Service Manual User Manual

Hydraulic System
9-97
Figure 9– 67. Hoist/lower cylinder.
Hoist/Lower Cylinder Legend
1. Hoist/Lower Cylinder with Bearing
(includes items 2 through 18)
2. Counterbalance Valve, set at 4000 psi (276 bar)
3. Tube
4. Lock Nut, 2.00 - 12 UN
5. Precision Wearband
6. Piston
7. Capped T-Seal
8. O-Ring
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. Self-aligning Bearing
18. Weldment Rod
19. Self-tapping Lube Fitting, 1/8 NPT
KITS
20. Seal Kit (includes items 5, 7-13, & 15, 16)
21. Seal Kit (for item 2).
9.10.4 Hoist/Lower Cylinder
The hoist/lower cylinder (1, Fig. 9– 67) is anchored to the
underside of the outer boom and to the vehicle frame.
a. Hoist/Lower Cylinder Removal
1. Park the vehicle on a firm, level surface, fully retract
all hydraulic cylinders, ground the attachment (if any),
place the travel select lever in NEUTRAL (N), engage
the park brake switch and shut the engine OFF.
2. Unlatch, unlock and open the engine cover. Allow the
hydraulic fluid to cool.
3. Raise and support the boom to allow removal of the
hoist/lower cylinder (1, Fig. 9– 67). Label or otherwise
mark the hoist/lower cylinder hydraulic hoses.
Disconnect and cap all hoses and fittings.
E
E
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
5
6
7
8
9
10
11
12
13
14
15
15
16
18
20
21
Apply Loctite #271 (red)
and Torque to
1550-1750 lb/ft.
(2102-2373 Nm)
Torque to 45-50 lb/ft
(61-68 Nm)
Torque to 300-400 lb/ft
(407-542 Nm)
17
Hoist Cylinder
Orient Fracture In
Bearing Race at Clock
Position Shown
19
PF0760
PS0590
PF0760
WARNING: Hot hydraulic fluid can cause
severe burns. Wait for hydraulic fluid to cool
before servicing any hydraulic component.
WARNING: Escaping hydraulic fluid under
pressure can penetrate the skin, causing seri-
ous injury. Relieve hydraulic pressure before
servicing any hydraulic component.
Model 3606 • Origin 10/99