User's Manual

Repair
4 3A0020A
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).
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).
10. Thoroughly clean all metal parts in a compatible sol-
vent and inspect for wear or damage. Replace as
necessary.
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.
3. Install sealing ring of bidirectional seal (9b) over rub-
ber energizing ring and install bearing (9c) in shal-
low piston groove.
4. Remove piston assembly (9) from vise and lubricate
bidirectional seal (9b) and bearing (9c) with hydrau-
lic oil.
Residual hydraulic oil in the cylinder can spray out of
ports during removal of the piston assembly.
NOTICE
To avoid damaging piston rod, do not clamp on pis-
ton rod surface.
r_258640_3A0020A_3h
91
P
Do not clamp vise on this surface.
r_258640_3A0020A_4h
9c
9b
9
flats
hex
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.
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.
L
r_258640_3A0020A_4h
9c
9b
9