Komatsu PC88MR-10 Shop Manual page 1188

50 Disassembly and assembly
Hydraulic system
2. Assembly of piston assembly
1) Set it on tool U4, rotate the handle 8 to 10
turns, and expand it.
2) Compress piston ring (10) by using tool U5.
3) Install wear ring (9).
a Take care not to expand the ring mating
part excessively.
50-160
3. Piston rod assembly
1) Set plunger (8) on the piston rod, install balls
(7) (9 pieces), and secure them with cap (6).
a Make sure that the plunger end has a
certain play.
Only for arm cylinder
2) Install head assembly (2) to piston rod (5).
3) Install piston assembly (6) to piston rod (5).
4) Set piston rod assembly (3) on tool U1.
5) Tighten nut (4) by using tool U3.
Nut (4):
Loctite No. 262
PC88MR-10