7. 7-1
HYDRAULIC
COMPONENTS
Hydraulic
pump
1. Appearance Bolt for Back-up Dr
a3
PNl
PSV2
a8
㌔∼i ◎
0
7
a6
∠
A3
◎
◎◎ ◎ ◎
◎
◎
a5
PH2
./a
萄昏 鍋
(M8)
◎
○
◎薗 ◎◎
㊨
㌔3 PHl
PSVl
a9 PN Bolt for Back-up
PSVl
(M8)
a9
uLAEIp ”T 壷 a.
a5 ◎
◎
㊨
i;
由
1 ◎
○
○
@
a5 a9 ◎
雷
PN 2
◎
◎
&
試
◎ ーーーーーーラペ
◎
㊨
◎ ○
◎
* ◎
◎
①
◎
㊨
◎
103
㌔
7-1①
a6
① 出ぐ/
Dr3
a2
◎
PNl
# *
倭
◎
Bl
＼
K
@
a
⑩
al
PH2
/
W
♯
*
&
野
A3
2.
Hydraulicdiagram
of main
pump
(FRONT) a5
PSV2
PSrla.A. A2a2
PNl
(REAR)
暮pN2a6
●▼■
｢
.I-T--
r;tn a8
I-J
I
PNl
+
｢
] ｢
+
+
l ■■■一■■_■J
ー
_
訂1 L三
a9
._+
PN2
丁￣a4
■■ll■
a3 ｢￣1 l
ヽ____J
■●●一■J
t[i
r＋
Dr
a7
BI
._L
K3Vl12DT-1RAP-9TIL
l -】■-■■-
■■
▲L
B3
SK200-6 Mainpump
-
l t■
_ニ
unitMode]
I
A3
Dr3
SK230-6
SK320-6
K3Vl12DT-1RAP-9TOL
K3Vl12DT-1RAP-9TOS
Model Gearpump
ZXIOLGRZ2-06D
105×2/10 (Gearpump)
Displacementcc/rev
(Rotationdirection)min-1(rpm)
2,200(2,200) (C]ockwiseviewed fromshaftend)
Highid]ingmin-1(rpm)
2,220(2,220)orlovv
Ratedspeed
Ratedpressure
MPa(kgf/cm2)
Mainpump
34.3(350)
Gearpump
4.9(50)
ATTboostpress.MPa(kgf/cm2)
115×2/10 (Gearpump) 2,100(2,100)
2,300(2,300)orJovv
2,200(2,200)
2,385(2,385)orlow I
37.8(385)
210×2/20(G.P) ra言x8･.flogT/rcaX)L/min
238×2/21(G.P)
250×2/22(G.P)
106.6(145)(inc一ude 129(175)(include 177(240)(include gearpumpinputtorque)gearpumpinputtorque) gearpumpinputtorque) /3.4(4.6)(gearpump) /3.4(4.6)(gearpump) /3.4(4.6)(gearpump)
Max.inputpowerkW(PS)
509.6(52)(include 588.4(60)(incJude 735.3(75)(include gearpumpinputtorque) gearpumpinputtorque) gearpumpinputtorque) /14.7(1.5)(gearpump)/14.7(1.5)(gearpump) /14.7(1.5)(gearpump)
●
.T?qxl去nputN･m(kgf･m) AverageO.1(1)
!inmnie.r.P.rceaSsSiunrgeMPa(kgf/cm2) SurgeO.39(4) OilquantityincasingL
2.8
-
Nega-Con/Total
Controlcharacteristic
powershiftcontro] Mainpump
125
Gearpump
1.6
126
I
Weightkg +J■
Note
104
7-2①
:
G.P
is Gearpump.
3.
Structure
1)
Mainpump ?32
? B9
53S
532
214
548
531
534
Ⅵ氾
Ⅵ投
724
901
8CB
954
ワ1?
151
211
1S2
∝冶
953
A
I BB8
261 4C6
ILL-:_-:_
才10
7ワ4
U 113
111
r`￣ヽ
it
127
ヽJ
∼)､., I+
123
′
ヽ_ -__′ ノ■
￣l
_∫-
｢二 I
ワ10
トー
251
212
153
?17
49O
1S6
981
1S?
