JLG 600SC_660SJC Service Manual - Manual (Page 91)

SECTION 5 - HYDRAULICS
3120898 – JLG Lift – 5-5
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. See your JLG Parts Manual.
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.
IMPORTANT
WHEN INSTALLING ‘POLY-PAK’ PISTON SEALS, ENSURE SEALS
ARE INSTALLED PROPERLY. REFER TO WIPER SEAL INSTALLA-
TION FOR CORRECT SEAL ORIENTATION. IMPROPER SEAL
INSTALLATION COULD RESULT IN CYLINDER LEAKAGE AND
IMPROPER CYLINDER OPERATION.
IMPORTANT
WHEN INSTALLING THE WIPER SEAL ON THE LOWER (TOWER)
LIFT CYLINDER, 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
wear ring into the applicable cylinder head gland
groove.
Figure 5-6. Rod Seal Installation
Figure 5-7. Poly-Pak Piston Seal Installation
Figure 5-8. Wiper Seal Installation