JLG 2658E3 Service Manual - Manual (Page 27)

SECTION 2 - PROCEDURES
3120878 – JLG Lift – 2-15
10. Continue pushing the rod into the barrel until the cyl-
inder guide can be inserted into the cylinder barrel.
11. Using all applicable safety precautions, secure the
cylinder rod assembly with a new retaining ring.
12. Reconnect the hydraulic hoses to the applicable cyl-
inder ports.
2.14 STEER CYLINDER REPAIR
Disassembly
DISASSEMBLY OF THE CYLINDER SHOULD BE PERFORMED ON
A CLEAN WORK SURFACE IN A DIRT FREE WORK AREA.
1. Tag and disconnect the hoses from the cylinder
ports.
DO NOT FU LLY EXTEN D CYLINDER TO END OF STROKE.
RETRACT CYLINDER SLIGHTLY TO AVOID TRAPPING PRES-
SURE.
2. Place the cylinder barrel into a suitable holding fix-
ture.
3. Using a suitable hammer, tap around the outside of
the cylinder barrel and guide to shatter the Loctite.
4. Using a suitable spanner wrench, carefully remove
the guide from the rod Clevis end of the cylinder bar-
rel.
5. Attach a suitable pulling device to the clevis end of
cylinder rod section one.
EXTREME CARE SHOULD BE TAKEN WHEN REMOVING THE CYL-
INDER ROD, GUIDE, AND PISTON. AVOID PULLING THE ROD
OFF-CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON
AND CYLINDER BARREL SURFACES.
6. With the barrel clamped securely, apply pressure to
the rod pulling device and carefully withdraw the
complete rod assembly from the cylinder barrel.
7. Using a suitable hammer, tap around the outside of
the cylinder barrel and guide to shatter the Loctite.
8. Using a suitable spanner wrench, carefully remove
the remaining guide from the cylinder barrel.
Remove and discard the wiper ring, rod seal, back-
up ring and o-ring.
9. Using suitable protection, clamp cylinder rod sec-
tion two in a vise or similar holding fixture.
10. Carefully remove cylinder rod section one from cyl-
inder rod section two and carefully remove the pis-
ton from the cylinder rod. Remove and discard the
piston seal and o-ring .
11. Carefully remove the guide from cylinder rod section
one. Remove and discard the o-ring, back-up ring,
rod seal, and wiper ring.
12. Remove the cylinder rod from the holding fixture.
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 piston surface for damage and scoring and
for distortion. Dress piston surface or replace piston
as necessary.
6. Inspect seal and o-ring grooves in piston for burrs
and sharp edges. Dress applicable surfaces as nec-
essary.
7. Inspect cylinder guide inside diameter for scoring or
other damage and for ovality and tapering. Replace
as necessary.
8. Inspect seal and o-ring grooves in guide for burrs
and sharp edges. Dress applicable surfaces as nec-
essary.
9. Inspect cylinder guide outside diameter for scoring
or other damage and ovality and tapering. Replace
as necessary.
10. Inspect the oil ports for blockage or the presence of
dirt or other foreign material. Repair as necessary.
Assembly
NOTE: Prior to cylinder assembly, ensure that the proper
cylinder seal kit is used. Refer to the Illustrated Parts
Manual.
Apply a light film of hydraulic oil to all components
prior to assembly.
1. Using suitable protection, clamp the cylinder rod
section one in a vise or similar holding fixture.