actuating the stroke limiter.

In the following following pages, the relation of operation operation of

actuator actuator moves earlier er than the movement movement

low pressure pressure sensor to both the increase of pump

equivalent equivalent to the control control lever angle rate in light light

flow rate and unloading unloading proportional proportional valve is the

load operation.

same. Therefore Therefore the explanatio explanation n is omitted. omitted. The secondary secondary pressure pressure output output by P1 pump

22.6.4 22.6.4

proportio proportional nal valve (PSV-P1) (PSV-P1) and P2 pump proportio proportional nal valve (PSV-P2) (PSV-P2) exerts exerts on pump regulator regulator,, actuating actuating the pump onto the delivery

BUCKET BUCKET DIGG DIGGING ING AND TRAV TRAVEL EL STRAIGHT STRAIGHT CONFLUENCE CONFLUENCE (CONFLUX) (CONFLUX) MAIN CIRCUIT


flow increase side. The secondary secondary pressure pressure delivered delivered in P1 unloading unloading

1.

The oil delivered v ered through through A1 port of P1 pump

valve valve (PSV-D) (PSV-D) and P2 unloading unloading valve valve (PSV-B) (PSV-B)

goes into P1 port of C/V (2), opens load check

is led to PCb and PCa ports ports provided in control

valve LCc through through parallel parallel circuit and enters enters in

valve (2). The secondary secondary pressure pressure from proportional proportional valve

5.

BUCKET BUCKET SPOO SPOOL L STROKE STROKE LIMI LIMITER TER

flow rate to pump proportional proportional valves (PSV-P1) (PSV-P1) at the same time the command current current is output

4.

When the bucket operation operation and other operation operation are simultaneously performed, the travel straight

inputs inputs in mechatro mechatro controlle controller. r. The mechatro mechatro

3.

resulting in confluence with travel straight. ・

operated>

the bucket spool is switched. 2.

In bucket dumping operation, operation, the travel travel straight valve also switches switches like digging operation, operation,

bucket spool. 2.

On the other hand, hand, the oil delivere delivered d through through P2

which has exerted on PCb and PCa ports

port of P2 pump goes into P2 port of C/V (2),

switches switches the unloading unloading spool in CLOSE side.

confluences confluences with oil from P1 pump through travel

The secondary secondary pressure delivered delivered in travel straight straight

straight straight valve, and goes into bucket spool.

proportio proportional nal valve (PSV-C) (PSV-C) is led to PTb port provided ded in control control valve (2) and shifts the travel travel straight valve.

(Confluenc (Confluence e of oil from 2 pumps) pumps) 3.

With the function function of pilot circuit, circuit, the oil flow flow is switched switched from bucket spool, and is fed into

［22.


��

BUCKET BUCKET CIRCUIT : Bucket digging (Travel straight conflux), Auto-accelation Auto-accelation and Standby flow rate constant control

［22.


22.7 22.7

BOOM BOOM CIRC CIRCUI UIT T

(1) Boom up pilot circuit circuit (2) Boom up 2 pumps conflux ux main circuit in C/V 22.7.1 22.7.1

BOOM BOOM RAISE RAISE PILOT PILOT CIRCU CIRCUIT IT

(1) Operation Operation:: 1.

If boom up operation operation is perform performed, ed, the secondary secondary pilot proportional onal pressure from the right pilot pilot valve (9) gets out of port 3 and acts upon the low pressure pressure sensor (SE3). (SE3). At the same time, time, the pressure pressure acts upon the PAb and PB1 ports.

2.

The secondary secondary pressure pressure which which enters the the PAb port of C/V (2) shifts shifts the boom spool. The secondary secondary pressure which enters the PB1 port shifts shifts the boom conflux ux spool. spool.

22.7. 22.7.2 2

BOOM BOOM UP 2 PUMP PUMPS S CONFL CONFLUX UX MAIN MAIN CIRCUI CIRCUIT T IN C/V

(1) Purpose: Purpose: Boom up speed up (2) Principl Principle: e: Confluxing uxing oil from 2 pumps (3) Operation Operation:: 1.

The oil delive delivered red throug through h A1 port port of P1 pump flows flows into C/V (2) P1 port, port, and branches branches into bypass circuit and parallel parallel circuit. Since P1 unloading unloading valve is closed, closed, the boom spool is moved and bypass circuit circuit is closed, closed, the oil opens load check valve LCb through through parallel parallel circuit circuit and flows flows into boom spool. spool.

