SECTION 3 - COMPONENT SERVICING
3-14 – JLG Lift – 3121741
Hydraulic System - Pressure and Leak Check
1. Check that the hydraulic oil level is at the FULL
mark on the pump reservoir.
2. Place a pressure gauge on the existing test port
at the hydraulic pressure line from pump to the
cylinder. Gauge must be capable of reading
greater than the set hydraulic pressure.
3. Fully extend and retract the mast through two or
three lift cycles. Recheck the pump reservoir oil
level.
4. Elevate platform to maximum height and check
the pump line pressure while pump is running.
Should be approximately 1100 psi @ normal
operating temperature.
5. Check the lines and fittings for any hydraulic oil
leaks. Repair if needed.
6. Top off the pump reservoir oil level to FULL if
needed.
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