JLG 1500SJ Service Manual - Manual (Page 357)

SECTION 5 - HYDRAULICS
3121262 – JLG Lift – 5-5
9. Loosen and remove the capscrew 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 washer ring. Discard all
seals on the cylinder head.
CLEANING AND INSPECTION
1. Clean all parts thoroughly in an approved cleaning
solvent.
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 dam-
age. Dress threads as necessary.
4. Inspect inner surface of cylinder barrel tube for scor-
ing 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 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 applicable surfaces as nec-
essary.
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 nec-
essary.
Figure 5-5. Tapered Bushing Removal