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Technics SC-HD51 SC-HD81
WireDescription Wire Wire Number Color
Description
Wire Wire Number Color
Failure Mode Identifiers (FMI) List
RD
Battery (+)
10 2
RD
Front Flood Po wer wer
447
PK
10 5
RD
499
YL
GY
S P ID aat
BU
S P IL oa d
Key Switch Powe r r
10 8
BU
Wiper Motor Pow er
4 14
Data val id but a bove n bove ormal op ormal erationa erationa l range .
10 9
O R
Alt Output (+) Terminal
1 2
Data val id but b elow no elow rmal op rmal erationa erationa l range. Data e rratic,intermitte rratic, nt, orincorrect. nt,
11 2
PU
Main Power Relay Output
500
BR
11 3
O R
Monitor Panel Powe r r
501
GN
3
Voltageabovenormalor sho rted hi rted gh.
11 4
RD
Warning Horn Powe r r
502
OR
Wiper- Fron t ( HI )
11 6
B R Rear Flood Power
503
BR
Wiper- Rear( Park)
4
Voltagebelow n ormalor sho ormal rted lo rted w. w.
5 6
Currentbelownormalor ope n circu it. it. Current a bove n bove ormal o ormal r ground ed circu ed it. it.
7
Mechan ical sys ical tem notrespond tem ing pro ing perly. perly.
8 9
Abnorma l freque ncy, pul ncy, se width,or peri od. Abnorma l update.
10
Abnorma l ra te o te f ch ange. ange.
11
Failuremodenot id entifiabl entifiabl e.
12 13
Baddeviceor omponen o c mponen t. t. Out of calibratio n. n.
Monitoring System Modes M o de O f O p er a ti o n
M o de N u mb e r
O N
A/C and Blower Powe r r
504
O R
Side Flood Powe r r
505
BU
Wiper - Rear( HI )
13 0
G N
Auxiliary Power
506
PU
Washe r - Fron t
13 1
R D CAES/METS Power
507
WH
Washer e r - Rear
13
O R
Auxiliary Power
508
Pu
Radio Speaker k er- Lef t
YL
Auxiliary Powe r r
509
WH
Radio Speaker- Left (Common)
RD
Auxiliary Powe r r
511
BR
Radio Speaker k er- Right
BU
Powertrain Contr ol Power
512
GN
RadioSpeaker- Right (Common)
15 0
RD
513 515
PK
516
ON
Blower Mot or ( Medium) i um)
517
BU
Blower Mot or ( Low ) A/CSwitch to RefrigerantSwitch
WH
A/ C Clutch to ThermostatSwitch
18 6
RD
Power Outlet Po wer wer
523
BR
Wiper- Lef t( Par k)
19 7
G N
Implement Contr ol Power
524
BU
W iper- Lef t( Low)
19 8
RD
Secondary Brake Pow er
525
GY
W iper- Lef t( HI )
Ground Circuits
526
YL
Wiper- Right( Park) W i pe r- R g i ht ( Lo w)
2 3
2 07
Tattletale (Log)
4
270
Units
5
BK
Ma n i C ha ss si G o r un d
5 27
GN
201
BK
Op ear t or M o int or R et u nr
5 28
PK
Wi p er - R i gh t( HI )
2 03
BK
Ch as si sG o r un dD a i gn os it c
5 29
WH
W as he rL ef t
BK
St ar et rG o r un dD ai gn os it c
5 30
OR
BK
E M S- I lI d n e t C od e0
BK
E M S I- l I d n e t C od e1
BK
EM S- lI d en tC od e2
5 92
BU
D CD / CC on ve tr er O ut pu t
273
BK
E MS -l I I d n e tC o d e3
5 93
GN
Co n de n so rF a nR eal y t oM ot o sr
274
BK
EM S I-lI d en tC o d e4
513
PK
DC / D CCov n e tre rM em oyr O upt u t
275 29 1
BK BK BK