2.

Then the oil passes passes through through boom spool, spool, opens lock valve of boom lock valve CRb, and is led into H side of boom cylinder through through C/V (2) Ab port.

3.

Meanwhile Meanwhile,, the oil delivered delivered from the A2 port of the P2 pump enters the P2 port of C/V (2) and due to shut off the P2 unloading unloading valve, the oil then passes through the parallel circuit and via the restrictor restrictor on the circumference circumference of the boom conflux ux spool, pushes the load check valve CCb open from the boom conflux ux circuit, circuit, and combines nes the oil delivered delivered by the P1 pump internally. internally.

4.

The return return oil from boom cylinde cylinderr R side flows into tank circuit through through boom spool from C/V (2) Bb port.

［22.


��

BOOM CIRCUIT : Boom up operation, operation, Confluence Confluence function. function.

［22.


This section describes describes boom lower operation. operation. (1) Boom down pilot circuit (2) Prevention Prevention of natural natural fall by lock valve valve and actuation at lowering

22.7.5 22.7.5

CONSTA CONSTANT NT RECIR RECIRCUL CULATI ATION ON FUNCTION FUNCTION OF BOOM DOWN MAIN CIRCUIT


(3) Constant recirculation ation function function of boom down main

Prevention of cavitation during boom lowering

circuit

motion. (2) Principle Principle::

22.7.3 22.7.3

BOOM BOOM DOWN PILOT PILOT CIRCU CIRCUIT IT

(1) Operation Operation::

The oil returning returning from the boom cylinder cylinder head (H) is recirculated recirculated to the rod (R). (3) Operation: Operation:

1.

2.

3.

If the boom down down operation operation is performed, performed, the

When the oil is supplied to the boom cylinder cylinder

secondary secondary pilot proportional proportional pressure pressure comes out of

rod (R) side during boom down operation, operation, the

portaC portaC of the right pilot valve (9) and acts upon

boom moves faster than it should do in some

the low pressure pressure sensor sensor (SE-4). (SE-4).

cases by the self weight of the attachment. attachment.

At the same time, the pressure acts upon the

On that occasion, on, the circuit circuit pressure on the rod

PBb port of C/V (2).

(R) side is on the negative ve side.

The voltage voltage output output of the low pressure pressure sensor

The oil supplied to the boom cylinder cylinder rod (R)

(SE-4) (SE-4) enters enters the mechatro mechatro controller controller and

flows flows into the A1 port port of the P1 pump and the

processed processed in it.

P1 port of C/V. The oil then passes through the

Then, the proporti proportionl onl secondary secondary pressure pressure fed into

boom spool and goes out of the Bb port.

C/V (2) PBb port and branches branches off in two lines

On that occasion, on, the oil returning ng from the head

and switches boom spool and releases releases boom lock

(H) goes through the recircula recirculation tion path in the

valve.

boom spool, pushes the check valve in the spool open, is recirculated ated to the Bb port and is

22.7.4 22.7.4

PREVENTIO VENTION N OF NATURA NATURAL L FALL

supplied ed to the rod (R). When the (R) pressure

BY LOCK VALVE AND ACTUATION ACTUATION

is larger than the head (H) pressure, pressure, the check

AT LOWERING LOWERING

valve in spool closes. closes.

(1) Purpose: Purpose: Preventio Prevention n of natural fall when the lever is neutral. neutral. (2) Principl Principle: e: The oil is prevented prevented from returning returning to the boom spool by the poppet seat of the boom lock valve. (3) Operation Operation:: In the boom down action, action, the selector selector valve is changed changed over by the secondary secondary proportional proportional pressure pressure of PBb port. Then the poppet spring chamber chamber of the lock valve CRb gets through through the drain line (Dr) and makes the lock valve valve poppet open. When the boom lever is at neutral, neutral, the drain line on the lock valve CRb poppet spring chamber chamber is closed closed which causes the poppet poppet closed. closed. The result is that the oil returning returning from the boom cylinder cylinder head (H) to the boom spool is held and makes the leak from the boom spool zero. Thus the boom cylinder cylinder is prevented prevented from making making a natural natural fall.

Thereupon, the recirculation is stopped.

［22.


