JLG T500J, Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
5-16 3121200
13. If applicable, inspect rod and barrel bearings for signs of
correct excessive wear or damage. Replace as necessary.
a. Thoroughly clean hole, (steel bushing) of burrs, dirt
etc. to facilitate bearing installation.
b. Inspect steel bushing for wear or other damage. If
steel bushing is worn or damaged, rod/barrel must
be replaced.
c. Lubricate inner side of the steel bushing prior to
bearing installation.
d. Press composite bushing into barrel or rod bushing
with correct size arbor.
NOTE: Lubrication is not required with nickel plated pins and
bearings. Install pin in composite bushing dry.
14. If applicable, inspect port block fittings and holding
valve. Replace as necessary.
15. Inspect oil ports for blockage or presence of dirt or other
foreign material. Repair as necessary.
16. If applicable, inspect piston rings for cracks or other
damage. Replace as necessary.
ASSEMBLY
INCORRECT SEAL INSTALLATION CAN CAUSE CYLINDER LEAKS AND IMPROPER
C YLINDER OPERATION. ENSURE ALL PISTON SEALS ARE CORREC TLY
INSTALLED. REFER TO CROSS SECTION ILLUSTRATIONS FOR CORRECT SEAL
ORIENTATION.
NOTE: Use proper cylinder seal kit for cylinder assembly. See your
JLG Parts Manual.
NOTE: Apply a light film of hydraulic oil to all components before
assembly.
1. Install rod seal (9), wiper seal (11) and wear ring (10)
inside the cylinder head.
2. Install o-ring (12) on cylinder head.
3. Install backup ring (13) on cylinder head.
4. Slide cylinder head assembly onto rod (2). Do not dis-
lodge or damage seals.
5. Support rod in holding fixture.
6. Install backup rings (8) and o-ring (7) inside the piston
assembly.
Figure 5-17. Composite Bushing Installation
MAE29240
13
12
10
9
1
11
Figure 5-18. Cylinder Head Assembly