TM 9-2320-279-10-1 3-40.2 Change 7 Operators Maintenance (Cont) 3-6.   CHANGE WHEEL AND TIRE ASSEMBLY (CONT). WARNING S If spare tire is underinflated, overinflated or if wheel or tire has obvious damage, or is suspected of damage, the tire must be completely deflated by removing the valve core from the valve stem. Any attempt to inflate an underinflated, overinflated, or damaged spare tire could result in serious injury or death. S Tire air pressure must be checked properly or serious injury or death may result. S Stand clear of trajectory area during deflation or personal injury or death could result. NOTE Tire valve stem can be rotated in wheel so it points away from vehicle. Cap must be removed to rotate valve stem. (3.1) Check spare tire air pressure and compare reading to Table 3-2.1. If tire is underinflated, overinflated or there is obvious or suspected damage to wheel or tire, completely deflate tire (para 3-9). Table 3-2.1. Unsafe Inflation Pressures Spare Tire is: Spare Tire is: Overinflated: Tire pressure measured is 25% or more above the standard tire pressure. Underinflated: Tire pres- sure measured is 80% or less than the standard tire pressure. Do not adjust pressure if above pressure shown below. Do not adjust pressure if below pressure shown below. Highway Standard Tire Sand Tire 125 psi (862 kPa) 125 psi (862 kPa) 80 psi (552 kPa) 80 psi (552 kPa) Cross Country-Dry Standard Tire Sand Tire 125 psi (862 kPa) NA 80 psi (552 kPa) NA Cross Country-Wet Standard Tire Sand Tire 125 psi (862 kPa) NA 80 psi (552 kPa) NA Sand Standard Tire Sand Tire 125 psi (862 kPa) 125 psi (862 kPa) 80 psi (552 kPa) 80 psi (552 kPa)