JLG 80SL, Service Maintenance Manual

Page: 87 / 162

SECTION 4 - HYDRAULICS
3121325 – JLG Lift – 4-7
Assembly
NOTE: Prior to cylinder assembly, ensure that the proper
cylinder seal kit is used. See your JLG Parts Manual
3121326. Always replace seals when servicing cylin-
ders.
Apply a light film of hydraulic oil to all components prior to
assembly.
1. A special tool is used to install a new rod seal into
the applicable cylinder head gland groove.
WHEN INSTALLING PISTON SEALS, ENSURE SEALS ARE
INSTALLED PROPERLY. IMPROPER SEAL INSTALLATION COULD
RESULT IN CYLINDER LEAKAGE AND IMPROPER CYLINDER
OPERATION.
WHEN INSTALLING THE WIPER SEAL, APPLY LOCTITE #609 ON
THE WIPER SEAL IN THREE EVENLY SPACED PLACES TO AID IN
RETENTION OF THE SEAL.
2. Use a soft mallet to tap a new wiper seal into the
applicable cylinder head gland groove. Install a new
rod seal into the applicable cylinder head gland-
groove.
3. Install a new head seal, new o-rings, and, if applica-
ble, a new backup ring, in the appropriate outside
diameter groove of the cylinder head.
4. Carefully install the cylinder head on the rod, ensur-
ing that the wiper, o-ring, and rod seals are not dam-
aged or dislodged. Push the head along the rod to
the rod end, as applicable.
ROD
SEAL
Figure 4-14. Rod Seal Installation
O-Ring
Head
Seal
Wiper
O-Ring
Rod
Seal
Cylinder
Head
Snap Ring
(Outrigger Cylinder Only)
Backup Ring
(Outrigger and Axle
Lockout Cylinders Only)
Figure 4-15. Cylinder Head Seal Installation
Cylinder
Rod
Cylinder
Head
Figure 4-16. Cylinder Head Installation