3
3
488
312
114
12＋
886
88S
141
314
211
401
●
546
l I
rl I
325
Code
Name
Q'ty
Code
111
Shaft(Front)
1
313
113
Shaft(Rear)
1
114
Sp]inejoint I
123 124
Rol[erbearlng Needlebeanng
I
Name
l
VはW
?2S
A
Q'ty
Code
Name
Q'ty
Valveplate(Front)
1
725
0-ring(JJSB240l-Pll)
7
314
Valveplate(Rear)
1
728
0-ring(JISB240l-P24)
4
1
325
Cover
1
732
0-ring
2
2
401
Socketbo暮t(M20×210)
8
774
Oi[sea]
2
406
Socketbolt(M8×20)
4 789
1
Back-upnng
●
(J]SB2407-P18)
2
127
BearlngSPaCer
4
407
Socketbolt(M6×30)
3
141
Cy)inderb[ock
2
466
VPplug(PFl/4)
2
151
Piston
18
468
VPp]ug(PF3/4)
4
152
Shoe
18
490
P)ug(Meek)
20
806
Nut(M16)
2
2
808
Nut(M20)
2
I
11i3 Retainer 156 157
I
2
Sphericalbushing Cylinderspnng
￣￣皇11 Shoep[ate 212
Swashplate
●
531
Tiltingpln
792
Back-upr]ng
●
(J[SB2407-G35)
●
2
2
532
Servopiston
2
824
Snaprlng
2
18
534
Stopper(Large)
2
885
Pin(中8×12L)
2
2
535
Stopper(Smal))
2
886
2
546
Spacer
2 I
Ill
SprlngPln
4
901
Eyebolt(M10)
2
2
2
214
Tiltingbushing
2
548
Feedbackp]n
953
Setscrew
251
Support
2
702
0ィIng
2
954
Setscrew
2
261
Sealcover
1
710
0-ring(JISB2401-G95)
1
981
Nameplate
1
983
Rivet
2
I
■
271
Pumpcaslng
2
717
0-ring(JISB2401-G145)
4
312
Valveblock
1
724
0-ring(JISB2401-P8)
16
105
7-3①
2)
Regulator
①
Structure
of regu一ator
8ワ5
734
755
ろワヰ
858
836
654
855
B9?
652
851
624
601
629
6∝)
628
ト入
トーB
612
○
653 614
ヰ12
8ヰ1 801 615
81ヰ ○
○
925
813
A
831
LB
627
811 898
l ■
e:.'3
1 l
:;
｢ Lal
732
ワ56
‡ホ
?32
一丁￣
Section
418
496
VALVE
ASSY.
626
625
?33
887
763
AA
SOLENOID
くYN35VOOO18F2)
646
4&
㊨ 438
ト一宇
92ヰ
■￣ヽ
′
l
801 -●
ー■
▲ -
I I
643
644
ワ00
Section
645
7
監∋ 投
8
BB View
Bo一t for back-up E
(Regular ◎
(1n back-up condition)
Section
DD
C
II Jr-
｢
position)
Bolt for back-u ◎
訟
ヽ一■
ヽ_J
a3 PNl
P2
l 1
1
545
+
+ 543
Section● EE Hydrau一ic
7-4①
diagram
Name
Q'ty
Code
Name
sムcketbott(M8×50)
2
730
0-ring(JISB2401-P22)
1
413
Socketbolt(M8×70)
2
732
0-ring(JISB2401-P16)
2
418
Socketbo]t(M5×12)
2
733
0-ring(J[SB2401-P20)
2
436
Socketbolt(M6×50)
5
734
0-ring(JISB240l-G25)
1
438
Socketbo[t(M6×20)
4
753
0-ring(JJSB2401-P9)
1
439
Socketbolt(M6×40)
4
755
0-ring(JISB2401-Pll)
6
466
VPplug(PFl/4)
3
756
0-ring(J[SB2401-P26)
2
467
Plug(PF3/8×M8)
1
763
0-ring(JISB2401-G35)
1
496
PIug
18
801
Locknut(M8)
3
541
Seat
2
814
Snapring(JISB2804SR-15)
1
543
Stopperl
2
836
Snaprmg
545
BalI
2
858
Lockingring(J[SB2804RR-15)
2
