TM 9-2320-209-10-1 (2) Skidding. When the rear end of the truck skids to either right or left, instantly turn the front wheels in the same direction in which the rear end is skidding. Take your foot off the accelerator pedal but do not step down on the clutch pedal. Pump down on brakes lightly. d. Dusty or Sandy Roads. (1) When operating truck on dusty or sandy terrain, clean air filter daily. (Refer to TM 9-2320-209-10-4.) e. Rocks and Boulders. CAUTION Too much pressure in tires will cause more shock through the moving truck. Not enough pressure in tires can cause internal breaking of the tires or damage to the tube. (1) Refer to table 2-5 and inflate tires properly. (2) Check tire pressure when tires are cold. (3) Do not let out air when tires are hot. f. High Altitudes. (1) High altitude operation requires careful maintenance of the cooling system. As you go to a higher altitude, the boiling point of your coolant will become lower. The pres- surized cooling system of your truck will operate at 220° F when taken care of in the right way. (2) Check all hose connections for leaks daily and be sure that radiator cap is closed properly. 4-25. FORDING OPERATION. a. General. Your truck can ford bodies of water up to a depth of 30 inches without the use of special equipment. Special kits are available for deep water fording. (Refer to para 4-18.) 4-410