JLG 40xxPS Operator Manual - Manual (Page 154)

Section 8 - Additional Checks
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8.3 BOOM INTERLOCK
A. Boom Interlock System Test
Boom interlock system operates in two modes. With boom angle below 20 degrees,
outrigger and frame level functions are operable. With boom raised above 20
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 above 20 degrees.
6. Attempt to lower outriggers then rotate frame. Neither function should respond.
7. Lower boom fully.
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