TM-9-2320-280-10 HMMWV Operator Manual Download
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TM 9-2320-280-10 2-140 Change 1 (2) After engine starts, pull out hand throttle until desired engine speed is obtained. Twist handle to lock hand throttle. (3) Allow engine to warm up at an increased speed for approximately three minutes. (4) After warm-up period, unlock hand throttle and push hand throttle in and allow engine speed to decrease. 2-31. OPERATING IN EXTREME COLD, ON ICE, OR SNOW a. Before Operation. (1) Operate arctic winterization equipment (para. 2-39 or 2-40). (2) Scrape off any ice accumulated on vehicle. (3) Remove ice and snow from area around air cleaner intake cap. (4) Refer to para. 2-30 for cold weather starting instructions. (5) Refer to para. 2-29 for techniques that can be used when operating on unusual terrain. (6) Refer to para. 3-22 for tire chain installation and operation. (7) Operate troop/cargo winterization heater, if applicable (para. 2-41). b. During Operation. WARNING • Vehicle operation in snow is a hazardous condition. Operator must travel at reduced speeds and be prepared to meet sudden changes in road conditions. Failure to maintain safe stopping distances will cause damage to vehicle and injury or death to personnel. • Pump brakes gradually when stopping vehicle on ice or snow. Sudden braking will cause wheels to lock and vehicle to slide out of control, causing damage to vehicle and injury or death to personnel. • Chock blocks shall be used when parking a vehicle in extreme cold conditions. Failure to do so may result in injury to personnel or damage to equipment. NOTE Keep area around air cleaner intake cap clear of snow and ice. Snow and ice may melt, refreeze, and cause restriction in air intake system. If necessary, remove intake cap and clear ice and snow without damaging intake cap screen. Hold the cap near the vehicle exhaust to quickly melt ice without damaging screen. (1) Place transmission shift lever in “D” (drive) (or “ o D ” overdrive for M1123 and A2 vehicles), and transfer case shift lever in “H/L” (high lock range). Place vehicle in motion slowly to prevent wheels from spinning. NOTE If additional power is needed to extract vehicle when mired in snow, place transmission in “1” (first) and transfer case in “L” (low range). After vehicle is extracted from mired condition, immediately return transfer case to “H/L” (high lock range) position. (2) If rear skidding occurs: (a) Let up on accelerator pedal. (b) Turn steering wheel in direction of skid until control has been regained. (c) Apply brake pedal in a gradual pumping manner. c. After Operation. (1) Remove all ice and snow from underside of vehicle and fuel tank filler cap. (2) Drain fuel filter (para. 3-10).