FuelLevelSender EngineCoolantTemperatu re Sensor re TorqueConverterOil Te mperatur mperatur e Sen sor sor DataLink SensorPowe r Supply ActionAlar m ActionLamp HydraulicOil Temperatu re Sensor re Brak e AirPres s ure sure DisplayDataLink DisplayPowerSupply BrakeOil Tempera ture Sensor ture
BU OR
304
WH
306
P i t ch S o el n iod t oT ir g ge rS w ti c h- D u laT i tl M o m en t ar yS wtic ht oS i ng l eT itl S oel n oi d - D u laT i tl
BR
6 08
G N
609
S t ar et rN o. 1 S ol en oi d
GY
Tac homet o meterLamp- EMS-Il
YL
Speedom et erLamp- EMSIl
6 63
GY
310
PU
Start Aid S witch toStart Aid So lenoid lenoid
311
WH
Star tAidSolen o id t o TempSwit ch oid
779
WH
Ri ppe r PinEngage g e Solenoid o id
312
PK
St art er No.2 Solen o id t o Resis oid t or
780
PU
Ri pperPinDis en g ageSolen gage o id oid
St art erNo.2 Resist ort o Diagn o st ic ost
700
St ar et rR el ay N o. 2 O ut pu t B c a ku pA alr m
GY
337
WH PrelubePushbut u t tonSwit ch t o Pr el be b u e Timer
W ar nni gH onr ( Fo r w a r d)
Monitoring Circuits GN GY
PK
HydraulicOil FilterTemp
Schematic Location
Machine Location
CONN 1
B-11
14
CONN 2
C-11
14
CONN 3
C-11
16
3E-9205
Solenoid - Dual Tilt
109-30 3 2
S o lenoi d- Q u ic kD or p Valv e
3E- 8 575
S o lenoi d- R pi per P ni Pul elr
3E-6333
Solenoid - Start Aid
Ac c es s o r yP o w er
A tl er na ot r( R) T er m.
GN
Di sp a l y+ V
708
P K
S P I Cl oc k
PU
793
BU ATA Datali l i nk-
794
YL GN
7 10
Ma set rF a lut L a m p
BR
7 15
PU
716
WH
EM SI-l O p reaot rS wtic h
D ec el er at or P ed al S at tr A d i R el ay T hr ot lt eS wi c t h( Lo wI dl e) T hor tlte S wi t ch ( L w o I d el P airt y)
412
BU
E n gi n eC o loa nt F l ow
717
YL
OR
FuelFilt er Dif f er ential Pr essur s ur e
718
BU
Thr ot t leSwit ch ( Hi gh I dleParit y)
426
BR
Powerrtai nO i l Filt er Dif f er ential Pr essur s ur e
C O NN 1 1 M on iot rS evr i ce C o n e tco r CONN 12 CONN 13
F - 11
A
I-10
49 49
I-9
49 49
CONN 14
A-9
E
CONN 15
A-9
E
CONN 16
B-9
A
CONN 17
C-10
Sensor -Engine OilPressure
D-2
2 2
6
Solenoi d - AC Clu tch tch
G-3
28
Solenoid -Dual Tilt
G-1
29
Solenoid -Flexaire FanActuator
G-2
44
7
Solenoid -Quick Drop Valve
F-1
3 2
7
Solenoid -Ripper Pin
B 1- 2
33
1
10 48
47
45
49
38
H-9
C
A-8
A
CONN 20
B-8
7
Solenoi d - StartAid
D-5
E-9
7
Solenoid -Winch
D1 - 1
45
Breaker - Key
E-10
7
Starter -#1/Prelube
1-3
34
Breaker - Main
F-11
7
Starter-
B-5
34
Breaker - Power Outlet
F-10
7
Suppressor -Arc #1
A 1- 2
33
Breaker - Implement 44 50 51
6
28
5
41
11
17
29
4
35
39
21
53
46
3
37 22
34
F-9
7
Suppressor -Arc #2
A 1- 2
33
Caterpillar Monitoring System
C-10
A
Suppressor -Arc (A/C) #3
D-2
4
H-9
4 2
Suppressor - Arc(A/C) #4
G-2
4
9
Switch -AC Bina ry ry
G-3
28
B
Switch- Acce ssory ssory
B-9
A
Switch- Blo wer wer
I-10
A
Control - Prelube Timer
G-4
Converter - 24V to 12V
F-12
Decelerator Pedal
C-9
10
Dimmer
D-10
A
