Komatsu PC20R-8 Shop Manual page 243

REMOVAL AND INSTALLATION
REMOVAL OF THE BOOM SWING CYLINDER
Swing the work equipment approx. 45ë to the left
and extend completely the boom swing 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 vertical position.
1 - Stop the engine and move the command pedal boom
swing cylinder several times to release residual pres-
sures.
2 - Remove the pin (1) and disengage the piston rod (2)
from swing support (3).
3 - Start the engine and retract the piston rod (4) comple-
tely.
H Bind the piston rod with wire to secure the fully re-
tracted position.
4 - Stop the engine and move the command pedal boom
swing cylinder several times to release residual pres-
sures. (For details, see «20. CONTROLS AND AD-
JUSTMENTS»).
5 - Only for cab version.
Remove the cab floor (4). (For details, see «RE-
MOVAL OF CAB»).
6 - Remove the accumulator (5).
H Disconnect first the negative terminal (±) and then
the positive terminal (+).
7 - Disconnect the hoses (4) and plug them. Also plug
the holes in the cylinder to prevent the entry of impu-
rities.
PC20R-8 PC27R-8
BOOM SWING CYLINDER
2
5
6
RKPA3610
3
1
RKPA3620
4
RKPA3411
7
RKPA3630
30-61