Lift Cylinder Repair; 9-7.1. Non-Telescopic; 9-7.2. Telescopic - Big Joe PDI Series Operation Maintenance Manual & Parts List

9-7. LIFT CYLINDER REPAIR.

9-7.1. Non-Telescopic.

NOTE: Removal procedures are covered in
TION 8.
CAUTION: To prevent cylinder damage, use proper
pipe clamp vise. The cylinder will be dis-
torted if the vise is tightened too much.
1. Secure lift cylinder assembly in a vise and remove
gland nut (3, Figure 9-7) with wiper ring (2) and O-
ring (4).
2. Pull out cylinder ram (5).
3. Remove lift cylinder tube (1) from vise.
CAUTION: To prevent damaging the finish on the
ram, use proper pipe clamp vise with
non-marring jaws.
4. Secure ram (5) in vise.
5. Remove nut (11)
6. Cylinders equipped with piston (8), pull off
washers (10 and 13), packing assembly (9), pis-
ton (8) and O-ring (7).
Cylinders equipped with piston (14), pull off
piston (14) and O-ring (7). Remove seal (15) from
piston (14).
NOTE: Cylinders equipped with piston (8), install ret-
rofit kit 907124.
NOTE: Cylinders equipped with piston (14), install
packing kit 907123.
7. Install new O-ring (7), piston (14), new seal (15),
and nut (11) onto cylinder ram (5).
8. Remove cylinder ram (5) from vise.
CAUTION: To prevent cylinder damage, use proper
pipe clamp vise. The cylinder will be dis-
torted if the vise is tightened too much.
9. Secure lift cylinder tube (1) in vise.
10. Install cylinder ram (5) into cylinder tube (1).
11. Install new O-ring (4), and gland nut with new
wiper ring (2).
12. Remove lift cylinder assembly from vise.
PDI0404
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9-7.2. Telescopic.

NOTE: Removal procedures are covered in
TION
SEC-
CAUTION: To prevent cylinder damage, use proper
pipe clamp vise. The cylinder will be dis-
torted if the vise is tightened too much.
1. Secure lift cylinder assembly in a vise and remove
gland nut (3,
ring (4).
2. Pull out cylinder ram (5).
3. Remove lift cylinder tube (1) from vise.
CAUTION: To prevent damaging the finish on the
ram, use proper pipe clamp vise with
non-marring jaws.
4. Secure ram (5) in vise.
5. Remove nut (11).
6. Cylinders equipped with piston (8), pull off
washers (10 and 13), packing assembly (9), pis-
ton (8) and O-ring (7).
Cylinders equipped with piston (14), pull off
piston (14) and O-ring (7). Remove seal (15) from
piston (14).
NOTE: Cylinders equipped with piston (8 or 16),
install retrofit kit 907139.
NOTE: Cylinders equipped with piston (14), install
packing kit 907138.
7. Coat seal (15) and piston (14) liberally with petro-
leum jelly. Install new seal (15) on piston (14).
8. Install new O-ring (7), piston (14), and nut (11)
onto cylinder ram (5).
9. Remove cylinder ram (5) from vise.
CAUTION: To prevent cylinder damage, use proper
pipe clamp vise. The cylinder will be dis-
torted if the vise is tightened too much.
10. Secure lift cylinder tube (1) in vise.
11. Install cylinder ram (5) into cylinder tube (1).
12. Install new O-ring (4) and wiper ring (2) on gland
nut (3).
13. Install gland nut (3) in cylinder tube (1).
14. Remove lift cylinder assembly from vise.
8.
Figure 9-8) with wiper ring (2) and O-
SEC-
9-7