Code 412
I
Q'ty
●
1
60l
Caslng
1
874
Pin(中4×11.7L)
1
611
Feedback[ever
1
875
Pin(中4×8L)
4
612
Lever(l)
1
887
Pin
1
613
Lever(2)
1
897
Pin(中4×19L)
l
614
FulcrampTug
1
898
Pin(中6.5×9L)
1
615
Adjustplug
1
924
Setscrew
1
621
Compensatingpiston
1
925
Setscrew(Ql)
1
622
Pistoncas[ng
623
Compensatingrod
1
079
So)enoidvalve
1
624
Springseat(C)
1
I
1
I
625
1
Outersp｢lng ■
626
lnnersprlng
1
627
PIunger(C)
1
628
Adjustscrew(C)
1
629
Cover(C)
1
630
Locknut
1
63l
Pfsleeve
1
641
PiLotcover
1
642
Rod
1
643
Pilotpiston
1
644
Springseat(Q)
1
645
PIunger(Q)
1
●
646
Pilotsprlng
1
651
S一eeve
1
652
Spoo)
1
653
SprlngSeat
由4
Returnspnng
Tightemng
Code
I
1 I
●
1
torque Size
412,413
M8
29.4(3)
436,438,439
M6
ll.8(1.2)
466
PFl/4
36.3(3.7)
467
PF3/8
73.5(7.5)
496
NPTFl/16
8.8(0.9)
630
M30×1.5
■
655
Setsprlng
1
656
Portplate
1
708
0-ring(JISB2401-G75)
1
722
0-ring(JISB2401-P6)
2
724
0-ring(JISB2401-P8)
12
725
0-ring(JJSB2401-Plo)
1
727
0-ring(JJSB2401-P14)
1
728
0-ring(JISB2401-P18)
1
107
801
7-5
Torque
N･m(kgf･m)
M8
156.8(16) 15.7(1.6)
②
Operation
of regulator
COMP[NSÅTING
HORSE
POWER
LEVER
r`￣｢
PART
CONTROL
CONTROL
NEGAT暮VE
LEVER
⑥＼＼ ㊨
㊨ ,A
/ ′
′
l
人
:@
ヽ
＼
/
∫ I l
○
I
I
㊨
㊨
′
OIL FLOW CONTROしPART
F〔[D
LEVER
BACK
*
∫
SERVO
PISTON
⑤
し.+
+
′￣￣● N〔GATIVE
COMPENSAT(NG
SPOOL
CONTROしSPOOし
l
l
㊨
仁
I
⑧
⑧
l I I
⊥-｢
㊨
￣ネ J
巧工二
｢
し-r ニL
｢
i
FEED
I I
卜
+
+
‥...._.
†＼
†＼､
PISTON
Feed
back
servo
2.
The
negative
contact
3.
The
lever is connected
piston,
with
and
contact
with
pin
control
with
､､
㊨ reaching
3 pins, spool to large
lever is connected
groove
lever is connected
with
control
compensating
rod
groove
attaching
holes
with
spool
negative
compensating
1
i)cT●＼
LEVER
＼
1.
㊨ ⊥一ー
i
l
BACK
l J
/
l
I
一1
＼
し
/
畦L=@ 1 1 !十｢-+
I
･
/
〇
+
㊨
SERVO
㊨
r
㊨
ROD
COMPENSATING
㊨
■■■
+
PISTON
of negative
2 pins,
a
control on
pinfij(ed
to pin ⑤ attaching lever, and control lever.
Tilting
pin㊤.
casing
⑤,
and
pin㊤
in
part.
2 pins,
part.
a
pin fixed
on
casing
㊨, and
a
pin
㊦
in
@
diagram
Conceptual
for pump
operation
Flow
r8t8
F)ow
uP
Left Large
diameter
rate Right
Side small
＋
self･pressure
●
T8nk
down
C
Servo
diameter
Self-pressure
piston
Swash
Cylinder
1
･
This
is the mechanism
pJate
block
the inc血ation
to vary
side
from
resulting
movmg
servo
piston
right
and
left. 2
3.
･
That
is the right movement
the flow
rate,
the flow
rate.
