TM 9-4940-568-34
2-18
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.
Tension load cell faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Calibration test.
If OSS box length transducer is
more than 6 in. (.5 cm) out of
calibration, OSS will disable
hoist up, boom up and down and
telescope out.
YES
NO
Go to Step 3 of this
Fault.
2.
Is OSS box length transducer
within 6 in. (15 cm) of being
calibrated correctly?
Replace tension load
cell (Para 3-28).
Verify repair, go to
Step 5 of this Fault.
WARNING
Read WARNING
on Page 2-19
