JLG 2658E3 Service Manual - Manual (Page 20)

SECTION 2 - PROCEDURES
2-8 – JLG Lift – 3120878
EXTREME CARE SHOULD BE TAKEN WHEN REMOVING THE CYL-
INDER ROD, HEAD, AND PISTON. AVOID PULLING THE ROD OFF-
CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON AND
CYLINDER BARREL SURFACES.
8. With the barrel clamped securely, apply pressure to
the rod pulling device and carefully withdraw the
complete rod assembly from the cylinder barrel.
9. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture as close to the piston
as possible.
10. If applicable, loosen and remove the nut which
attaches the piston to the rod, then remove the pis-
ton from the rod.
11. If applicable, loosen and remove the cap screw(s)
securing the tapered bushing to the piston.
12. Insert the capscrew(s) in the threaded holes in the
outer piece of the tapered bushing. Progressively
tighten the cap screw(s) until the bushing is loose
on the piston, then remove the bushing from the pis-
ton.
13. Screw the piston counter-clockwise, by hand, and
remove the piston from the cylinder rod.
14. Remove and discard the piston o-rings, back-up
rings, guidelock rings and hydrolock seals.
15. If applicable, remove the piston spacer from the rod.
16. Remove the rod from the holding fixture. Remove
the cylinder head and retainer plate from the rod.
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 damage. 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.
Figure 2-4. Capscrew Removal
Figure 2-5. Rod Support
Figure 2-6. Tapered Bushing Removal