TM-9-2320-387-10 HMMWV Operator Manual Download
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NOTE Before you operate your vehicle, be sure to perform the Preventive Maintenance Checks and Services (PMCS) shown in table 2-2. a. Perform all break-in service before operation checks and services as indicated in table 2-2. b. Upon receipt of vehicle, or after engine replacement, the following break-in speeds and precautions should be observed during the first 500 mi (805 km) of operation: • Do not exceed a speed of 55 mph (89 kph). • Do not drive for long periods of time at constant speed. • Avoid rapid acceleration or deceleration. • Drive at a moderate speed until the engine is fully warmed up. • Do not tow trailer. TM 9-2320-387-10 2-62 Change 1 .WARNING. • The automatic transmission has a PARK position. Never use the shift lever in place of the parking brake. Set the parking brake. Make sure the transmission shift lever is in the P (park) position and transfer case shift lever is NOT in the N (neutral) position. Damage to equipment and injury to personnel may occur if these instructions are not followed. • Chock blocks will be used when parking a vehicle with inoperative parking brakes, operating in extreme cold conditions, parking on inclines, or whenever and wherever maintenance is being performed. Failure to do so may result in injury to personnel or damage to equipment. • Hearing protection is required for driver and passengers when engine is running. Noise levels produced by these vehicles exceed 85 dBA, which may cause injury to personnel. a. Ensure transmission shift lever (3) is in the P (park) position and transfer case shift lever (4) is NOT in the N (neutral) position. NOTE To apply parking brake, grasp handle firmly and pull upward until handle is locked in a straight-up position. a.1. Ensure parking brake (5) is applied. b. Adjust driver’s seat (para. 2-16). 2-11. BREAK-IN SERVICE 2-12. STARTING THE ENGINE