JLG 600SC Service And Maintenance Manual page 216

8. Loosen setscrew (16) retaining ball (15) in piston (12).
9. Screw piston counterclockwise and remove from rod.
10. Remove and discard O-ring (14) and seal (13).
Figure 5-45. Piston Disassembly
11. Remove rod from holding fixture.
12. Remove cylinder head assembly (3) from rod (2).
13. Remove and discard O-ring (9), backup ring (10), and
O-ring (11) from cylinder head.
14. Remove and discard retaining ring (5), wiper (4), dry
bearing (8), rod seal (7), and backup ring (6) from cylin-
der head (3).
Figure 5-46. Cylinder Head Disassembly
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SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
CLEANING AND INSPECTION
1. Clean parts thoroughly with approved cleaning solvent.
2. Inspect cylinder rod for scoring, tapering, ovality, or
other damage. If necessary, dress rod with Scotch Brite
or equivalent. Replace rod if necessary.
3. Inspect threaded portion of rod for excessive damage.
Dress threads as necessary.
4. Inspect inner surface of cylinder barrel tube for scoring
or other damage. Check inside diameter for tapering or
ovality. Replace if necessary.
5. Inspect threaded portion of barrel for damage. Dress
threads as necessary.
6. Inspect piston surface for damage, scoring, or distortion.
Dress piston surface or replace piston as necessary.
7. Inspect threaded portion of piston for damage. Dress
threads as necessary.
8. Inspect seal and O-ring grooves in piston for burrs and
sharp edges. Dress surfaces as necessary.
9. Inspect cylinder head inside diameter for scoring or
other damage, and for ovality and tapering. Replace as
necessary.
10. Inspect threaded portion of head for damage. Dress
threads as necessary.
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.
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.
5-69