Boom Cylinder; Removal - Komatsu PC20R-8 Shop Manual

REMOVAL AND INSTALLATION
REMOVAL OF BOOM CYLINDER
Fully extend the arm and open the bucket comple-
tely. Lower the equipment until it rests on the
ground.
1 - Remove the protection (1) and the relative shoes.
2 - Remove the working beam (2).
3 - Stop the engine, release the pressures in the cylinder
by moving the right-hand PPC valve lever several
times.
4 - Remove the pin (3).
5 - Lower the cylinder (4) until it rests on a stand «A».
6 - Start the engine to retract the piston (5).
H Bind the piston rod with wire to secure the fully re-
tracted position.
7 - Stop the engine and release the residual hydraulic
pressures. (For details, see «20. CONTROLS AND
ADJUSTMENTS»).
7 - Disconnect the tubes (6) and plug them. Also plug the
holes in the cylinder to prevent entry of impurities.
9 - Remove the pin (7).
10 - Remove the cylinder (4).
Boom cylinder: PC20R-8: 20 kg
PC20R-8 PC27R-8
PC27R-8: 25 kg
3
6

BOOM CYLINDER

2
1
4
RKPA3272
5
RKPA3520
7
A
RKPA3530
30-57