Platform Level Down Relief - JLG 400S Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
4. Activate Main Boom Lift Down function using Auxiliary
Mode continuously until fully lowered. Observed pres-
sure should be 3200 ± 80 psi (220 ± 6 Bar).
5. If necessary, loosen jam nut and adjust the Platform
Level Up Relief valve clockwise to decrease and counter-
clockwise to increase.
6. Remove "T" and the gauge and reinstall the hose.

Platform Level Down Relief

The Platform Level Down relief is set at the vendor and does
not normally need checked or adjusted. If necessary, the fol-
lowing procedure may be utilized for trouble shooting pur-
poses:
1. Lift the main boom up enough to allow the platform to
be fully leveled down.
2. Activate Level Down to end of stroke.
5-92
3. Remove the hose from the Level Down port on the main
control valve (Port 38) - "T" a pressure gauge capable of
reading pressures up to 3000 psi (207 Bar) onto this port
and reconnect the hose.
BOTTOM OF MAIN CONTROL VALVE
4. Activate Platform Level Down function
continuously at end of stroke. Observed
pressure should be 2000 ± 50 psi (138 ± 4
Bar).
5. If necessary, loosen jam nut and adjust the Platform
Level Down Relief valve clockwise to decrease and coun-
ter-clockwise to increase.
6. Remove "T" and the gauge and reinstall the hose.
3121671