Piston Disassembly - JLG T500J Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
REMOVE SEALS USING A BRASS OR PLASTIC PICK ONLY. DO NOT USE A KNIFE,
SHARP OBJECT, OR SCREW DRIVER. NOTE SEAL ORIENTATION BEFORE REMOV-
ING FOR PROPER INSTALLATION.
8. Remove locknut (6) from rod(2).
9. Screw piston counterclockwise and remove from rod.
10. Remove and discard piston seal (8) and wear ring (7)
from piston (3).
11. Remove and discard o-ring (9) from piston.
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8
Figure 5-34. Piston Disassembly
12. Remove spring (5) and spacer (15) from rod.
13. Remove rod from holding fixture.
14. Remove cylinder head assembly (4) from rod (2).
15. Remove and discard o-rings (10 & 12) and seal (11) from
cylinder head (4).
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16. Remove and discard rod seal (13) and wiper seal (14)
from head assembly.
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11
Figure 5-35. Cylinder Head Disassembly
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.
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