��

BOOM BOOM CIRCUI CIRCUIT T : Boom down operation operation & Preventi Prevention on of natural boom falling. falling.

［22.


22.8 22.8

SWIN SWING G CIRC CIRCUI UIT T

22.8.3 22.8.3

SWING SWING MAIN MAIN CIRC CIRCUIT UIT

(1) Operation: Operation: This section section describes describes the following following operations. operations.

The oil delivered delivered from the A2 port of the P2

(1) Swing left pilot circuit

pump enters enters the P2 port of C/V (2) and is

(2) Swing auto parking parking brake

branched branched off into the bypass line and the parallel parallel

(3) Swing main circuit

circuit. circuit. However, However, since the bypass line is closed closed

(4) Swing motor circuit circuit

as the swing spool is shifted, the oil pushes the load check valve LCs open through the parallel

22.8.1 22.8.1

PILOT PILOT CIRCU CIRCUIT IT FOR LEFT LEFT SWIN SWING G


circuit, circuit, enters the B port of the swing motor motor via the Bs port of C/V (2), and rotates rotates the swing swing motor counterclockwise.

1.

When the left swing ng operation operation is performed, performed, the pilot proportional secondary pressure is delivered

22.8.4 22.8.4

through through port (5) of left pilot V (9), and the

(1) Anti cavitation cavitation circuit at swing deceleratio deceleration n

secondary secondary pressure acts on PBs port of C/V (2),

(2) Preventing Preventing the swing motor from being reversed reversed

and simultaneousl simultaneously flows flows out from Pss port of C/V and acts on low pressure pressure sensor (SE-5). (SE-5). 2.

The voltage voltage output output by the low pressure pressure sensor is input in the mechatro mechatro controller, controller, and is signal-processed.

3.

Then, the secondar secondary y pressure pressure led into PBs port port of C/V (2) switches the swing spool. spool.

22.8.2 22.8.2

SWING SWING AUTO AUTO PARKI PARKING NG BRAKE BRAKE

(1) Purpose: Purpose: Swing Swing lock in neutral neutral position and parking parking (2) Principl Principle: e: Release Release mechanical brake only when required required to operate operate swing and arm in. (3) Operation Operation:: 1.

The swing swing parking system system excites excites the swing swing parking parking SOL (SV-1) (SV-1) usually if the key switch switch is turned turned on and works by the action of the mechanical brake.

2.

The mechanical mechanical brake brake is released released if the swing swing parking parking solenoid is de-excited de-excited only when the secondary secondary operating pressure pressure in the swing and arm in actions acts upon any of the low pressure pressure sensors sensors (SE-5, (SE-5, 7).

3.

The swing parking parking solenoid solenoid (SV-1) (SV-1) is excited five five seconds seconds after the pressure of the swing low pressure pressure sensors (SE-5) is reduced to zero. In the case of arm in operation, operation, the swing parking ng solenoid solenoid (SV-1) is excited excited the moment the pressure pressure of the arm in low pressure pressure sensor (SE-7) (SE-7) is reduced reduced to zero. This causes the mechanical mechanical brake to operate. operate.

SWING SWING MOTOR MOTOR CIRC CIRCUIT UIT

circuit. (3) Shockless ess relief valve circuit. circuit.

［22.


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SWING CIRCUIT CIRCUIT : Swing operation (LH)

［22.

22.9 22.9


section section and travel right tandem tandem path. Then

ARM ARM CIRC CIRCUI UIT T

because because arm 2 spool was switched, switched, the delivery delivery This section section describes describes the following following operations. operations.

oil opens load check valve LCAT2, goes through arm 2 spool, spool, and confluences uences with P2 pump

(1) Arm in, light-load light-load operating pilot circuit

delivery delivery oil in the valve section, section, and then is

(2) Arm in, light-loa light-load d variable variable normal recircula recirculation tion

flowed flowed into arm cylinder head (H) side through through Aa

main circuit / internal internal conflux main circuit circuit

port of C/V (2). 3.

22.9.1 22.9.1

port because the arm lock valve CRar is open,


and is flowed into arm 2 spool through through arm 1

Speed-up Speed-up and Anticavit Anticavitatio ation n when the arm is at light loaded.

The return return oil from arm cylinde cylinderr (R) side flows flows in Ba port of C/V (2) and passes through through the Ba

ARM IN, LIGHTLIGHT-LOA LOAD D OPERATING OPERATING PILOT CIRCUIT CIRCUIT

spool. 4.

