TM 10-4320-315-24 Table 2-1.  Unit Preventive Maintenance Checks and Services Procedures Interval Item Procedures Equipment is Item to be Check for and have repaired Not Read/ No. M S A H Inspected or adjusted as necessary Available If: 1 • Batteries Check specific gravity (TM 9-6140-200-14). Specific gravity Replace or recharge as required. of cells is less than 1.260. 2 • Engine Check for cracks or leaks.  Tighten loose Loose mounting hardware.  If engine is damaged or hardware. leaking, notify supervisor. Leaks and/or cracks are found. 3 • Engine Check every 125 hours for accumulation of Cooling dust on inside of cooling air blower and System cylinder cooling fins.  Remove and clean any accumulation. 4 • Engine Oil Change oil every 250 hours (LO 10-4320- 315-12).  Change oil at 50 hours for new or overhauled engines. 5 • V-Belts Inspect for wear and tension every 250 Worn V-belts. hours.  Replace and adjust if necessary Deflection (para.  2-41). exceeds 1/2 in. (12.7 mm). 6 • Engine Check valve clearance every 500 hours. Valve Adjust if required (para.  2-55). Clearance 7 • Fuel Filters Change fuel filters every 1000 hours (para. 2-43). 8 • Fuel Supply Check and clean strainer every 1000 hours Pump (para.  2-51). Strainer 9 • Brake Lines Check brake lines for leaks.  Replace leaky Class III leak. lines (para.  2-57). 10 • Brake Shoes Check brake shoes for wear.  Replace if Worn brake worn to rivets (para.  2-59). shoes. 11 • Pump and Check for cracks and leaks.  Check for loose Hardware Elbow or missing mounting hardware.  Tighten missing and/or loose mounting hardware.  Replace missing leaks occur mounting hardware. 12 • Exhaust Inspect muffler and pipes for damage and Damaged or Pipes and leaks. leaky muffler Muffler and pipes. 13 • Wheel Clean, inspect, and repack wheel bearings Annually or Bearing (para.  2-58). 3000 hours whichever comes first 2-5