JLG sky trak mmv Service Manual page 340

Hydraulic System
Before troubleshooting any hydraulic circuit, ALWAYS begin by checking the following:
1. Hydraulic oil level in the reservoir
2. All hoses, tubes, fittings for leaks, kinks, interference, etc.
3. Air in the lines
Refer to Section 11.4, Stabil-TRAK™ Circuit Operation
and Troubleshooting for information on troubleshooting
the frame sway and stabilizer circuits.
9.42
NOTE:
When checking pressures in
circuits, refer to Section 9.7,
Hydraulic System Testing for
correct pressure readings.
Model MMV Rev. 12/04