TM 5-5420-280-10
0035 00
Bridge Mechanical Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Refer to the general instructions in Introduction to
Troubleshooting, WP 0034 00, prior to performing
mechanical troubleshooting.
1. UPPER COUPLING WILL NOT LOCK
Step 1. Check side-to-side level of pallet.
If pallet is level, raise pallet 0.5 to 1 degree higher and repeat coupling
steps. Refer to WP 0016 00.
Step 2. Check position of forward pinwheel drive gear and upper bridge half
launch beam channel pins. If pins are not resting near bottom of drive
gear tooth, operate forward pinwheel through RCU working step L-14.
Refer to WP 0016 00.
Step 3. Check both upper coupling lock remote control levers (red levers) for
engagement in receptacle brackets.
If one or both levers are not engaged, use BII tanker bar to manually
release upper coupling lock mechanisms. Refer to WP 0008 00.
Step 4. Check for obstruction or jamming caused by rocks or debris.
Remove obstruction or clean debris from upper coupling. Refer to
Step 5. Check for broken or missing spring.
If spring is missing or broken, notify field maintenance.
Step 6. Check lock mechanism for proper engagement.
If lock mechanism will not engage, notify field maintenance.
Step 7. Check plunger on upper coupling lock mechanism for obstruction,
debris, if bent, or roller is missing.
Remove obstruction or clean debris and engage mechanism using BII
tanker bar. Refer to WP 0016 00. If lock mechanism will not engage,
notify field maintenance.
END OF TESTING
2. UPPER COUPLING WILL NOT UNLOCK
Step 1. Bridge not raised to pre-stressed position.
Release ACTION 2 button immediately before upper coupling remote
control arms reach release levers on pallet. Go back to launch sequence
L16 and deploy bridge across gap until lower couplings are
approximately 2 ft (5.1 cm) past yellow mark. Go back to retrieval
sequence R7 and retrieve bridge again.
Step 2. Check lock mechanism for proper alignment.
If lock mechanism will not engage, notify field maintenance.
END OF TESTING
3. LOWER COUPLING WILL NOT ENGAGE RECEPTACLE
Step 1. Check for possible side-to-side misalignment of bridge halves or lower
Align bridge halves using tanker bar. Refer to WP 0016 00.
Step 2. Check for obstruction or jamming caused by rocks or debris.
