Jib Lift Down Relief (460Sj Only); Platform Level Up Relief - JLG 400S Service And Maintenance Manual

3. If necessary, loosen jam nut and adjust the Boom Swing
Relief valve clockwise to increase and counterclockwise
to decrease.
NOTE: Boom Swing Right pressure at port 15 and Boom Swing
Left pressure at port 16 is 1600 psi (110 Bar); a gauge may
be placed there for troubleshooting.

Jib Lift Down Relief (460SJ only)

1. Install a pressure gauge at port M34 of the Main Control
Valve capable of reading pressures up to 3000 psi
(207 Bar).
BOTTOM OF MAIN CONTROL VALVE
2. Activate Jib Lift Down function continu-
ously at end of stroke. Observed pres-
sure should be 1200 ± 50 psi (83 ± 4 Bar).
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SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
3. If necessary, loosen jam nut and adjust the Jib Lift Down
Relief valve clockwise to increase and counterclockwise
to decrease.

Platform Level Up Relief

The Platform Level Up relief is set at the vendor and does not
normally need checked or adjusted. If necessary, the following
procedure may be utilized for trouble shooting purposes:
1. Lift the main boom up enough to allow the platform to
be fully leveled up.
2. Activate Level Up to end of stroke.
3. Remove the hose from the Level Up port on the main
control valve (Port 37) - "T" a pressure gauge capable of
reading pressures up to 4000 psi (275 Bar) onto this port
and reconnect the hose.
BOTTOM OF MAIN CONTROL VALVE
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