Service Manual

SECTION 6 - TROUBLESHOOTING
3121231 – JLG Lift – 6-43
6.14 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 6-49. 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 extend or return line fittings. — Tighten or Replace
Fittings
—
3. Oil leaking around the hydraulic lines. — Tighten or Replace
Hydraulic Lines
—
4. Oil leaking around the lift down valve. — Tighten Cartridge in
Pump Case
—
5. Oil leaking around the (Red) manual descent valve. — Replace Lift Down
Valve
—
Note: Do not overtighten the nut on the solenoid in step 5.