(2) Principl Principle: e:

Becaus Because e arm 2 spool spool is switched switched to normal normal recirculation position, causing restriction of

The oil returning returning from the arm cylinder cylinder rod (R) is

passage passage to tank, the return return oil from arm cylinder

recirculat recirculated ed variably to the head (H) at arm 2

(R) side flows into arm cylinder (H) side.

spool in C/V.

-Because, -Because, at light light load, the pressure pressure in cylinder cylinder


rod (R) side is higher than that in the head (H) side, it opens the check valve housed-in housed-in arm 2

1.

When the arm in operati operation on is performed, performed, the

resulting resulting in the speed up of arm-in operation at

port 7 of the left pilot valve valve (9) and acts upon the

light load.

low pressure sensor (SE-7).

2.

spool and is recircula recirculated ted in the head (H) side,

secondary secondary pilot proportional proportional pressure pressure gets out of 5.

Cavitation Cavitations s prevention prevention control in arm-in operation operation

At the same time, the pressure is branched off

Command Command current is output output to arm 2 solenoid solenoid

in two flows, acts upon the Paa1 port and the

proportiona proportionall valve by signal signal processing processing of E/G

PLc2 port, changes changes over the arm spool and the

speed and arm-in arm-in pilot pilot pressure, pressure, accordingly accordingly the

arm lock valve CRar. releases. releases.

arm 2 spool is switched switched to neutral neutral (cavitations (cavitations

The output output voltage voltage by the low pressure pressure sensor is

prevention) position, resulting in cavitations

input into mechatro controller, controller, and is pilot

prevention.

signal-pr signal-processe ocessed, d, and is output to P1, P2 pump proportio proportional nal valve (PSV-P1), (PSV-P1), (PSV-P2) (PSV-P2) and arm 2

Position Position of arm 2 spool

inverse proportional valve (PSV-A). 3.

The secondary secondary pressure from pilot pilot proportional proportional valve, valve, which is reduced reduced by arm 2 inverse inverse proportio proportional nal valve (PSV-A) (PSV-A) switches switches arm 2 spool. spool.

22.9.2 22.9.2

ARM-IN, ARM-IN, LIGHT LIGHT-LO -LOAD AD VARIAB VARIABLE LE NORMAL RECIRCULATION, INTERNAL INTERNAL CONFLUX CONFLUX MAIN CIRCUIT

(1) Operation Operation:: Reference: 1.

The P2 pump delivery very oil flows flows in travel travel left

conflux), ux), when the attachment attachment to which the circuit in

branched branched off in by-pass circuit and parallel lel

P1 pump side is applied ed is operated, operated, the meter-in meter-in

circuit, circuit, but because arm 1 spool is switched, the

path of arm 2 spool is closed, closed, resulting resulting in single flow

delivery delivery oil which goes through parallel circuit

operation.

opens load check valve LCa and is flowed into arm 1 spool. spool. 2.

In light-load arm-in operation (normal recirculation,

section on through P2 port of C/V (2) and is

On the other hand, hand, P1 pump delivery delivery oil oil flows in P1 port of C/V (2), and the flows flows in travel travel straight

［22.


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ARM CIRCUIT CIRCUIT : Arm in (Light load) operation, Arm variable recirculation & Anti cavitation function

［22.


This section section describes describes the following following operations. operations.

CRar, CRar, but because because the arm lock valve CRar is open, the return oil goes through arm lock valve

(3) Arm in, heavy load operating operating pilot circuit circuit (recirculation cut)

CRar and flows in arm 2 spool. 4.

The return oil returns returns directly directly into tank tank circuit

(4) Arm in, heavy load operating operating sequence sequence confluxed

because because arm 2 spool is switched to recircula recirculation tion

main circuit

cut position.

22 22.9 .9.3 .3

ARM ARM IN, HEA HEAVY VY LOA LOAD D OPERATING OPERATING PILOT CIRCUIT CIRCUIT

(1) Operation Operation:: 1.

Left pilot pilot valve actuation actuation due to arm-in operation operation

2.

