JLG E450A Service And Maintenance Manual page 257

7. Using suitable protection, clamp the cylinder rod in a
vise or similar holding fixture as close to the piston as
possible.
8. Remove the retainer from the cylinder rod.
9. Screw the piston counterclockwise, by hand and remove
the piston from cylinder rod.
10. Remove and discard the piston o-rings, seals and wear
rings.
11. Remove piston spacer from the rod.
12. Remove the rod from the holding fixture. Remove the
cylinder head gland. Discard the o-rings, backup rings,
rod seals, and wiper seals.
3121714
SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
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 head inside diameter for scoring or
other damage and for ovality and tapering. Replace as
necessary.
9. Inspect seal and o-ring grooves in head for burrs and
sharp edges. Dress applicable surfaces as necessary.
10. Inspect cylinder head outside diameter for scoring or
other damage and ovality and tapering. Replace as nec-
essary.
11. 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 steel bushing prior to bearing
installation.
d. Using an arbor of the correct size, carefully press the
bearing into steel bushing.
5-99