TM 10-4320-315-10 Table 2-5.  Operator Preventive Maintenance Checks and Services - (Cont) Interval Procedures: Equipment Is Item Item to be Check for and have repaired Not Ready/ No. B D A W M Inspected or adjusted as necessary Available If: 26 • Exhaust Check mounting brackets and fasteners Pipes and for tightness  Check discoloration for Muffler possible exhaust leaks. 27 • • • Fuel Filters Rotate knob on bottom of primary filter Water present to drain any accumulation of water into in fuel. container When water is drained and clear fuel comes out at drain hose, close valve.  Repeat for secondary filter. 28 • • Fan Belt Check for worn, cracked, or frayed fan Fan belt is belt.  Notify unit maintenance if belt is worn, cracked, loose or needs to be replaced. or frayed. 29 • Air Filter Check air filter gage  Push reset if Air filter gage is Gage indicator is at 20.  If indicator still at 20, 20 indicating check air cleaner (para 3-6). engine air filter restriction 30 • Air Intake Check clamps and rubber boots for Line tightness 31 • Engine Remove air cowling and check for Fins are dirty or Cooling Fins damaged fins.  Check for dirt damaged.  Air accumulation on fins and air passages. passages are Clean as necessary  If fin is damaged, clogged. notify unit maintenance 2-14