JLG 80HX_HX+6_HXER Service Manual - Manual (Page 38)

SECTION 2 - PROCEDURES
2-16 – JLG Lift – 3120863
9. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture as close to the piston
as possible.
10. Remove the setscrew(s), if applicable, and nut which
attach the piston to the rod, and remove the piston.
Discard self-locking set screws.
11. Remove the piston rings.
12. Remove and discard the piston o-rings, seal rings,
and backup rings.
13. Remove the setscrew, if applicable, piston spacer,
and wear ring, if applicable, from the rod.
14. Remove the rod from the holding fixture. Remove
the cylinder head gland and retainer, if applicable.
Discard the o-rings, back-up rings, rod seals, and
wiper seals.
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 the rod with
Scotch Brite or an equivalent. Replace the rod if nec-
essary.
3. Inspect the threaded portion of the rod for excessive
damage. Dress the threads as necessary.
4. Inspect the inner surface of the cylinder barrel tube
for scoring or other damage. Check the inside diam-
eter for tapering or ovality. Replace if necessary.
5. Inspect the threaded portion of barrel for damage.
Dress the threads as necessary.
6. Inspect the piston surface for damage and scoring
and for distortion. Dress the piston surface or
replace the piston as necessary.
7. Inspect the seal and o-ring grooves in the piston for
burrs and sharp edges. Dress applicable surfaces
as necessary.
8. Inspect the cylinder head inside diameter for scoring
or other damage and for ovality and tapering.
Replace as necessary.
9. Inspect the seal and o-ring grooves in the cylinder
head for burrs and sharp edges. Dress applicable
surfaces as necessary.
10. If applicable, inspect the cylinder head retainer or
end cap for surface or thread damage. Repair or
replace as necessary.
11. Inspect the cylinder head outside diameter for scor-
ing or other damage and ovality and tapering.
Replace as necessary.
12. If applicable, inspect the thread ring for scoring or
other damage. Dress the threads or applicable sur-
faces as necessary.
13. If applicable, inspect the seal grooves in the thread
ring for burrs and sharp edges. Dress applicable
surfaces as necessary.
14. If applicable, inspect the rod and barrel bushings for
signs of correct lubrication and excessive wear.
Replace as necessary.
15. Inspect the travel limiting collar or spacer for burrs
and sharp edges. If necessary, dress the inside
diameter surface with Scotch Brite or equivalent.
16. If applicable, inspect the port block fittings and hold-
ing valve. Replace as necessary.
17. On the telescope cylinder only, inspect the cylinder
rod support block and wear ring inside diameter for
scoring or other damage. Repair or replace as nec-
essary.
18. Inspect the oil ports for blockage or the presence of
dirt or other foreign material. Repair as necessary.
19. If applicable, inspect piston rings for cracks or other
damage. Replace as necessary.
Figure 2-9. Cylinder Rod Support