TM 9-2320-303-10 Table 2-1.  Preventive Maintenance Checks and Services (PMCS) for M915A4 (Con't). Location Item To Check/ Not Fully Mission Item No. Interval Service Procedure Capable If: CAB INTERI- OR 58 Weekly Doors and Windows Check operation and general   condition   of   cab doors and windows. OVER- ALL VEHICLE 59 Monthly Under- carriage, Frame, Cab,  and Propeller Shafts a.   Check for obvious damage  to  frame  and undercarriage. a.   Any loose or broken frame side  rails,  crossmembers, broken   welds,   or   broken bolts are found. b.   Check  propeller  shafts and   U-joints   for   loose or    broken    bolts    and nuts. b.   Mounting   bolts   and   nuts are loose or missing. 60 Monthly Air System Check all air lines, fittings, and  valves  for  looseness or damaged. Any    air    lines,    fittings,    or valves are loose or damaged. 61 Monthly Exhaust System Check exhaust system for corrosion,    looseness,    or damage. Pipe,     clamp     or     hardware damaged or missing. 62 Monthly Spare Wheel and    Tire and Vehicle Tires a.   Check spare wheel and tire for cuts, gouges, cracks, or uneven wear. a.   Spare  wheel  and  tire  are missing or damaged. b.   Check for secure mounting of spare wheel and tire. c.  Check  all  vehicle  tires for cuts, gouges, cracks, or uneven wear. c.  Any    tire    is    missing    or damaged. 2-58