Re-Synchronize Upright - JLG 800AJ HC3 Operation & Safety Manual

Machine Operation

4.21 RE-SYNCHRONIZE UPRIGHT

4.21.1 Releveling Valve
A pull type control valve allows the operator to adjust the upright level cylinder if the
upright is not 90° (vertical) relative to the chassis (Refer to Figure 2.9 and Figure 2.10).
This valve is located in the tank compartment area.
Perform the following steps with the aid of an assistant:
1. Turn the key switch to the ground control position.
2. Start the engine.
3. Pull and hold the red relevel knob located next to the main control valve. Refer to
Figure — Re-leveling Valve, page
4. Raise the tower boom 6 feet (1.8 m).
5. Release the red re-level knob.
6. Lower the tower boom fully and continue to hold down the switch to Tower
Down for an additional 20 seconds.
7. Repeat steps 3 through 6 as necessary until the upright is 90° (vertical) relative to
the chassis.
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31222411 800AJ HC3