SECTION 2 - PROCEDURES
3120743
– JLG Lift –
2-23
12.
Remove and discard the o-rings, seal rings and
backup rings.
13.
Remove the rod from the holding fixture. Remove
the cylinder head gland if applicable. Discard the o-
rings, back-up rings, rod seals, and wiper seals.
Cleaning and Inspection.
14.
Clean all parts thoroughly in approved solvent.
15.
Inspect the cylinder rod for scoring, tapering, ovality,
or other damage. If necessary, dress rod with
Scotch-Brite or equivalent. Replace rod if necessary.
16.
Inspect threaded portion of rod if applicable for
excessive damage. Dress threads as necessary.
17.
Inspect inner surface of cylinder barrel tube for scor-
ing or other damage. Check inside diameter for
tapering or ovality. Replace if necessary.
18.
Inspect threaded portion of barrel for damage. Dress
threads as necessary.
19.
Inspect piston surface for damage and scoring and
for distortion. Dress or replace piston as necessary.
20.
Inspect seal and o-ring grooves in piston for burrs
and sharp edges. Dress applicable surfaces as nec-
essary.
21.
Inspect cylinder head(s) inside diameter for scoring
or other damage and ovality and tapering. Replace
as necessary.
22.
Inspect seal and o-ring grooves in head(s) for burrs
and sharp edges. Dress applicable surfaces as nec-
essary.
23.
If applicable, inspect cylinder head retainer(s) or end
cap(s) for surface or thread damage. Repair or
replace as necessary.
24.
Inspect cylinder head(s) outside diameter for scor-
ing or other damage and ovality and tapering.
Replace as necessary.
25.
If applicable, inspect rod and barrel bushing for
signs of correct lubrication and excessive wear.
Replace as necessary.
26.
Inspect travel limiting collar or spacer(s) for burrs
and sharp edges. If necessary, dress inside diame-
ter surface with Scotch Brite or equivalent.
27.
If applicable, inspect port block fittings and holding
valve. Replace as necessary.
28.
Inspect the oil ports for blockage or other presence
of dirt or other foreign material. Repair as necessary.
Assembly.
NOTE:
Prior to cylinder assembly, ensure that the proper
cylinder seal kit is used. See your JLG Parts Manual.
Apply a light film of hydraulic oil to all components
prior to assembly.
1.
Place a new wiper seal and rod seal into the applica-
ble cylinder head gland(s) grooves.
2.
Using a soft mallet, tap a new wiper seal into the
applicable cylinder head gland grooves. Install a
new wear ring into applicable cylinder head gland
groove.
Figure 2-14. Removal of Seals and O-Rings.
Figure 2-15. Removal of Piston Seals.
Figure 2-16. Rod Seal Installation.
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