TM 9-2320-360-10
Table 3-1. Troubleshooting (Cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
FIFTH WHEEL WILL NOT UNLOCK WHEN DISCONNECTING TRAILER FROM HET
TRACTOR.
Step 1.
Check if dirt, ice, snow, or other debris has built-up on fifth wheel.
Clean dirt, ice, snow, and other debris from fifth wheel.
NOTE
It may be necessary to set trailer brakes and move HET Tractor
slightly backward to relieve pressure on locking mechanism.
Step 2.
Check if secondary lock release handle is in the unlocked position.
Pull secondary lock release handle out to the unlocked position.
Step 3.
Check if primary lock release handle is in the unlocked position.
Pull primary lock release handle out to the unlocked position.
Step 4.
Check if fifth wheel needs lubrication.
Notify unit maintenance if any hardware is loose or missing.
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