The
diameter 4.
On
5.
Now,
the left movement
and
diameters
of
servo
piston "large
side” and
the small
diameter
the self-pressure
result, the
servo
servo
of
piston
on
the sw礼sh plate vertical slightly reducing the inc血ation of swash plate larger increaslng
piston
makes
makes
left sides differ, and
right and
diameter
to the large
moves
to
referred
as
"small
the
side” for explanation.
side, the self-pressure is given
are
is always diameter
due
rightward
to
given.
sidelike
the
the small
difference
of
area
diameter reduclng
As
side. the
a
flow
rate.
6.
7.
109
By
connecting
the large
●
difference
of pressure
The
havmg
pump
diameter
these
increasmg actions
side to tank, the flow is caued
a
7-7
the
servo
piston
moves
rate.
variable
displacement
pump.
leftward
due
to
the
④
Regulator
operation
SMALL
DIAMETER
＼ナ 532
㌔
SERVO-PISTON
ヽ
LARGE
@531
T[LJtNG
PIN
J
DIAMFrER
613 611
LEVER
FEEDBACK
LEVER
LEVERl
625
OUTER
SPRJNG
i(E) 1NNER
1
SPRING
874
PIN
T ＼ Cl Pl 651 654
RETURN
652
SLEEV〔
/
SPRJNG
/′｢
SPOOL
I
)
∼
646
ヽヽ
621
COMPENSATING P)STON
() 897
ヽ
'ヽ･二
B98
㊨
/
875
P[LOT
PJN
PJN
⑥(ド)
･@531
548
647
STOPPER 623
110
643
P∫川
COMPENSATING
ROD
7-8
T)LT[NG FEED
P(N BACK
PIN
PJSTON
PJLOT
SPRING
@
Conceptual
diagram
of regulator
([n
operation
case
flow
of negative
rate
control)
㊨ ヽ
Self･pressure
②
l
Negative
fever
control
′
ヽ
A
@
＼
Sleeve
/ ノl
∩
ヽ
e)
ヽ
⑤
Spool
㊨
⑬
㊨
Sprinョ
C) Self-
=
＼
reSSur
+/
/
∫
⑥
⑥
Servo
●■
⊥
I diamete
Smal
piston
∫ ノー
①
I J■■
Negative
contro一
spooJ
① ③ Feedback
ン′ Negative
control
㊨
pressure Large
The Each 1.
regulator
2.
is connected
negative a
with The
feedback
servo
piston
lever
⑥
･
While
4.
The
force
and
sprlng
and
pin
①
force.
②
is
control
① ①.
by
joined
pin
spool
by
pin
㊨
through
up
to
joined
㊨
pin
is
the casing
securing
attaching
spool
the large
hole
⑤, tilting part
on
④
pin
the
in contact
negative
the
on
attached
lever
control
lever. lever is setinneutral,
the operation
㊨, and
spring
for the hydraulic
plnS.
with
③
and
the balance
●
of the negative
groove
plate
by taking
lever
control
compensating
3
Swash
be controlled
can
regulator The
di8mete｢
一ever
the negative
moves
control
② moves
lever
control
negative
the negative spool
rightward
control
④ rises
pressure
pressing
the
rightward. the
making
pin㊦
the casing
securing
to ful-
Crum.
5.
Then,
the feedback
6.
Therefore,
7.
The
8
･
The
9
･
Besides, pin
the spool
movement
piston
⑥,
and
⑤ the
the moving to fulcrum mo血g to the
moves
rightward
the tilting
making
pin㊤
to fulcrum.
rightward. the self-pressure
enables
servo
of sw礼sh
by
corresponding
111
moves
③
⑤ moves
of spool
tilting angle
㊨
lever
plate
servo
is very
rightward
close
④
control
1eftward･ pressure.
7-9
due
to vertical
⑥ rightward,
piston
the pin
negative
⑥
piston
to reach to
to the
hole
the difference
reducing
the feedback
Therefore,
large
of
the flow lever
its movement
③
side of
servo
area.
rate.
moves
stops
making at
the
the angle
⑥
compensation
(1)
control
COMP[NSÅrlNG
PI
COMPENSATING
ROD
SPRING
(令
COMPENSATING
CL -
I--
■■￣
SPRING
②
-■■
I
ヽ
ヽ
I I I
ヽノ
l
i__
○ COMPENSÅTING PI TON
し丁-
ユ十 ト⊥＼
｢
●
L
｢ ￣
､ ＼
+ ∩』 し主
-＼
+･･-ヽ
F｡OMIpL,puMP
＼
Pl
1.
