Service Manual User Manual
Hydraulic System
9-95
Figure 9– 66. Extend/retract cylinder.
Extend/Retract Cylinder Legend
1. Extend/Retract Cylinder
(includes items 2 through 19)
2. Hytrel Backup Ring
3. O-Ring
4. Piston
5. Setscrew, 5/16-18 UNC x 0.63”
6. Precision Wearband
7. Capped T-Seal, Type 730
8. Rod Spacer
9. O-Ring
10. Backup Ring
11. O-Ring
12. Precision Wearband
13. Deep Z-Seal with Rod Backup
14. Head Gland
15. Locking Insert
16. Heavy-duty Rod Wiper, Sealed OD
17. Weldment Rod
18. Counterbalance Valve, set at 4000 psi (276 bar)
19. Tube
KITS
20. Seal Kit (includes items 2, 3, 6, 7, 9-13, 15, 16)
21. Seal Kit (for item 18)
c. Extend/Retract Cylinder Cleaning
1. Remove all hydraulic fluid, dirt and debris from the
inner surface of the cylinder tube (19, Fig. 9– 66).
2. Discard all seals, backup rings, O-rings, etc. Replace
with new items from a complete seal kit to help
ensure proper cylinder function.
3. Clean all metal parts with an approved cleaning
solvent such as trichlorethylene. Carefully clean
cavities, grooves, threads, etc.
Note: If a white, powdery residue is present on threads
and parts, it can be removed. Clean the residue away
with a soft brass wire brush prior to reassembly, and wipe
with Loctite “T” cleaner before reinstallation.
d. Extend/Retract Cylinder Inspection
1. Inspect internal surfaces and all parts for wear,
damage, etc. If the inner surface of the tube (19,
Fig. 9– 66) does not display a smooth finish, or is
scored or damaged in any way, replace the tube.
Most often, dirty hydraulic fluid causes failure of
internal seals and damage to the smooth surface
within the tube. Remove slight scratches on the
piston, rod, or inner surface of the tube with very fine
grit emery cloth. Use the emery cloth in a rotary
motion to polish out and blend the scratch(es) into
the surrounding surface.
1
2
3
4
5
6
6
7
8
9
10
11
12
13
14
15
16
17
18
18
19
20
21
Apply Loctite #271 and
Torque to 1500-1700 lb/ft.
(2034-2305 Nm)
Torque to 72-82 lb/in.
(8-9 Nm)
Torque to 250-300 lb/ft.
(339-407 Nm)
Torque to
150-160 lb/ft.
(203-217 Nm)
PF0760
PS0600
PF0760
Model 3606 • Origin 10/99