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50 Disassembly and assembly
Assembly
a Be careful not to damage the packing, dust
seal and O-ring.
a Clean each part, then cover the piping ports
and pin-inserting hole to prevent dust from
entering them.
a Do not try to force the backup ring into posi-
tion. Warm it in warm water (50 – 60°C) before
installing it.
1.
Disassembly of recoil spring assembly
1)
Press-fit oil seal (20), using tool N5.
2)
Assemble buffer ring (19).
3)
Assemble rod packing (18).
4)
Using tool N6, install dust seal (17) and
then secure it with snap ring (16).
5)
Install backup ring and O-ring (15).
2.
Disassembly of piston assembly
1)
Press-fit oil seal (13), using tool N3.
a Set the piston ring on tool N3, and
t ur n th e h an dl e 8 – 1 0 t im e s t o
expand the ring.
2)
Tighten piston ring (13) by setting tool N4.
PC300, 350-8
3)
Install backup ring and O-ring (14).
4)
Assemble wear ring (12).
5)
Assemble ring (11).
a Be careful not to open the end gap of
the ring too wide.
2
Ring groove: Grease (G2-LI)
3.
Piston rod assembly
1)
Set piston rod assembly (2) on tool.
2)
Assemble head assembly (7).
3)
Assemble collar (6) after installing O-ring
and backup ring to it.
q
Boom and arm cylinder only
4)
Assemble plunger (5).
Boom and arm cylinder only
q
SEN02639-02
21
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Troubleshooting
