Komatsu F30791, Shop Manual

Page: 241 / 298

REMOVAL OF THE ARM CYLINDER
Lower the working equipment to the ground with all
safety devices engaged. Rest the back of the bucket
on the ground with the arm in a verticalposition.
1 - Stop the engine and release the pressures from the
cylinder by moving the left-hand PPC valve lever sev-
eraltimes.
2 - Place a block «A» beneath the cylinder (1).
3 - Remove the pin (2).
4 - Start the engine and retract the piston rod (3).
H Bind the piston rod with wire to secure the fully re-
tracted position of the piston.
5 - Stop the engine and release any residual hydraulic
pressures. (For details, see «20. CONTROLS AND
ADJUSTMENTS»).
6 - Disconnect the tubes (4) and plug them. Also plug the
holes in the cylinder to prevent the entry of impurities.
7 - Remove the pin (5).
8 - Remove the cylinder (1).
Arm cylinder: PC20R-8: 20 kg
PC27R-8: 28 kg
INSTALLATION OF THE
ARM CYLINDER
.
To install, reverse the removal procedure.
When aligning the positions between the hole and
the pin, turn the engine over at low idling.
Do not insert fingers in the holes to check alignment.
H Adjust the shim thickness so that the clearance be-
tween cylinder and arm is below 1 mm.
Internalbushings: ASL800040
.
Start the engine and bleed the air from the cylinder.
(For details, see «20. CONTROLS AND ADJUST-
MENTS»).
H After bleeding the air, check the oil level in the
tank.
30-59
REMOVAL AND INSTALLATION ARM CYLINDER
PC20R-8 PC27R-8
RKPA3560
RKPA3570
2 3 1
A
RKPA3580
5
1
4
RKP06290
MAX.1mm
MAX.1mm