TM 9-2320-302-20 0021 00-6 Table 1. Unit Preventive Maintenance Checks and Services (PMCS) for the M915A3 Tractor Truck - Continued. ITEM NO. INTERVAL LOCATION PROCEDURE NOT FULLY MISSION CAPABLE IF: ITEM TO CHECK/ SERVICE 11 (Con’t) Semi- annual Engine Compartment, Drive Belts and Pulleys d.  Check  for  cracked  pulleys  or  pulleys  out of alignment. WARNING If NBC exposure is suspected, all air filter media should be handled by per- sonnel  wearing  protective  equipment.  Consult  your  NBC  Officer  or  NBC NCO for appropriate handling or disposal procedures. 12 Semi- annual Engine Compartment, Air Intake System a.   Check  air  cleaner,  hoses,  and  air  cleaner seal for proper installation, cracks, breaks or  loose  connections  that  could  let  unfil- tered air into air intake system. b.  Check  air  cooler  intake  screen  for  debris and damage. c.   Check  air  intake  filter  element  for  clog- ging and wear. NOTE Refer to TM 750-651 for cooling system service information. 13 Semi- annual Engine Compartment, Cooling System a.   Remove    debris    from    cooling    fins    and check for bent fins. b.  Inspect  radiator  and  charge  air  cooler  for leaks. c.   Check radiator hoses for cracks, bulges or soft   spots.   Ensure   that   hose   clamps   are tight. d.  Check   radiator   cap,   gaskets,   and   rubber isolator  mounts  and  fan  shroud  for  cracks and leaks. e.   Inspect water pump for leaks. 14 Semi- annual Engine Compartment, Power Steering Components a.   Inspect power steering pump and reservoir (6) for leaks, cracks, loose hoses, or other damage. b.  Remove  plug  (7)  from  reservoir  (6)  and drain fluid into a suitable container.