JLG 67SL Service Manual - Manual (Page 81)

SECTION 4 - HYDRAULICS
3121322 – JLG Lift – 4-5
14. If applicable, remove the spacer from the rod.
15. Remove the rod from the holding fixture.
16. Remove the cylinder head from the cylinder rod.
17. If applicable, remove and discard the cylinder head
seal, rod seal, wiper, o-ring(s), back-up ring, and
snap ring.
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 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. If applicable, 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 nec-
essary.
9. Inspect cylinder head inside diameter for scoring or
other damage and for ovality and tapering. Replace
as necessary.
10. Inspect threaded portion of head for damage. Dress
threads as necessary.
Spacer
Cylinder
Rod
Figure 4-9. Spacer Removal
Cylinder
Rod
Cylinder
Head
Figure 4-10. Cylinder Head Removal
O-Ring
Head
Seal
Wiper
O-Ring
Rod
Seal
Cylinder
Head
Snap Ring
(Outrigger Cylinder Only)
Backup Ring
(Outrigger Cylinder Only)
Figure 4-11. Cylinder Head Seals