Switch - Clutch BrakeBackup Alarm
G-10
CONN 21
B-8
A
Diode-ACClutch
G-3
11
Switch - ClutchBrake Neu tral Start tral
D-10
C
CONN 22
F-8
50 50
Display - Flexaire Fan
H-6
A
Switch - Co olant Fl olant ow
E-2
20
E-7
13
Switch - Diff Stee r Backup A larm
D-10
B- 1 2
13
Switch - Diff Ste er Neutral S er tart
H-10
Switch -Disconnect
A
54
9 18 19
CONN23 CAES/METS Power andDatalink
G-8
A
Fan-Defrost(Front)
C O N N24 R e mot eC a l
G 8-
42
Fan-Defrost(Rear)
CONN 25
A-7
E
CONN 26
C-6
51 51
CONN 27
D-6
50 50
Fuses Gauge Cluster
F-10 , F-8,F-9
F-2
46 46
Switch - F lood (Fro nt) nt)
D-9
A
F-1
12
Switch - Flood (Rear)
C-9
A
A
Switch - Flood (Side)
C-9
A
Switch- Hor n
D-12
D-6
50 50
E-6
50 50
Horn - Lo
CONN 30
E-6
50 50
KeySwitch
C-9
E-6
50 50
Lamp - Master Action
CONN 31 CONN 32
F-6
50 50
CONN 33
D-8
50 50
CONN 34
G -6
50 50
CONN 35 CONN 36 C ON N3 7 D ai gn os it cC on ne ct or CONN 38
G -5 H-6 H6 -
6
15 42
9 50 50
1
38
18 18
E-4
53 53
CONN 40 CONN 41
G -4 B-2
9 55 55
CONN 42
F-2
54 54
CONN 43 G -2 28 28 Theconnectorsshowninthis chartarefor harnesstoharnessconnectors. Connectors that join a harness to a component are generally located at or near the compone nt. SeetheComponentLocationChart. nt.
13
5
47
50
C-5
CONN 39
36 35
48 50
C
49
9
18
22
4
21
E
A
D
44
51
32
2 17 39
11 12
19
D-10
A
Motor - Blower
I 1- 1
13
Switch - Hydraulic Filter Bypass
E-1
36
Motor - Condensor #1
B- 1 2
14
Switch - Hydra ulic FilterTemp ulic
E-1
3 6
Motor - Condensor #2
B- 1 2
14
Switch -Operator
B-9
A
Motor - Washer (Front)
I 1- 2
15
Switch - P itch Contr ol
E-11
B
Motor - Washer (Left)
I 1- 2
1 5
Switch - Prel ube Oil Pr essure
G-4
3 7
15
Switch -PTO Filte r r
Motor - Washer (Rear)
I 1- 2
55
20
I 1-1
38
Motor - Washer (Right)
I 1- 2
15
Switch - P TO Filter T emp
1 1- 2
38
A-5
C
Switch -Quick Dr op
C1 - 2
39
Motor - Wiper (Left)
A-6
C
Switch - Ripper PinPuller
C-12
B
B-10
C
Switch - S ingle/Dua l Tilt
E-11
C
33
14
Motor - Wiper (Right)
A-6
B-9
A
D-12
B
Switch- Thro ttle ttle
E-12
B
F-10
B
Switch - W iper (Fro nt) nt)
A-10
Radio 12V
B-6
D
Switch -Wiper(Left)
A-10
A
Radio 24V
B-7
D
Switch -Wiper(Rear)
A-10
A
Relay - Condensor
B- 1
14
Switch - W iper (Righ t) t)
A-10
A
A
Relay - Main
E-11
7
Tachmeter
D-11
A
Relay-Start#1
E-11
7
Ultrasonic Fuel Level
H1 - 2
40
Relay-Start#2
E-11
7
Winch Joystick
D-11
B
Relay-StartAid
D-5
17
A = Operator Com partment - Fron t Dash
D = Operator Comp artment - Overh artment ead Consol ead e
B = Operator a torComp a rtment- Righ artm t Console o le
E = Operator Comp a rtment artm
C = Operator Compartment - Left Console
Normally closed switch that will open with an increase of a specific condition. No circle indicates that the wire cannot be disconnected from the component. This indicates that the component has a wire connected to it that is connected to ground.
