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Page Title:
HOOK ARM DOES NOT UNLOAD. (Cont) |
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 TM 9-2320-364-34-1
4. HOOK ARM DOES NOT UNLOAD (CONT).
2.
KNOWN INFO
TEST OPTIONS
Unit Troubleshooting tasks
Operation test.
Does hook arm unload with
completed.
hook arm safe lowering
Hook arm loads.
REASON FOR QUESTION
button pushed in?
DC valve OK.
If load control valve on port VB
POSSIBLE PROBLEMS
side of LH or RH hook arm
manifold is faulty, fluid cannot
Load control valve faulty.
enter cylinder while unloading. If
LH hook arm cylinder faulty.
load control valve on port VA
RH hook arm cylinder faulty.
side of LH or RH hook arm
manifold is faulty, fluid cannot
exit cylinder while unloading.
Pushing in safe lowering button
bypasses the four load control
valves.
Go to Step 6 of this
NO
Fault.
YES
2-288
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