Cleaning And Inspection - JLG 1200SJP Service Maintenance Manual

SECTION 5 - HYDRAULICS
EXTREME CARE SHOULD BE TAKEN WHEN REMOVING THE CYLINDER ROD,
HEAD, AND PISTON. AVOID PULLING THE ROD OFF-CENTER, WHICH COULD
CAUSE DAMAGE TO THE PISTON AND CYLINDER BARREL SURFACES.
7. With the barrel clamped securely, apply pressure to the
rod pulling device and carefully withdraw the complete
rod assembly from the cylinder barrel.
Figure 5-11. Cylinder Rod Support
8. Using suitable protection, clamp the cylinder rod in a
vise or similar holding fixture as close to the piston as
possible.
NOTE: Step 9 applies only to the steer cylinder.
9. Loosen and remove nut which attaches the piston to the
rod, and remove the piston.
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.
5-12
Figure 5-12. Tapered Bushing Removal
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 spacer, if applicable, from the rod.
16. Remove the rod from the holding fixture. Remove the
cylinder head gland and retainer plate, if applicable. Dis-
card the o-rings, back-up rings, rod seals, and wiper
seals.

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.
– JLG Lift – 3121142