JLG E450A Service And Maintenance Manual page 268

SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
7. Using suitable protection, clamp the cylinder rod in a
vise or similar holding fixture as close to the piston as
possible.
8. Screw the piston counterclockwise, by hand and remove
the piston from cylinder rod.
9. Remove and discard the piston o-rings, seals and wear
rings.
10. Remove bushings from the rod.
11. Remove the rod from the holding fixture. Remove the
cylinder guide gland, Discard the wear ring, backup
rings, o-rings, retaining rings, lip seal, and wiper seal.
5-110
CLEANING AND INSPECTION
1. Clean all parts thoroughly in an approved cleaning sol-
vent.
2. Inspect the 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 piston surface for damage and scoring and for
distortion. Dress piston surface or replace piston as nec-
essary.
6. Inspect threaded portion of piston for damage. Dress
threads as necessary.
7. Inspect seal and o-ring grooves in piston for burrs and
sharp edges. Dress applicable surfaces as necessary.
8. Inspect cylinder Guide inside diameter for scoring or
other damage and for ovality and tapering. Replace as
necessary.
9. Inspect seal and o-ring grooves in guide for burrs and
sharp edges. Dress applicable surfaces as necessary.
10. Inspect cylinder guide outside diameter for scoring or
other damage and ovality and tapering. Replace as nec-
essary.
11. Inspect piston tube for burrs and sharp edges. If neces-
sary, dress inside diameter surface with Scotch Brite or
equivalent.
12. Inspect the oil ports for blockage or the presence of dirt
or other foreign material. Repair as necessary.
13. If applicable, inspect piston rings for cracks or other
damage. Replace as necessary.
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