TM 9-2320-280-10 2-76 Change 1 Item No. Interval Crewmember Procedure Not Fully Mission Capable If: Table 2-2.  Preventive Maintenance Checks and Services (Cont’d) Location Item to Check/ Service DRIVER 20 During Power- Be alert for unusual noises or Unusual noise or train vibrations from engine, trans- vibration detected. mission, transfer, differentials, propeller shafts, axle shafts, or wheels. DRIVER 21 During Trans- Check transmission for Transmission slips mission proper operation. or will not shift. DRIVER 22 During Ambulance NOTE Air-condi- Perform the following tioner inspection only if the air (M997, conditioner is required M997A1, for climatic conditions. and Turn air conditioner on and M997A2 set blower to maximum cooling only) speed settings. Wait 5 minutes to allow temperature to stabi- lize. Check outlet ducts for cool air. DRIVER 22.1    After Gear a.  Check transmission shift a.  Lever inoperable Shifter lever operation. Shift trans- or binds between Lever mission through all operating range detents. ranges. Lever should move freely through all range positions. b.  Check transfer shift lever b.  Lever inoperable operation. With transmission or does not engage in “N,” shift transfer lever in all ranges with through all range positions. engine not running. Lever should move freely through all range positions. Climatic conditions require air-condition- ing and A/C is inoperable, and if outlet duct air is not cooler than ambient temperature.