JLG 80SL Service Manual - Manual (Page 86)

SECTION 4 - HYDRAULICS
4-6 – JLG Lift – 3121325
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.
11. Inspect seal and o-ring grooves in head for burrs
and sharp edges. Dress applicable surfaces as nec-
essary.
12. Inspect cylinder head outside diameter for scoring
or other damage and ovality and tapering. Replace
as necessary.
13. If applicable, inspect rod and barrel bushings for
signs of excessive wear or damage. Replace as nec-
essary.
a. Thoroughly clean bushing housing, of burrs, dirt
etc. to facilitate bearing installation.
b. Inspect bushing housing for wear or other dam-
age. If the bushing housing is worn or damaged,
rod/barrel must be replaced.
c. Lubricate inside of bushing housing with WD40
prior to bushing installation.
d. Using an arbor of the correct size, carefully
press the bushing(s) into bushing housing on
the cylinder rod and cylinder barrel, if applica-
ble.
NOTE: Step 14 applies only to the Lift Cylinder and Axle
Lockout Cylinder.
14. Inspect lift/lower valve and load check valve.
Replace as necessary.
15. Inspect the oil ports for blockage or the presence of
dirt or other foreign material. Repair as necessary.
16. If applicable, inspect piston rings for cracks or other
damage. Replace as necessary.
Bushing
Arbor
Tool
Bushing
Housing
Figure 4-13. Bushing Installation