In arm-in arm-in operation, operation, when the heavy loading loading is

is equivalent equivalent to that at light load operation. on. applied ed to arm and the P2 pump pressure increases increases to the set pressure, pressure, the voltage voltage output by P2 pump pressure pressure sensor (SE-23) (SE-23) is converted converted to signal (signal processing) processing) by mechatro mechatro controlle controller, r, consequently consequently the current current of arm 2 solenoid proportional valve is controlled according to the load pressure pressure and the arm variable recirculation is cut. When the recirculat recirculation ion is cut, internal confluence confluence is held similarly arly to that in light load operation. operation.

22 22.9 .9.4 .4

ARM ARM IN, HEA HEAVY VY LOA LOAD D OPERATING OPERATING RECIRCULATI RECIRCULATION ON CUT MAIN CIRCUIT CIRCUIT

(1) Purpose: Purpose: Power Power up for arm in operation operation (2) Principl Principle: e: Cut the recirculat recirculation ion and reduce reduce rod pressure. (3) Operation Operation:: 1.

P2 pump delivery very oil flows ows in the travel travel left section on through P2 port of C/V (2) and branched off in by-pass by-pass circuit circuit and parallel parallel circuit. circuit. Consequentl Consequently the arm spool is switched switched and pushes and opens load check valve LCa through through parallel parallel circuit, circuit, and flows flows in the arm spool.

2.

On the other hand, hand, P1 pump delivery delivery oil oil flows in P1 port of C/V (2), and flow in travel travel right tandem tandem passage passage through through travel travel straight ght section. section. Then because arm 2 spool was switched, switched, the delivery delivery oil opens load check valve LCAT2, LCAT2, and confluences uences with P2 pump delivery delivery oil in the valve valve section, on, and is flowed into arm cylinder cylinder head (H) side through Aa port of C/V(2).

3.

The return return oil from arm cylinder inder (R) (R) side flows flows in Ba port of C/V(2) C/V(2) and is flowed to arm lock valve


［22.


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ARM CIRCUIT CIRCUIT : Arm in (Heavy load) operation, Arm confluence & recirculation cut function

［22.


This section section describes describes the following following operations. operations. (5) Arm out pilot circuit circuit

weight of the arm and bucket. (2) Principle Principle::

(6) Arm out 2 pumps conflux conflux main circuit

Complete ete seat of the return return circuit circuit against the

(7) Natural fall protection protection with arm lock valve

arm spool of the arm cylinder cylinder (R) side circuit. circuit. (3) Operation: Operation:

22.9.5 22.9.5

ARM OUT PILOT PILOT CIRC CIRCUIT UIT


1.

When the secondary secondary pressure pressure for arm operation operation disappears disappears and the arm cylinder cylinder stops, the

1.

When the arm out out operation on is performed, performed, the

pressure pressure on the rod (R) side passes through through the

secondary secondary pilot proportional proportional pressure pressure gets out of

selector selector of the lock valve from the Ba port of

port 8 of the left pilot valve valve (9), and acts upon

C/V, acts the back pressure on the lock valve

the low pressure pressure sensor (SE-8). At the same

CRar and seats the lock valve.

time, time, the oil is branched off in two flows and act 2.

The operating ng proportional proportional secondary secondary pressure pressure

the arm due to oil leaks through through the arm spool is

flowed flowed in Pba1 port of C/V (2) switches switches the arm

prevented.

Then, the operating operating secondary secondary pressure pressure flowed flowed in PBa2 port of C/V (2) switches switches the arm 2 spool valve.

22.9.6 22.9.6

ARM OUT 2 PUMPS CONF CONFLUX LUX MAIN CIRCUIT CIRCUIT

(1) Purpose: Purpose: Arm out operation speed up. (2) Principl Principle: e: The oil delivered delivered by the P1 pump is confluxed with that delivered by the P2 pump in C/V (2). (3) Operation Operation:: 1.

P1 pump delivery very oil opens opens load check valve valve (LCAT2) (LCAT2) by switching switching arm 2 spool and confluxes uxes with P2 pump delivery oil just short of the arm lock valve.

2.

And, P2 pump pump delivery delivery oil flows flows through through arm 1 spool and confluence confluences s with P1 delivery delivery oil, opens lock valve of arm lock valve CRar with free flow and is flowed flowed into arm cylinder cylinder rod (R) side through through Ba port of C/V(2). C/V(2).

3.

Since Since the oil flow into into the arm spool from from the lock valve is shut off completely, y, natural fall of

1 spool. spool. 3.

