JLG 20VP (3120728) Service Manual - Manual (Page 101)

SECTION 3 - TROUBLESHOOTING
3120728 – JLG Lift – 3-41
3.10 HYDRAULIC LEAK TROUBLESHOOTING
Miscellaneous Hydraulic Leak Troubleshooting
Overview Of Procedure
This series of steps gives remedies for various areas of the machine where leaks could occur.
Table 3-31. Hydraulic Leak Troubleshooting
STEP ACTION SPEC YES NO
1. Oil leaking around the lift cylinder rod.
—
Replace the Seal
at the end of the
Piston and
Cylinder Barrel
—
2. Oil leaking around the cylinder fitting/flow valve.
—
Tighten or
Replace Fittings
—
3. Oil leaking around the hydraulic lines.
—
Tighten or
Replace
Hydraulic Lines
—
4. Oil leaking around the lift up valve.
—
Tight Cartridge in
Pump Case
—
5. Oil leaking around the lift down valve.
—
Tighten Cartridge
in Pump Case
—
6. Oil leaking around the (Red) manual descent valve.
—
Replace Lift
Down Valve
—
Note: Do not overtighten the nut on the solenoid in steps 4, 5, and 6.