This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
Reed Switch - A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
Sender - A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperatureorpressure.
T
Relay (Magnetic Switch) - A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay. Solenoid - A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work.
Harness And Wire Symbols Harnessidentificationcode Thisexampleindicates wire 135 in harness "AG". * C-C4 130-6795
* AG-C3 130-6795
Socket
Wire Color Ground Connection
* Harnessidentificationletter(s)anda serializing code. The "C" stands for connectorandthenumberindicates which connector in the harness.
Wire, Cable, or Harness Assembly Identification ation AG-C4* 111-7898 1
325-A135PK-14
Pin
Single Wire Connector
Wire Gauge
Part Number For L-C12* ConnectorAssembly 3E-5179 325-A135PK-14
Receptacle
Circuit Number Identification
Typicalrepresentationof a Deutsch connector. The plug contains all sockets andthereceptaclecontains all pins.
Fuse
Plug 2
200-L32BK-14 Pin or Socket Number
1 2
Machine location are repeated for components located close toget her
Machine Harness Connector And Component Locations
B
Switch -Start Aid
Power Outlet Socket Power Post
CircuitBreaker Symbol
Flow Symbol
Normally open switch that will close with an increase of a specific condition (temp-press-etc.). s-etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it.
R es si o t r- S a t tr er D / a i gn os it c/ Pr el ub e
G ag eL a mp s- E M S- IC l o tnr ol C icr u ti s
Connector Location
15°C MIN (59°F MIN)
C om po ne nt D es cr p i it on Resistor- Blower Moto r Speed
3 E- 78 42
Action Lam p - Rear Master
Connector Number
25 ± 3°C (77±5.4°F)
9G-1 9 50 950
Control Circuits
322
WH
124-827 4
Title
BU GN
662
411
Normally Open ²
Related Electrical Service Manuals
6 33 661
4 10
-
F l oo dL am p- Fr o nt
M ai n P o w e rR eal yC oli
4 03
275 to 1750 kPa¹ (40 to 255 psi)
FloodLamp- Side
St art erRelay Co i l t oNeutr alSt art SWorKeySW il
4 05
AC Binary
D as hL a m pB as ci
Key Swit h c t o Neutr alSt art Switch
PU
Normally Closed
114-533 3
FloodLamp- RearRippe r
YL
GY
St atre rR eal yN o .1 O upt u t
OR
630
OR
B R
Normally Open
30 ± 7kPa (4.3 ± 1.0psi)
F ol o dL a m p- R a er
YL
6 10
GN
3 1 2
-
30 ± 7kPa (4.3±1.0psi)
Lighting Circuits 60
E MS I- lC el ar
St ar t er No.1 Resist ort o Diagnost n ostci
307
3 14
Normally Closed
210 ± 70kPa (30 ± 10psi)
² Contact postion at the contacts of the harness connector.
YL
308
313
43°C MIN (109.4°F MIN)
Hydrauli c Oil Fil ter Bypa ss ss
¹ A hysteresis band exist s: with increasing pressure the closed condit ion can be maintained up to 2800 kpa (405 psi), with decreasing pressure the closed condition can be maintained down to 170 kpa (25psi).
