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TM 5-2420-222-34 3-15. IDLER GEARS REPLACEMENT (Con’t). b. DISASSEMBLY CAUTION Do not remove spring pins unless  damaged. Removal may damage parts. NOTE Step   applies   to   either   upper   or   lower   idler gearshaft.  Lower idler gear-shaft is shown. Drive spring pin (4) our of lower idler gearshaft (3). c. CLEANING AND INSPECTION WARNING Dry  cleaning  solvent,  P-D680,  is  toxic  and  flammable.    Always  wear  protective goggles  and  gloves,  and  use  only  in  a  well-ventilated  area.    Avoid  contact  with skin, eyes and clothes, and DO NOT breathe vapors.  DO NOT use near open flame or  excessive  hear.    The  solvent’s  flash  point  is  100àF  -  138àF  (38C-59C).    If  you become dizzy while using cleaning solvent, immediately get fresh air and medical help.  If solvent contacts eyes, immediately wash your eyes and get medical aid. 1. Clean upper and lower idler spur gears with dry cleaning solvent. 2. Clean oil passage holes with nonelectrical wire and flush with dry cleaning solvent.  Dry with clean rags. 3. Clean all other parts with dry cleaning solvent.  Dry with clean rage. 4. Inspect all metal parts for cracks, bends, or breaks.  Replace all defective parts. 5. Inspect all threaded parts for damaged threads.  Restore damaged threads using screw threading set. 6. Inspect upper and lower idler spur gears for burrs, abnormal wear, and damaged teeth.  Remove burrs with sharpening stone.  Replace if defective. 7. Using micrometer caliper set, measure width of upper and lower idler spur gears at hub.  Width must be 0.8650- 0.8690 in. (21.9710-22.0726 mm). NOTE If upper or lower idler gearshaft needs replacing, spring pin must also be replaced. 8. Using  vernier  caliper,  measure  outside  diameter  of  upper  or  lower  idler  gearshaft  (3  or  14).    Outside  diameter must be 1.7495-1.7515 in.  (44.4373-44.4881 mm). TA701279 3-91

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