JLG 18RS Service Manual - Manual (Page 102)

SECTION 5 - HYDRAULICS
5-12 – JLG Lift – 3121284
9. Loosen and remove the capscrews which attach the
tapered bushing to the piston.
10. Insert the capscrews in the threaded holes in the outer
piece of the tapered bushing. Progressively tighten the
capscrews until the bushing is loose.
11. Remove the tapered bushing from the piston.
12. By hand, screw the piston counterclockwise and remove
it from cylinder rod.
13. Remove and discard the piston o-rings, seal rings, and
backup rings.
14. Remove the rod from the holding fixture. Remove the
cylinder head gland and wiper ring. Discard all seals on
the cylinder head.
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 threaded portion of barrel for damage. Dress
threads as necessary.
6. Inspect piston surface for damage and scoring and for
distortion. Dress piston surface or replace piston as nec-
essary.
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 applicable 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.
Figure 5-14. Tapered Bushing Removal