JLG 510AJ Service Manual - Manual (Page 250)

SECTION 5 - HYDRAULICS AND HYDRAULIC SCHEMATICS
5-30 – JLG Lift – 3121181
8. Remove two wear rings (10) from piston/rod assembly
(12).
9. Remove seal (11) from piston. Do not damage piston
groove.
NOTE: Piston seal is a combination-type seal. If seal separates it
cannot be reused.
Figure 5-65. Piston Seal and Wear Ring
10. Remove wiper (4), seal (5), O-ring (2) and retaining ring
(3) from two cylinder heads (6).
11. Remove O-ring (8), backup ring (7) and O-ring (9).
Figure 5-66. Cylinder Head Disassembly
CLEANING AND INSPECTION
1. Clean all parts in an approved cleaning solvent.
2. Inspect cylinder rod for scoring, tapering, ovality, or
other damage. If necessary, dress rod with Scotch Brite™
or equivalent. Replace rod if necessary.
3. Inspect inner surface of cylinder barrel tube for scoring,
tapering, ovality, or other damage. Replace if necessary.
4. Inspect threaded portion of barrel for damage. Dress
threads as necessary.
5. Inspect piston surface for damage and scoring and for
distortion. Inspect seal and O-ring grooves in piston for
burrs and sharp edges. Dress piston surfaces or replace
rod assembly as necessary.
6. Inspect cylinder head inside diameter for scoring, taper-
ing, ovality, or other damage. Replace as necessary.
7. Inspect threads, and seal and O-Ring grooves in head for
burrs, sharp edges, and other damage. Dress surfaces as
necessary.
8. Inspect oil ports for blockage or contamination. Repair
as necessary.
12
10
10
11
6
2
3
4
5
9
8
7