8-7
1. REMOVAL AND INSTALL
REMOVAL
Lower the work equipment to the ground
and stop the engine.
Operate the control levers and pedals
several times to release the remaining
pressure in the hydraulic piping
Loosen the breather slowly to release the
pressure inside the hydraulic tank.
Escaping f luid under pressure can
penetrate the skin causing serious injury.
Loosen the drain plug under the hydraulic
tank and drain the oil from the hydraulic
tank.
·Hydraulic tank quantity : 124ℓ(32.8 U.S.
gal)
Remove socket bolts (11) and disconnect
hoses (1,2).
Disconnect pilot line hoses (5, 6, 7, 8, 9,
10).
Remove socket bolts (12) and disconnect
pump suction pipe (4).
When pump suction tube is disconnect-
ed, the oil inside the piping will flow out,
so catch it in oil pan.
Sling the pump assembly and remove the
pump mounting bolts.
· Weight : 100 kg (220 lb)
Pull out the pump assembly from
housing.
When removing the pump assembly,
check that all the hoses have been
disconnected.
GROUP 3 PUMP DEVICE
12
1
11
4
2
3
A1
A2
B1
Pi1
Dr
B3
A3
Psv
Pi2
5
6
7
8
9
10
1)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
※
(8)
※
13031GE18
14098MP01
14098MP02
8-8
INSTALL
Carry out installation in the reverse order to
removal.
Remove the suction strainer and clean it.
Replace return filter with new one.
Remove breather and clean it.
After adding oil to the hydraulic tank to the
specified level.
Bleed the air from the hydraulic pump.
Remove the air vent plug (2EA).
Tighten plug lightly.
Start the engine, run at low idling, and
check oil come out from plug.
Tighten plug.
Start the engine, run at low idling (3~5
minutes) to circulate the oil through the
system.
Confirm the hydraulic oil level and check
the hydraulic oil leak or not.
2)
(1)
(2)
(3)
(4)
(5)
(6)
①
②
③
④
(7)
(8)
8-9
2. MAIN PUMP (1/2)
STRUCTURE
1)
406
113
152
151
124
719
312
711
901
954
724
534
792
702
214
548
531
532
732
789
535
808
953
886
717
406
774
111
261
127
123
710
824
251
490
212
211
153 156 157 467
728
468
727
466
725
313
116 885 314 141 981
983
271 401
406
262
808