Steer Relief; Jib Lift (Up And Down) Relief; Releveling Valve Relief - JLG E450A Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS

Steer Relief

1. With pressure gauge at "G" port on steer/brake valve,
activate and bottom out Steer Left or Right.
2. Adjust Steer Relief to value given in Figure 5-148., Steer
Valve Pressure Adjustment.
3. Shut down hydraulic system and remove pressure
gauge.

Jib Lift (Up and Down) Relief

1. Install the pressure gauge at the at the "G" port on the
Main Control valve, activate and bottom out jib up or
down.

Releveling Valve Relief

1. Install a pressure gauge at port "G" on the main valve.
2. Adjust the lower lift down pressure relief to the value
given in Figure 5-151., Main Valve Pressure Adjustment.
3. With the lower boom lowered all the way, pull the red
releveling knob and activate lower lift down.
5-132
4. Adjust the releveling pressure relief to the value given in
Figure 5-151., Main Valve Pressure Adjustment. Turning
clockwise increases the pressure and turning counter-
clockwise decreases pressure. The relief valve is located
directly below the red releveling knob.
JIB RELIEF
JIB VALVE
Figure 5-146. Jib Valve Location
MAE32900
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