JLG 2658E3 Service Manual - Manual (Page 21)

SECTION 2 - PROCEDURES
3120878 – JLG Lift – 2-9
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 bearings for
signs of correct lubrication and excessive wear. If
necessary, replace bearings as follows:
a. Thoroughly clean steel bushing hole of burrs,
dirt, etc. to facilitate bearing installation.
b. Inspect steel bushing for wear or other damage.
If steel bushing is worn or damaged, rod or bar-
rel (as applicable) must be replaced.
c. Lubricate inside of steel bushing with WD-40
prior to bearing installation.
d. Using arbor of the correct size, carefully press
the bearing into the steel bushing.
NOTE: Install the cylinder pin into the OIl-lite bearing dry.
Lubrication is not required with chrome pins and
bearings.
14. Inspect travel limiting collar or spacer for burrs and
sharp edges. If necessary, dress inside diameter
surface with Scotch Brite or equivalent.
15. If applicable, inspect port block fittings and holding
valve. Replace as necessary.
16. Inspect the oil ports for blockage or the presence of
dirt or other foreign material. Repair as necessary.
17. If applicable, inspect piston rings for cracks or other
damage. Replace as necessary.
Assembly
NOTE: Prior to cylinder assembly, ensure that the proper
cylinder seal kit is used.
Apply a light film of hydraulic oil to all components
prior to assembly.
1. Using a special tool, pictured in the following illustra-
tion, install a new rod seal into the applicable cylin-
der head gland groove. Refer to the following
illustration for the proper tool size.
WHEN INSTALLING NEW “POLY-PAK” TYPE PISTON SEALS,
ENSURE SEALS ARE INSTALLED PROPERLY. REFER TO FIGURE
2-13., POLY-PAK PISTON SEAL INSTALLATION FOR CORRECT
SEAL ORIENTATION. IMPROPER SEAL INSTALLATION COULD
RESULT IN CYLINDER LEAKAGE AND IMPROPER CYLINDER
OPERATION.
2. Using a soft mallet, tap a new wiper seal into the
applicable cylinder head gland groove. Install a new
wear ring into the applicable head gland groove.
3. Place a new o-ring and back-up seal in the applica-
ble outside diameter groove of the cylinder head.
4. Install a washer ring onto the rod, then carefully
install the head gland on the rod, ensuring that the
wiper and rod seals are not damaged or dislodged.
Push the head along the rod to the rod end, as
applicable.
5. Carefully slide the piston spacer onto the rod.
6. If applicable, correctly place a new o-ring and back-
up rings in the inner piston diameter groove.
Figure 2-7. Oil-lite Bearing Installation
Figure 2-8. Rod Seal Installation
Figure 2-9. Wiper Seal Installation