JLG 600SC Service And Maintenance Manual page 205

SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
11. Inspect seal and O-ring grooves in head for burrs and
sharp edges. Dress applicable surfaces as necessary.
12. Inspect cylinder head outside diameter for scoring,
damage, ovality, and tapering. Replace as necessary.
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 inside of the steel bushing with WD40
prior to bearing installation.
NOTE: Lubrication is not required with nickel plated pins and
bearings. Install pin in composite bushing dry.
d. Press composite bushing into barrel or rod bushing
with correct size arbor.
Figure 5-22. Composite Bushing Installation
14. Inspect travel limiting collar or spacer for burrs and
sharp edges. If necessary, dress inside diameter surface
with Scotch Brite or equivalent.
15. If applicable, inspect port block fittings and holding
valve. Replace as necessary.
16. Inspect oil ports for blockage or presence of dirt or other
foreign material. Repair as necessary.
17. If applicable, inspect piston rings for cracks or other
damage. Replace as necessary.
5-58
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.

Apply a light film of hydraulic oil to all components before
assembly.
1. Support rod in holding fixture.
2. Install retaining ring (16), bearing ring (19), seal (20), and
wiper (22) inside cylinder head (3).
3. Install O-ring (17), backup ring (18), and O-ring (19) on
cylinder head.
4. Slide cylinder head assembly on rod (2) to rod end. Do
not dislodge or damage seals.
20
19
17
18
Figure 5-23. Cylinder Head Assembly
25
3
22
21
16
MAE22310
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