The
delivery
Delivery
:
(Pl)
pressure
P2
pressure,
and
:
Companion
pump
companion
PUMP PRESSURE
P,(P,) DELIVERY
pump
pressure-
pressure
(P2)
actuates
compensating
piston. 2.
And,
3.
However, flow
try
to
the piston
move
to right
by
●
turnmg
the spring force of compensating is delivered. in maximum as
the compensating spring
①
is stronger
rod. than
LJl ヽ-J
】
｢
リ ｢
+
+
l ■■■■▲.■■...1..▲l
L三
辿L
_1_
112
7-10
]T-
that
of piston,
the
⑦
compensation
(2)
control
COMPENSATINGし亡VER SPOOL COMPENSA¶NG RETURN
ROD
SPRING COMPENSÅ口NG PI
CL
｢￣
①
SPRING
COMP【NSŶNG
￣一■ー
㊨ 杏
@
SPRING
ノ
亡〉 L P 2
○
COMP〔NSÅnNG N P!ST BACKしEV〔R
FEED
SMALL CHAMBER
⊂=〉
LARGE DIAMETER CHAMBER
L37.R=
PISTON
』
￣十
9
`●｢
｢●一
し二f--.･､て SWASH
Pl
Small 1.
diameter As
2.
The
3.
pin
4.
Then,
5.
Pin
㊨ also
6.
Pin
④
7.
Pl
8.
Delivery
㊦ at
113
P2
pressure,
Always
and
pump
self-pressure
pump
companion
Companion
:
by
actuated
compensating
moves
is connected
moves
piston
pressure
(P2)
pressure
(Pl). is higher
the force
of compensat-
delivery
part
(Feed
back
lever is
back
lever,
to right.
the feed
with
Large
-
Pl actuates due
both
to the
pin㊤
for casing.
moved.) the spool
so
(large
faces
with
the fixed
is also moved
to right.
chamber.
difference
connected
fulcrum
right
diameter
to right.
moves
also
to
is directly
flow
and,
lever is moved
to right
perpendicular
groove
rod
(Delivery)一CL pressure
to right,
moves
rod
compensating
Servo
The
;
(Pl)
compensating
closer 10.
De一ivery
Pl
PLATE
①.
ing spring
9.
:
chamber
the delivery
piston
DIAMETER
diameter,
tilting plate, and
to the piston.
is reduced.
7-ll
smau
diameter).
then
the
servo
area.
the swash
plate
will be closer
and
⑧
Compensation
contro一
R【TURN
(3) (At
steady
condition)
SPOOL
SPRING
COMPENSATING
LEVER COMP【NSA¶NG
PI
CL r-
COMPENSATING
③
1
①
SPRING
SPRING
②
ヽ
㊨ ′
ーノ
L_
P2
Pl
○
管･
しT･⑨ SERVO
ヽ_′
..⊥‥
PJSTON
L
｢丁
￣■￣-￣■■---＼
ヽ
し主 ●､ヽ 1.
As
soon
as
114
servo
piston
to right,
moves
BACKしEVER
㌔
WASH
the feed
back
lever
PLATE
connected
with
pin
⑤
also
to right.
moves
④
2.
Pin
3.
(Pl)
4.
Then, sure
the
FEED
＼
J:
●
moves
and
to left fulcrum
(CL)
ports
㊨. (Spool
moves
to
left.)
areclosed.
the tilting plate win of delivery
the pin
pressure
be steady
(Pl)
and
on
the angle
companion
7-12
corresponding
pressure
(P2).
plate
to the
summed
pres-
@
Compensation
(4) (Oj[ f]ow
controf
increasing)
COMPENS♪JING
LEVER COMPENSATING
R〔TURN
SPRJNG
SPOOL
SPRING
Pl
COMP〔NSATING
6; 各
｢￣￣￣
①
SPRING
②
豆 ノ
くコ し P2
Pl
○
E
COMPENSATING R
D
FEED
BACK
LEV〔R
く=コ
L..
a
■｢￣ √/ ー●-
し
●
--.
