JLG 680S, Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
3121234 5-35
NOTE: Install pin into the composite bearing dry. Lubrication is
not required with nickel plated pins and bearings.
12. Inspect spacer for burrs and sharp edges. If necessary,
dress inside diameter surface with Scotch Brite or equiv-
alent.
13. If applicable, inspect port block fittings and holding
valve. Replace if necessary.
14. Inspect the oil ports for blockage or the presence of dirt
or other foreign material. Repair if necessary.
15. If applicable, inspect piston rings for cracks or other
damage. Replace if necessary.
ASSEMBLY
NOTE: Prior to cylinder assembly, ensure that the proper cylinder
seal kit is used. See the respective JLG Parts Manual.
NOTE: 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 NEW SEALS, ENSURE SEALS ARE INSTALLED PROPERLY.
IMPROPER SEAL INSTALLATION COULD RESULT IN CYLINDER LEAKAGE AND
IMPROPER CYLINDER OPERATION.
Figure 5-70. Composite Bearing Installation
Figure 5-71. Rod Seal Installation
WIPER
SEAL
ROD
SEAL
BACKUP
RING
O-RING
WEAR
RING
Figure 5-72. Cylinder Head Seal Installation