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Repair
Residual hydraulic oil in the cylinder can spray out of
ports during removal of the piston assembly.
NOTE: Be careful not to damage piston rod assem
bly (9).
7. Place a cloth over the hydraulic ports (P). Use a rub
ber mallet to tap piston rod assembly (9) out of cylin
der (1).
Do not clamp vise on this surface.
1
P
NOTICE
To avoid damaging piston rod, do not clamp on pis
ton rod surface.
8. Clamp piston rod flats (9) in a vise to prevent dam
age to piston rod.
9. Use o-ring pick to remove sealing ring and rubber
energizing ring of bidirectional seal (9b). Remove
bearing (9c).
9b
9
9c
10. Thoroughly clean all metal parts in a compatible sol
vent and inspect for wear or damage. Replace as
necessary.
4
9
r_258640_3A0020A_3h
hex
flats
r_258640_3A0020A_4h
Assembly
NOTE: Be careful not to damage piston rod assem
bly (9).
1. Clamp piston rod (9) flats or hex in a vise to prevent
damage to the piston rod.
2. Lubricate piston lead-in (L) with hydraulic oil to
ensure rubber energizing ring of bidirectional seal
(9b) seats properly. Install one edge of rubber ener
gizing ring in deep piston groove and press the rest
of the o-ring down while preventing the o-ring from
twisting.
NOTICE
Prevent rubber energizing ring from twisting during
installation. The bidirectional seal (9b) will not func
tion properly if the rubber energizing ring is twisted.
9b
9c
3. Install sealing ring of bidirectional seal (9b) over rub
ber energizing ring and install bearing (9c) in shal
low piston groove.
NOTICE
Only expand the sealing ring of bidirectional seal
(9b) and bearing (9c) as much as needed to fit over
the piston. Damage will occur when the sealing ring
or bearing are opened wider than necessary.
4. Remove piston assembly (9) from vise and lubricate
bidirectional seal (9b) and bearing (9c) with hydrau
lic oil.
L
9
r_258640_3A0020A_4h
3A0020B
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