JLG 530LRT, Руководство по обслуживанию и ремонту

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SECTION 4 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
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7. Attach a suitable pulling device to the cylinder rod
port block end or cylinder rod end, as applicable.
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 BAR-
REL SURFACES.
8. With the barrel securely clamped, 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.
NOTE: Step 11 applies only to the steer cylinder.
10. Loosen and remove the nut which attaches the pis-
ton to the rod, and remove the piston.
11. Loosen and remove the cap screw(s), if applicable,
which attach the tapered bushing to the piston.
12. 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.
13. Remove the bushing from the piston.
14. Screw the piston counter-clockwise, by hand, and
remove the piston from cylinder rod.
15. Remove and discard the piston o-rings, seal rings,
and backup rings.
16. Remove piston spacer, if applicable, from the rod.
17. Remove the rod from the holding fixture. Remove
the cylinder head gland and retainer plate, if applica-
ble. Discard the o-rings, back-up rings, rod seals, and
wiper seals.
Cleaning and Inspection
1. Clean all parts thoroughly in an approved cleaning
solvent.
2. Inspect the cylinder rod for scoring, tapering, ovallity,
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 ovallity. 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 neces-
sary.
9. Inspect cylinder head inside diameter for scoring or
other damage and for ovallity and tapering. Replace
as necessary.
Figure 4-26. Cylinder Rod Support
Figure 4-27. Tapered Bushing Removal