TM 5-5420-278-100058 000058 00-4MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONOperator’s Mechanical Troubleshooting (Contd)7. LOWER LOCK-DRIVE WILL NOT ENGAGEStep 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, notify unit maintenance.Step 4. Check lower lock-drive assembly for jamming due to debris or damage resulting in misalignment.a. Remove debris from lower lock-drive assembly.b. If damage causing misalignment is suspected, notify unit maintenance.Step 5. Check for bent or damaged connecting eyes on inner ponton mainlower coupling (interior bay only).If damaged, notify unit maintenance.Step 6. Check for bent or damaged connecting eyes on yokes (Ramp Bayonly).If damaged, notify unit maintenance.END OF TESTING8. 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 orretainer pin cavities.Remove debris from swivel hook or retainer pin.Step 2. Check retainer pin for out of adjustment condition. Notify unit maintenance to check adjustment.Step 3. Check for bent or damaged tension spring assembly.If bent or damaged, notify unit maintenance.END OF TESTING
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