TM 9-2320-273-20 Table 3-1. Unit Level Preventive Maintenance Checks And Services M915-M920 Item Interval Item To Be Procedure Not  Mission No. Inspected Capable If: 29 Semi- Frame a.  Inspect  frame  side  rails  for  cracks, a.   Cracks,   bends, Annual and breaks,  bends,  wear  deterioration  and or  breaks  in  frame. Cross- missing  and  loose  fasteners. Any loose or missing fasteners. members b.   Inspect   crossmembers   for   cracks, b.   Cracks,   bends, breaks,  bends,  wear  deterioration  and or breaks in missing  and  loose  fasteners. crossmembers. Any loose or missing fas- teners. 30 Semi- Torque a. Check torque rods for damage. a.   Damage   is   evi- Annual Rods dent. b. Check mounting brackets for cracks, b.   Cracks,   breaks, breaks, rust, and loose mounting hard- or  loose  mounting ware  on  frame. hardware. WARNING Do not start engine or move vehicle when anyone is under vehicle. Severe injury or death  could  result. NOTE 31 Semi- Propeller When using a grease gun, apply lubricant Annual Shafts to   the   fitting   until   clean   lubricant and   Uni- squeezes out of the part being lubricated. versal Joints NOTE Use the proper lubricant to purge all four bearing  seals  of  each  universal  joint. This  flushes  abrasive  contaminates  from each bearing and assures all four bear- ings are filled properly. NOTE When vehicle is operating under severe conditions,  lubricate  propeller  shafts  and universal joints every 500 hours. a. Lubricate using GAA all axle propeller a.   Fitting   will   not shafts  and  universal  joints. purge   old   lubricant out of component. 3-10.14  Change  4