JLG 450A_AJ Series II Service Manual - Manual (Page 286)

SECTION 5 - HYDRAULICS
5-46 – JLG Lift – 3121290
4. Using suitable protection, clamp cylinder rod in a vise or
similar holding fixture as close to piston as possible.
5. Carefully thread piston on cylinder rod hand tight.
Ensure O-ring and back-up rings are not damaged or
dislodged.
NOTE: Piston and mating end of rod must be free of oil when
installing tapered bushing.
6. Thread piston on rod until tight. Install tapered bushing.
APPLY JLG THREAD LOCKING COMPOUND P/N 0100011 TO TAPERED BUSHING
BOLTS WHEN REBUILDING MASTER, SLAVE, LIFT, AND TELESCOPE CYLINDERS.
TORQUE TO SPECIFICATIONS.
7. Install bolts in tapered bushing using JLG Thread Lock-
ing Compound P/N 0100011. Torque to 5 ft-lb (6 Nm).
Figure 5-93. Tapered Bushing Installation
8. Remove cylinder rod from holding fixture.
9. Place new guide locks and seals in applicable outside
diameter grooves of cylinder piston.
10. Position cylinder barrel in a suitable holding fixture.
INSERTING ROD OFF-CENTER CAN DAMAGE PISTON AND CYLINDER BARREL SURFACES.
USE EXTREME CARE WHEN INSTALLING CYLINDER ROD, HEAD, AND PISTON.
11. Clamp barrel clamped securely and support rod. Insert
piston end into barrel cylinder. Do not damage or dis-
lodge piston loading O-ring and seal ring.
12. Continue pushing rod into barrel until cylinder head can
be inserted into barrel cylinder.
13. Screw in cylinder head until tight and mark is aligned on
barrel.
14. Apply locking primer and locking compound to eight
socket head bolts. Install in cylinder head and barrel.
Torque to 50-55 ft-lb (68-75 Nm).
Figure 5-94. Rod Assembly Installation