TM 9-2320-361-10 2-39. OPERATION IN RAINY OR HUMID CONDITIONS (Contd) Do not operate vehicle on wet, smooth roads with lowered tire inflation. Do not operate vehicle at too great a speed for road conditions. Low tire inflation or excessive speeds may cause loss of vehicle control on wet, smooth roads, resulting in injury or death to personnel. b. Before Operation. If vehicle is to be operated cross-country in heavy rain, deflate tire pressure to 15 psi (103 kPa). Refer to para. 3- 14f. c. Driving Vehicle. Perform steps in para. 2-36b. d. After Operation. (1) Perform after operation PMCS. Refer to table 2-2. (2) Notify maintenance personnel to drain water from fuel tank. Fill fuel tank. (3) Reinflate tires to proper operating pressure. Refer to para. 3-14f. 2-40. OPERATION IN DEEP MUD a. General. CAUTION Do not attempt operation when only one driving wheel is equipped with tire chains. Doing this may result in damage to tires and powertrain. (1) Prolonged operation in deep mud requires the use of tire chains on driving wheels. Refer to FM 21-305 for installation of tire chains. (2) If tire chains are not available, deflate tire pressure to 15 psi (103 kPa). Refer to para. 3-14f. b. Before Operation. Perform before operation PMCS, table 2-2. c. Driving Vehicle Cross-Country. (1) Start engine. Refer to para. 2-14 or 2-15. (2) Engage front wheel drive. Refer to para. 2-4. NOTE When placing the vehicle in motion in deep mud, make sure front wheels are in straight ahead position. (3) Place vehicle in motion (refer to para. 2-16) with transmission gearshift lever in “2” (second) position and transfer case shift lever in LOW position. Begin movement by releasing clutch pedal gradually, without causing wheels to spin or engine to race. (4) If rear end skidding occurs, turn steering wheel in direction of skid. Let up on accelerator pedal but do not depress clutch pedal. Pump brake pedal gradually to recover from skid. (5) Be prepared to downshift transmission gearshift lever, if necessary, to prevent vehicle from getting stuck in mud. 2-189 WARNING