Komatsu PC200-8M0 Shop Manual page 1103

500 Hydraulic system
Disassembly and assembly of work equipment cylinder
2. Using a hexagonal wrench (6 mm), remove
lock screw (3) at the end of piston assembly
(4).
a Above operation is common to the boom,
arm and bucket cylinder.
q Screw size: M12 x 1.75 mm (16 mm in
length)
a If screw (3) is caulked too firmly to be
loosened, squeeze the screw further once
and then apply tap (T) to the threaded por-
tion to ease the caulking.
3. Using tool U2, remove piston assembly (4).
a When not using tool U2, use the drilled
holes (H) (f10 mm, two places) to loosen
the piston assembly.
PC200, 200LC, 220, 220LC-8M0
4. Remove plunger (5) and collar (6).
a Only for the arm and boom cylinders
5. Remove cylinder head assembly (7).
6. Remove cap (8) to remove 12 balls (9), and
remove plunger (10).
a Arm cylinder only
Disassembly of piston
1. Remove two rings (11).
2. Remove two wear rings (12).
3. Remove piston ring (13).
4. Remove the O-ring and two backup rings (14).
SEN06146-00
29
50-500