JLG 3246E2 ANSI Service Manual - Manual (Page 23)

SECTION 2 - PROCEDURES
3120737 – JLG Lift – 2-9
1. Attach a suitable pulling device to the cylinder rod
end.
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.
2. With the barrel clamped securely, apply pressure to
the rod pulling device and carefully withdraw the
complete rod assembly from the cylinder barrel.
3. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture.
4. Carefully remove the piston locknut and piston from
the cylinder rod. Remove and discard the piston ring
and o-rings.
5. Carefully remove the guide from the cylinder rod.
Remove and discard the o-ring, back-up ring, rod
seal, and wiper ring.
6. 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.
1. Locknut
2. Piston
3. O - Ring
4. Seal, Piston
5. O - Ring
6. Barrel
7. Guide
8.O - Ring
9. Ring, Back-up
10. Z-Seal
11. Ring, Retaining
12. Wiper
13. Rod
Figure 2-5. Brake Cylinder Assembly