TM 5-5420-278-24&P
0010 00
0010 00-3
5.
OUTER PONTON LOCK WILL NOT ENGAGE OR HOLD WHEN ENGAGED (INTERIOR BAY ONLY)
Step 1. Check for bent or damaged outer ponton lock/release lever, receiver plate, or turnbuckle.
If bent or damaged, straighten or replace lock/release lever, receiver plate, or turnbuckle
(WP 0045 00).
Step 2. Check for correct outer ponton lock adjustment.
Perform outer ponton lock adjustment (WP 0045 00).
END OF TESTING
6.
HANDRAIL STANCHION DOES NOT HOLD WHEN SET
Step 1. Check handrail stanchion and support brackets for obstructions or debris lodged at base.
Free and remove debris.
Step 2. Check for broken tension spring and bent stanchion or support brackets.
Straighten or replace bent or broken support brackets, stanchion, or spring (WP 0052 00).
END OF TESTING
7.
LOWER LOCK-DRIVE WILL NOT ENGAGE
Step 1. Check for possible misalignment of ponton connecting eyes.
Align bay connecting eyes (malfunction 12).
Step 2. Check for seized jackscrew at upper and lower trunnion nuts.
Lubricate jackscrew.
Step 3. Check for bent jackscrew or damaged threads.
If threads are damaged or jackscrew is bent, replace (WP 0030 00 or WP 0050 00).
Step 4. Check lower lock-drive assembly for jamming due to debris or damage resulting in misalignment.
Remove debris or replace damaged parts (WP 0030 00 or WP 0050 00).
Step 5. Check for bent or damaged connecting eyes on yokes (ramp bay only).
Replace yoke if bent or damaged (WP 0030 00).
Step 6. Check for bent or damaged connecting eyes on inner ponton main lower coupling
(interior bay only).
If damaged, notify support maintenance for repair, or replace main lower
coupling (WP 0048 00).
END OF TESTING
8.
SWIVEL HOOK WILL NOT ENGAGE OR HOLD WHEN ENGAGED (RAMP BAY ONLY)
Step 1. Check for obstructions such as rocks or debris in swivel hook or retainer pin cavities.
Remove debris from swivel hook or retainer pin.
Step 2. Check retainer pin for proper adjustment.
Adjust retainer pin (WP 0027 00).
Step 3. Check for bent or damaged tension spring assembly.
If bent or damaged, straighten or replace tension spring assembly (WP 0026 00
or WP 0027 00).
END OF TESTING
Unit Mechanical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