2.

upon the PBa1 and Pba2 ports of C/V (2).

On the other other hand, the return return oil from from arm cylinder cylinder (H) side flows in Aa port, and returns into tank circuit through arm 1 spool and arm 2 spool. spool. The return line which does not pass through through boost check valve is used for this return return circuit circuit to reduce the pressure pressure loss.

22.9.7 22.9.7

NATURA NATURAL L FALL FALL PROTEC PROTECTIO TION N WITH ARM LOCK VALVE VALVE

(1) Purpose: Purpose: To prevent the arm from falling naturally naturally by the

［22.


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ARM CIRCUIT : Arm out operation, operation, Confluence Confluence function function

［22.


22.10 22.10

P2 pump flows in left travel travel spool to travel travel

COMBIN COMBINED ED CIRCUI CIRCUIT T

leftward. This section describes describes only the differenc difference e in combined ned

The delivery oil flowed into travel straight straight spool of

operation.

P2 pump flows in right travel travel spool because the

(1) Boom up / travel, travel, pilot circuit circuit

right travel operation.

travel travel straight spool is shifted shifted and exerts exerts on the (2) Boom up / travel, travel, main circit

(In travel straight operation, operation, P2 pump delivery delivery oil exerts exerts on travel travel operation.) operation.)

22.10.1 22.10.1 BOOM BOOM UP / TRAVEL, TRAVEL, PILOT PILOT CIRCUIT (1) Operation Operation:: 1.

The mechatro mechatro controller er outputs command command current to travel straight solenoid proportional valve after signal signal processing, processing, and the solenoid solenoid valve outputs outputs secondary secondary pressure and acts on PTb port of C/V (2).

2.

Then the pressure pressure of PTb port switch switches es the travel travel straight valve.

22.10.2 22.10.2 BOOM BOOM UP / TRAVEL, TRAVEL, MAIN CIRCUIT (1) Purpose: Purpose: To insure insure straight straight travel movement during travel operation operation even if the attachment attachment is operated. operated. (2) Principl Principle: e: The travel action and the attachment attachment action are actuated actuated by separate separate pumps. pumps. (3) Operation Operation:: 1.

P1 pump delivery very oil flows flows through through P1 port of C/V(2) C/V(2) and branches branches off in P1 parallel parallel circuit and travel straight spool. P2 pump delivery oil flows through through P2 port of C/V(2) C/V(2) and branches branches off in P2 tandem tandem circuit circuit and travel travel straight straight spool.

2.

The delivery delivery oil flowed flowed into P1 parallel parallel circuit circuit of P1 pump opens check valve CP1 and LCb and flows flows in boom spool, which exerts exerts on boom up operation. The delivery oil flowed flowed into travel straight straight spool of P1 pump opens check valve CT2 because the travel travel straight spool is shifted, shifted, and flows flows in boom conflux ux spool and exerts on boom up operation operation with the internal oil conflux. (In travel straight operation, operation, P1 pump delivery delivery oil exerts exerts on swing operation operation of attachment attachment.) .)

3.

The delivery delivery oil flowed flowed into P2 tandem circuit circuit of

4.

Howeve However, r, a portion portion of the flow is led to the travel travel straight ght spool notch restricti restriction. on. The speed of attachment attachments s like travel, boom, etc. is adjusted adjusted by the circuit of restricti restriction. on.

［22.


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COMBINED COMBINED CIRCUIT CIRCUIT : Boom up & Travel forward 1st speed operation, Travel straight function.

［22.


In this section, section, the independent independent operation on is omitted and describes describes differenc difference e in combined combined operation. operation. (3) Swing / Arm in light light load, pilot circuit circuit (4) Swing / Arm in, swing priority priority main circuit

22.10.3 22.10.3 SWING SWING / ARM IN LIGHT LIGHT LOAD, LOAD, PILOT CIRCUIT CIRCUIT (1) Operation Operation:: 1.

On operating operating swing swing (left) (left) and arm in motions motions simultaneously, mechatro controller outputs command command current current to travel travel straight ght solenoid solenoid proportio proportional nal valve (PSV-C) (PSV-C) and arm 2 solenoid solenoid inverse inverse proportion proportional al valve according according to signal processing, and this proportional valve outputs secondary secondary pressure, which acts on PTb port and PAa2 port of C/V(2). C/V(2).

2.

