TM 9-2320-209-10-1 e. Parking the Truck. (1) Do not park truck in the sun for long periods; heat and sunlight will shorten the life of tires. When possible, park under cover to keep truck from sun, sand, and dust. (2) Cover trucks not being used with paulins if no other suitable shelter is available. When entire truck cannot be covered, cover window glass to stop etching of glass by sand, and cover engine compartment to keep out sand. (3) Check that tires are properly inflated. (Refer to table 2-5.) NOTE When checking tire pressure, do not let out air if tire is hot. 4-24. OPERATION ON UNUSUAL TERRAIN. a. Deep Snow or Mud. (1) Choose a FRONT TRANSMISSION position low enough to keep engine speed above recommended minimum speed (rpm) without making the wheels spin. (2) Take care to keep spinning wheels from becoming buried up to the axle housing. CAUTION Do not lower tire pressure enough to damage equipment. Refill tires to recommended pressure after emergency. (3) If necessary, lower tire pressure. (Refer to table 2-5.) CAUTION Do not drive with chains on only one wheel of a driving axle. This may result in damage to the tire and/or power train. (4) Tire chains should be used at all times when driving in deep snow, mud, or soft sand. WARNING Do not jam sticks or stones under a spinning wheel. This can cause injury to personnel or unnecessary tire wear. (5) If one or more tires become stuck, use another truck to tow or winch the stuck truck. If a truck is not available jack up stuck truck and put planking or matting under the wheel. (6) After operating truck on muddy or snowy surfaces, clean ice, snow or mud from wheels, axles, radiator core, engine compartment steering knuckles and arms, air cleaner intake, and electrical connections. b. crust. c. Hard Baked Sand. When driving on hard baked sand, try not to break through the A roadbed of canvas or planking should be set down for short distances. Ice. (1) General. Skidding and loss of steering control are the main troubles found when driving on icy roads. Due to lack of traction, the truck may continue in a straight direction no matter which way you turn the wheels. When the wheels reach a point where you get traction back the truck may veer sharply to left or right or stall. 4-409