TM 9-2320-279-10-1 Change 6 2-56.3 Table 2-1. Preventive Maintenance Checks and Services for Models M977 thru M985E1 With Three Piece Split Rim Location Item No. Interval Item to Check/ Service Crewmember Procedure Not Fully Mission Capable If: DRIVER 40 After Spare Tire/Wheel a.  Check    tire    for    cuts, gouges, cracks, or scratches. Remove any sharp objects. a.  Tire has cuts, gouges or cracks which would result in tire failure during op- eration. Tire missing or unserviceable. b.  Inspect wheels complete- ly for any cracked, broken, or bent surfaces. Check for dis- colorations or warping that may indicate excessive heat or impact damage. Check the rim, side rings, and lock rings for any cracked, broken or bent    ends    or    surfaces, cracked paint or impact dam- age. Check the lug nut area for  evidence  of  elongated mounting holes that may indi- cate a wheel is loose. Check wheel components for pitting from corrosion, discoloration, deformation, or warping that may indicate excessive heat. Check that the lock ring ends do not touch and that the lock ring fits securely in the wheel groove against the side ring and has a uniform seated ap- pearance around the entire wheel circumference. Check all visible surfaces that con- tact the lock ring for damage that may indicate loose or damaged parts. Check lock ring for a raised notch and en- sure it faces away from the wheel. b.  Wheel, side ring, or lock ring is cracked, broken, bent, discolored by heat, warped, misa- ligned, loose, im- properly mounted, or damaged by impact or wear. The wheel has two or more elongated or dam- aged holes on the same wheel. The lock ring ends touch, or the raised notch is missing or facing the wheel.