Table 2-1.  Unit Level Preventive Maintenance Checks and Services HMMWV (Cont’d). ITEM NO. INTERVAL ITEM TO BE INSPECTED PROCEDURES 21 Semi- Batteries annually (Cont’d) a.  Inspect battery box for corrosion and   a.  Corrosion has made debris. holes in metal battery box. b.  Clean slave receptacle and coat b.  Terminals corroded. with corrosion-resistant compound (appendix C, item 61). c.  Check and record specific gravity c.  Cell is below 1.225 of each cell. specific gravity. d.  Inspect battery cables for frays, d.  Cables frayed, split, splits, or looseness. or loose. SPECIAL PURPOSE BODIES 21.1 Semi- Doors Inspect door latches/strikes for proper Doors do not seal against annually adjustment (para. 11-9). body. 22 Semi- Cargo Shell Check adjustment of cargo shell door annually Door (para. 11-15). 23 Semi- Rear Cargo Check rear cargo door for proper annually Door operation. Rotate gas springs (para. 11-23) 180° every six months and move left spring to right side and right spring to left side. 23.1 Semi- Weapon a.  Ensure brushes are present and are a.  Brushes are missing annually Station not curled upward. or curled upward more Turret than 1/4 inch (6.34 mm). b.  Inspect turret brake for cracked b.  Turret brake is mounting bracket welds and for correct misaligned or mounting adjustment (para. 11-55). bracket welds cracked. c.  Inspect for damage or bending of stop    c.  Stop rings notches will ring notches at 0 degrees, 90 degrees, not stop at required 180 degrees, and 270 degrees position. stop positions. TM 9-2320-387-24-1 Change 1 2-23 NOT FULLY MISSION CAPABLE IF: NOTE Refer  to  TM  9-6140-200-14  for  more specific details on battery maintenance. NOTE Add  4  points  (.004)  to  specific  gravity reading for every 10° above 80°F.