Komatsu PC88MR-10 Shop Manual page 1187

3) Remove piston assembly (6) from piston rod
(5).
4) Remove head assembly (2).
5) Remove cap (6), pull out balls (7) (9 pieces),
and remove plunger (8).
Only for arm cylinder
a Since cap (6) is made of nylon, screw in a
screw, etc. and pull the cap by using
pliers.
3. Disassemble piston assembly
1) Remove wear ring (9).
2) Remove piston ring (10).
a Set a driver, etc. to the piston ring, and
tap it by using a hammer to cut and
remove it.
PC88MR-10
50 Disassembly and assembly
4. Disassemble cylinder head assembly
1) Remove the O-ring and backup ring (11).
2) Remove O-ring (12).
3) Remove snap ring (13), and remove dust
seal (14).
4) Remove rod packing (15).
5) Remove bushing (16).
Assembly
(PC88MR-PPZ0-710-K-00-A)
a Apply engine oil to the sliding surface of each
part, and take care not to damage the packing,
dust seals, O-rings, etc..
a When installing the backup ring, do not install it
forcibly. Warm it in hot water at approximately 50
to 60 deg., and install it.
1. Assembly of cylinder head assembly
1) Press-fit bushing (16) by using tool U6.
2) Install rod packing (15).
3) Install dust seal (14) and secure it with snap
ring (13) by using tool U7.
4) Install the backup ring and O-ring (11).
5) Install O-ring (12).
Hydraulic system
50-159