Komatsu Galeo PC800-8 Shop Manual page 1045

50 Disassembly and assembly
2. Assembly of piston assembly
1) Using tool U2, expand piston ring (13).
a Set the piston ring on tool U2, and
t ur n th e h an dl e 8 – 1 0 t im e s t o
expand the ring.
2) Set tool U3 in position, and compress pis-
ton ring (13).
3) Install O-ring and backup ring (14). (Only
for boom, bucket cylinder)
4) Assemble wear rings (12).
5) Assemble rings (11).
a Be careful not to open the end gap of
the ring too wide.
2
Ring groove: Grease (G2-LI)
PC800, 850-8
3. Piston rod assembly
1) Set piston rod assembly (2) to tool U1.
2) Assemble head assembly (7).
3) Fit O-ring and backup ring to collar (6),
then assemble.
4) Assemble plunger (5).
a After tightening the piston, check that
the plunger has a little play.
5) Set cushion plunger (10) to piston rod,
then assemble 11 balls (9), and secure
with cap (8).
Applicable to arm cylinder
q
a After installing, check that the cushion
plunger end has a little play.
SEN01057-01
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