＼
●■l-■
.-1
一￣￣￣ヽ
1.
2.
115
When
the summed
low
pressure.
The
spring
power
of compensating is moved
the compensating
rod
3.
Pin㊦
to left.
4.
Then,
5.
And,
6.
Large
diameter
7.
Servo
piston
8.
The
swash
9.
The
delivery
moves
also
lever
the compensating is moved
spool
moves
to
plate
angle
flow
①
spring
CL
●
return -
sprmg.
T
(Tank).
left. becomes
the companion
and
to left fulcrum
moves
-
and
②
is stronger
pump
pressure
than
the summed
㊨
for casing.
to left.
to left by
chamber
(Pl)
of delivery
pressure
Pl
large.
is increased.
7-13
the fixed
pin
(P2)
become
pressure,
⑩
Power
shift control
Pl
CL ●一-
｢
`■￣
一ヽ
I
I
＼
PIN
ノ
t> Pf
し_
P2
Pl
○
⊂=〉
L..
●◆-
(
し P,
Pf
1.
Controller
2.
However,
3.
The to
116
recognizes the power
pressure
Pl
by
au
Compensating
5.
Therefore,
Powershift
digging
of
piston engine
engine
coming
from
to the engine
horse
horse
speed to
moves
power
pressure
(M
･
A
･
B)
modes.
shift pressure
corresponding
actuating
4.
:
the solenoid
valve
is fixed.
(power shift pressure) (Mechatronics E.S.S)
sensing.
power
right throughpin. and
pump
horse
7-14
power
w山be
fixed.
is conducted
⑪
Negative
flow
control
SPOOL N【GA¶VE
SL【〔VE
PI
RETURN
tl
SPRING
CL
r-TI,I
L∈VER
CONTROL
_
■l
I
NEGA¶∨ CONTR
I
J l
Pi
しSPRING
■■■■
/
′ ヽ_
I
ヽノ
⊂=>
I
N
EGATIVE CONTROL
｢I
●
●
SPOOL
しT-L
｢
I
FEED
BACKし[V〔R
･･1'
I
PISTON
S〔RVO
LARGEJ
SMA CHAMBER
ETER
DIAMETER CHAMBER
｢
｢'￣＼＼
‥_ノ
+..
､､＼
･･ヽ SWASH
Pi
:
Negative
control
Small
pressure,
1.
The
negative
control
pressure
2.
The
negative
control
spool
3.
Pin
⑥
4.
Then,
the negative
on
the negative
bore
One
PI pressure
pump
it constantly
on
acts
rises. moves
rightward.
control
groove
spool
lever
control
:
Pl
PLATE
moves
section
moves
taking
rightward
rightward. securing
pin
②
to
the casing
as
a
support.
㊨ moves
5.
Pin
6.
Because
7.
Pl
8
㊤
pin
is connected
(Self pressure)一CL
One
･
rightward.
pump
pressure
Pl
feedback
Large
bore.
-
to the
acts
on
both
faces
lever, the spool
of
servo
piston,
also
and
the
moves
rightward.
servo
piston
moves
righト
ward. 9
Because
･
the
approaches The
10.
servo
close
Therefore･
117
piston the Pl
piston
is directly
connected
with
the swash
plate, the swash
plate
verticauy. flow
the feedback
And, of To
delivery
servo
rate
reduces.
lever connected in ltem
8, and
CL
ports.
and
it is held
with
the spool
at the angle
⑤ moves
pin moves
of sw礼sh
rightward
leftward
taking
plate corresponding
7-15
concurrently pin
⑧
to the
as
a
with
the movement
support.
negative
control
pressure.
Regulator operation Comparison when controlling pump proportional valve and back-up operation
1 ) Pump proportional valve control @ This is loaded flow rate control (negative control) type that the delivery flow rate reduces when secondary pressure (Pi) of pump proportional valve rises.
@ Under the condition where the rod (642) is tightened, (See Figure), pump proportional valve secondary pressure (Pi) is led in pilot piston (643) and controls the pump delivery flow rate.
