JLG 510AJ Service Manual - Manual (Page 238)

SECTION 5 - HYDRAULICS AND HYDRAULIC SCHEMATICS
5-18 – JLG Lift – 3121181
9. Remove seal (19) from piston (20).
10. Unscrew and remove piston assembly.
11. Remove O-Ring (18) from piston.
12. Remove loosen setscrew (17) and remove spacer (16)
from rod.
13. Remove O-Ring (15) from spacer.
Figure 5-36. Piston And Spacer Disassembly
14. Remove head assembly (10) from rod.
15. Remove O-Ring (12), backup ring (11), and O-Ring (14)
from cylinder head.
16. Remove O-Ring (6), retaining ring (7), wiper (8), and seal
(9) from front inside of cylinder head.
17. Remove two wear rings (13) from rear inside of cylinder
head.
Figure 5-37. Cylinder Head Disassembly
CLEANING AND INSPECTION
1. Clean all parts with approved cleaning solvent.
2. Inspect cylinder rod for scoring, tapering, ovality, or
other damage. Dress rod with Scotch Brite or equivalent.
Replace rod if necessary.
3. Inspect threaded portion of rod for damage. Dress
threads as necessary.
4. Inspect inner surface of cylinder barrel tube for scoring
or other damage. Check inside diameter for tapering or
ovality. Replace if necessary.
5. Inspect threaded portion of barrel for damage. Dress
threads as necessary.
6. Inspect piston surface for damage, scoring, and distor-
tion. Dress piston surface or replace piston.
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 surfaces as necessary.
9. Inspect cylinder head inside diameter for scoring or
other damage, ovality, and tapering. Replace as needed.
10. Inspect threaded portion of head for damage. Dress
threads as necessary.
11. Inspect seal and O-ring grooves in head for burrs and
sharp edges. Dress surfaces as necessary.
12. Inspect cylinder head outside diameter for scoring or
other damage, ovality, and tapering. Replace as needed.
13. Inspect rod bushings. Remove burrs, dirt, or other con-
tamination. Inspect for wear or damage. If steel bushing
is worn or damaged, rod must be replaced.
14. Inspect oil ports for blockage or presence of dirt or other
foreign material. Clean or repair as needed.
19
20
17
18
16
15
12
10
13
9
14
8
7
6 11