PTb port pressure pressure switches switches the travel travel straight straight spool according according to the secondary pilot pressure, pressure, and the PAa2 port pressure pressure switches switches the arm 2 spool to the forced forced recirculat recirculation ion position. position.

22.10.4 22.10.4 SWING SWING / ARM IN, SWING SWING PRIORITY PRIORITY MAIN CIRCUIT (1) Purpose: Purpose: Stable swing speed. (2) Principl Principle: e: Raise the oil pressure flowing flowing to arm cylinder, cylinder, and give a priority of the delivery delivery of P2 pump to swing operation. (3) Operation Operation:: 1.

The swing swing main circuit circuit operates operates with with P2 pump flow. flow. But on P2 pump circuit side, the flow goes to the swing circuit and arm circuit circuit simultaneously taneously because the swing swing circuit circuit and arm circuit circuit are parallel. parallel. The arm 2 spool is switched switched to forced forced recirculat recirculation ion position and the opening opening of meter-out meter-out is not there, so the pressure of return oil is raised, raised, causing the rise of circuit circuit pressure pressure on the arm cylinder cylinder head (H) side.

2.

At the same time time meter-in meter-in of arm 2 spool spool closes closes and arm in conflux is therefore therefore cancelled, cancelled, and delivery delivery oil from P2 pump and P1 pump are combined combined in the parallel parallel circuit on P2 pump side because because the travel straight ght spool was switched. The conflux oil of P1 and P2 delivery delivery oil in high pressure pressure flows in swing side taking priority priority over all others. This operation is called "Swing Priority Circuit".


［22.


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COMBINED COMBINED CIRCUIT CIRCUIT : Swing / Arm in operation, swing priority function

［22.


22.11 22.11

rate to the minimum. minimum.

PRESSU PRESSURE RE DRAINI DRAINING NG 2.

This section section describes describes the following following operations. operations.

Unloading Unloading proportiona proportionall valves (PSV-D, (PSV-D, PSV-B) output secondary secondary pressure pressure and the secondary pressure pressure flows in PCb, PCa ports of C/V(2) C/V(2) and

(1) Pressure Pressure drain (releasing) easing) pilot circuit circuit

switches switches the P1, P2 unloading unloading valves to OPEN

(2) Pressure Pressure drain (releasing) easing) main circuit circuit

position.

22.11.1 22.11.1

PRESSURE PRESSURE RELIEVING RELIEVING PILOT PILOT CIRCUIT

22.11.2 22.11.2

PRESSURE PRESSURE RELEASE RELEASE MAIN MAIN CIRCUIT

(1) Purpose: Purpose: To release the pressure pressure in main circuit circuit for piping piping repair works. (2) Principl Principle: e: After the mode is switched to "Pressure Relief

��

Mode" with switch on gauge cluster, cluster, mechatro mechatro controller outputs the following commands.

(1) Operation: Operation: When the operating operating lever is shifted shifted to neutral neutral

1. 2. 3.

Minimum Minimum tilting tilting command command value value to pump

during engine running, "DRAINING HYD.

proportional valve (PSV-P1, PSV-P2).

PRESS." PRESS." is displayed displayed on the gauge cluster cluster while while

Output Output "Pressure "Pressure relief control control speed command command

the mode switch switch is changed changed to pressure relieving relieving

value" value" at ECU. ECU. (Electri (Electric c system) system)

mode. In this time the intermitt intermittent ent buzzer sounds

Stand-by Stand-by command command value to P1, P2 unloading oading

continuousl continuously. y. When right and left operating operating levers levers

proportional valves

are operated operated 4 or 5 times to their full stroke, pressure is relieved.

How to switch switch to "Pressu "Pressure re release release mode"

1.

2.

Select Select the service service diagnosis diagnosis mode.

starter starter key and buzzer sound stops. If the pump

(Hold down the "BUZZER "BUZZER STOP SWITCH" SWITCH" on

pressure pressure is determined determined to be more than 1 MPa

gauge cluster, cluster, turn the starter key switch on.)

