JLG 450A_AJ Series II Service Manual - Manual (Page 290)

SECTION 5 - HYDRAULICS
5-50 – JLG Lift – 3121290
ASSEMBLY
NOTE: Apply a light film of hydraulic oil to all components before
assembly.
1. Position cylinder barrel in a suitable holding fixture.
IMPROPER SEAL INSTALLATION CAN CAUSE CYLINDER LEAKS AND IMPROPER
CYLINDER OPERATION.
2. Install Rod Seal (5) in Cylinder Head (3).
3. Press-in Bearing (6).
4. Install Wiper (4).
5. Install O-Ring (7), Backup Ring (8), and O-Ring (9).
6. Repeat for other Cylinder Head.
Figure 5-102. Cylinder Head Assembly
7. Install wear ring (11) in piston groove.
8. Install seal (10) in piston groove.
Figure 5-103. Piston Seal and Wear Ring
INSERTING ROD OFF-CENTER CAN DAMAGE PISTON AND CYLINDER BARREL
SURFACES. USE EXTREME CARE INSTALLING CYLINDER ROD AND PISTON.
9. Install Cylinder Head (3) on one end of Barrel (1).
10. Insert Rod Assembly (2) in Barrel (1) until end of Rod is
through Cylinder Head (3).
11. Install remaining Cylinder Head (3) to Barrel (1).
Figure 5-104. Steering Cylinder Assembly
12. Tighten two Cylinder Heads (3) with Hook Spanner to
397 ft-lb (538 Nm).
Figure 5-105. Cylinder Head Torque