User Manual

SECTION 2 - PROCEDURES
3120884 – JLG Lift – 2-9
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 pos sible.
10. Loosen and remove the cap screw(s), if applicable,
which attach the tapered bushing to the piston.
11. Insert the cap screw(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.
12. Remove the bushing from the piston.
13. Screw the piston CCW, by hand, and remove the
piston from cylinder rod.
14. Remove and discard the piston o-rings, seal rings,
and backup rings.
15. Remove piston spa ce r, if applicable , from the rod.
16. Remove the rod from the holding fixture. Remove
the cylind er head g land an d reta iner plate, if app lica-
ble. Discard the o-rings, back-up rings, rod seals,
and wipe r s eals .
Cleaning an d 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 nec es sary.
4. Inspect inner surface of cylinder barrel tube for scor-
ing or other damage. Check inside diameter for
taperin g or ov ality. Replace if necessary.
5. Inspect thread ed po rtion o f barrel for da mage. 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 appli cable surfaces as nec -
essary.
Figure 2-5. Cylinder Rod Support
Figure 2-6. Tapered Bushing Removal