JLG 40xxPS Operator Manual - Manual (Page 155)

Section 8 - Additional Checks
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B. Boom Interlock System Test
(if equipped with boom retracted switch)
Boom interlock system (if equipped with boom retracted switch) operates in three
modes. With boom at any extension and angle below 20 degrees, outrigger and
frame level functions are operable. With boom fully retracted and raised between 20
and 55 degrees, outriggers and frame level are operable. With boom at any
extension and raised above 55 degrees, outriggers and frame level are not operable.
To check the system, perform the following:
1. Test system with machine on a level surface and no load.
2. Shift transmission to neutral and engage park brake.
3. Ensure outriggers and frame level functions are properly functioning. Lower
then raise outriggers. Rotate frame in each direction.
4. Keep outriggers raised and level machine using level in cab.
5. Raise boom to between 20 and 55 degrees and extend approximately
1 m (39 in).
6. Attempt to lower outriggers then rotate frame. Neither function should respond.
7. Fully retract boom and raise above 55 degrees.
8. Attempt to lower outriggers then rotate frame. Neither function should respond.
9. Lower boom fully.
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