@ Pilot pressure (PSV) enters from the left
a8 PN1
side, and is closed in A chamber with rod (642).
@ Negative control pressure (PN1) enters from right side, and is closed in B chamber with rod (642).
1 ) Pump propo. valve controlled
Therefore, the pump delivery flow rate is varied by the negative control/compensating pressure which is calculated by deducting back pressure (Tn2) from negative control pressure (PN1).
643
PSV
2 ) Buck-up control function
@ When CPU mechatro controller fails, relaxes rod (642) (See Figure), and the function changes into hydraulic pressure control.
@ The secondary pressure (Pi) circuit of the
C'
642' TOpiiot piston at propo. valve control led
pump proportional valve closes due to the movement of rod (642).
@ With the rises of one pump delivery pressure P1 and other pump delivery pressure, the pump delivery flow rate is reduced automatically, and controls the input torque constant. (When the number of rotation is constant, the input power becomes constant.)
@ Pilot pressure (PSV) enters from the left side, and is led from A and C chambers into pin (898), and acts on compensating piston (623), and finally the power is controlled to the constant power. Therefore, the pump delivery flow rate is controlled by acting pilot pressure (PSV) and negative control pressure (PNl), and one pump pressure (PI) and other pump pressure (P2) on the compensating piston (623) and pilot piston (643).
2 ) When controlling back-up function
643
P I : Self press. P2 : Other press. PSV: Pilot press. PN1: Nega-Con press. Pi : Secondary press, of propo. valve 623 : Compensating piston 642 : Rod (Screw) 643 : Pilot piston 898 : Pin
3
)
Gear
(Forpi[ot control)
pump
ワ1 0
7∞
433
435
351
354
Suction
PF3/4
:
port
Delivery ■一一-
PF 3/8
■ ■■■■
ヽ
ヾ
′
//
434
// / ′
7,/ ′
｢// // // //
扮
￣＼ヽ ヽ＼ ＼l＼ ltl
㊨
//
312
port
-■一一■￣
----
ユニ
/I;
′ = 〟 〟 〟
ノ
(:@ ヽ､､-ーノノ′
窃
ノ ノ■ ′ ノl
311
ワ32
班)9
361
435
310
353
Drain
ort
:
307
誹)8
4&
･355
850
ヰ66
725
ワ28
ヰ67
PF3/8 Note:
Oppositeside
1.
Sideof
ofcauJkingcaulking
After
assembly thedrivegear
(1.Okgf･m) 2･ Det ailoffiJter Code
Name
307
Poppet
308
Seat
309
3･
Q'ty
smoothly
o‖ess. of gear the sliding
on
pump,
apply
to the
oil
section. of the into contact
in the left figure ■
the
wjth
1
that check at 0.1 N.m
pump,
Bringtheoppositesideofcaulking fi[tershown
■
rotates
assemb)y
sufficient(y
l
Spnngseat
After
of gear
insert end face, paylng installing direction.
attention
l A3
■
310
Sprlng
1
31l
Adjustscrew
1
312
Locknut
1
351
Gearcase
1
｢￣ ￣￣￣￣￣￣￣｢ l
I I
,_..! I
lヽ l
a3
353
Drivegear
1
354
Drivengear
1
355
Filter
1
361
Frontcase
1
433
SocketboJt(M8×40)
2
434
Socketbolt(M8×55)
2
435
Socketbolt(M8×20)
4
B3
466
Plug(PFl/4)
1
Hydraulic
467
Adapter(PFl/2-PF3/8)
1
700
Squarenng
1
710
0-ring(JJSB2401-G95)
1
725
0-ring(JISB240l-Pll)
1
312
728
0-ring(JISB2401-P18)
1
433,434
732
0-ring(JJSB2401-P16)
1
435
850
Lockingring(JJSB28041RR-18)
1
466
l I
I
1
l
119
I
Dr4
l
I
!･･,･,I
L__Tl串ヰJ Tightening Code
7-17
circuit
torque Threadsize M14×1.5
Torque
N･m(kgf･m) 29.4(3.0)
M8
16.7(1.7)
PFl/4
15.7(1.6)