(145 psi) by the output value of the high pressure pressure

Select Select the service service adjustment adjustment mode mode 1.

sensor or the high pressure pressure sensors (SE-22,23) (SE-22,23)

(Under (Under the condition condition that "Screen No.1" of

are broken, "FAIL DRAIN DRAIN HYD. PRESS" PRESS" is

"Service "Service diagnosis diagnosis mode 1" is indicated indicated,, hold

displayed displayed and the buzzer sounds continuousl continuously. y. In

down the "BUZZER "BUZZER STOP SWITCH", SWITCH", press the

that case, also the buzzer is not stopped unless

"MENU "MENU SWITCH" SWITCH" 3 times. times. When "SERVICE "SERVICE

the engine key is turned turned to OFF. Repeat the

MENU" MENU" is displayed, using "UP" switch or "DOWN" switch, select "SERVICE ADJUST 1". Press "NEXT" switch, to select "SERVICE 3.

4.

If the travel straight straight valve is turned turned to the pressure pressure release release position, position, the oil delivered by

Using "UP" "UP" switch switch or "DOWN" switch, switch, and select

each pump is unloaded unloaded to the tank passage. If

"PRESS DRAIN".

the spools are switched switched by pilot pilot operation, operation, the

Then press "NEXT" switch, switch, and cursor cursor points points to

remaining remaining pressure from the actuators actuators may be

"OFF".

relieved relieved to the tank circuit, circuit, i.e. the main circuit circuit

Press "UP" "UP" switch switch to display "ON", "ON", and press

pressure pressure may be released. released.

Screen Screen of gauge cluster cluster changes changes to ordinary ordinary display, and "DRAINING HYD. PRESS." is appeared.

(3) Operation: Operation: 1.

pressure pressure releasing releasing procedure once again. again. (2) Hydraulics Hydraulics::

ADJUST 1-2".)

"MENU" switch. 5.

After draining pressure is completed, turn off the

Pump proporti proportional onal valve valve reduces the pump flow

［22.


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PRESSURE PRESSURE DRAIN (RELEASE) (RELEASE) CIRCUIT : At pressure release mode.

［22.


23. ［23.

23.

ELECTR ELECTRICA ICAL L SYSTEM SYSTEM］

ELECTRICAL SYSTEM T AB LE OF CONTENTS

23.1 23.1

ELECTR ELECTRIC IC CIRCUIT CIRCUIT DIAGR DIAGRAM AM (North (North America) America) ��23-3

23.2 23.2

ELECTR ELECTRICA ICAL L EQUIPM EQUIPMENT ENT LIST (North (North America) America) ��23-13

23.3 23.3

ELECTR ELECTRIC IC CIRCUIT CIRCUIT DIAGRAM DIAGRAM (Europe) (Europe) ��23-15

23.4 23.4

ELECTR ELECTRICA ICAL L EQUIPM EQUIPMENT ENT LIST (Europe) (Europe) ��23-25

23.5 23.5

HARN HARNES ESS S ��23-27

23.5 23.5.1 .1

HARNES HARNESS S LIST LIST ��23-27

23.5.2 23.5.2

INSTRUM INSTRUMENT ENT PANEL PANEL ASSY ASSY ��23-28

23.5.3 23.5.3

CONTRO CONTROLLE LLER R INSTALL INSTALL �� 23-29

23.5.4 23.5.4

OPERATO OPERATORS RS CONTRO CONTROLS LS �� 23-33

23. ［23.

ELECTR ELECTRICA ICAL L SYSTE SYSTEM M］ Issue

Date of Issue

Applicable Machines

First edition

June, 2013

SK210LC-9 : YQ13-10001~

Revision

October, 2013

SK210LC-9 : YQ13-10001~

Remarks S5YN2346E01 (NA) S5YN2346E02 (North (North America America / Europe) Europe)

［23.

23.1 23.1

ELECTRICAL ELECTRICAL SYSTEM SYSTEM］

ELECTR ELECTRIC IC CIRCUI CIRCUIT T DIAGRAM (North America) America)

��

［23.

ELECTRICAL ELECTRICAL SYSTEM］

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��

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��

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23.2 23.2


ELECT ELECTRIC RICAL AL EQUIPM EQUIPMENT ENT LIST (North America) America)

��

［23.


［23.

23.3 23.3


ELECTR ELECTRIC IC CIRCUI CIRCUIT T DIAGRAM (Europe)

��

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［23.


��

［23.


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��

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��

［23.


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［23.

23.4 23.4


ELECT ELECTRIC RICAL AL EQUIPM EQUIPMENT ENT LIST (Europe)

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［23.


SK210LC-9 Shop Manual

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