TM 9-4940-568-34
2-22
Table 2-7. Crane Troubleshooting (CONT).
1. OVERLOAD SHUTDOWN SYSTEM (OSS) DISABLES CRANE FUNCTIONS,
BOOM UP, BOOM DOWN, TELESCOPE OUT AND HOIST UP (CONT).
Hoist lowers.
Boom telescopes in.
Crane swings.
OSS box out of calibration.
OSS box faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Adjustment test.
If OSS box is out of calibration,
adjusting OSS should bring it
back into calibration. If OSS box
is faulty, it will not be possible to
adjust it back into calibration.
YES
NO
Replace OSS box
(Para 3-27).
Verify repair, go to
Step 5 of this Fault.
3.
Can OSS box be adjusted into
calibration?
Verify repair, go to
Step 5 of this Fault.
WARNING
Read WARNING
on Page 2-23
