TM 9-4940-568-34
2-26
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.
Harness faulty.
Wire faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
If harness is faulty, 22 to 28 vdc
will be input to crane junction
box terminal 18.
YES
NO
Repair white wire
(see schematic
Fig 2-1) or replace
harness (TM
9-4940-568-20).
Verify repair, go to
Step 5 of this Fault.
4.
Is continuity measured
between terminals B and A or
between terminals B and D of
top harness connector?
Replace harness
(TM 9-4940-56820).
Verify repair, go to
Step 5 of this Fault.
WARNING
Read WARNING
on Page 2-27