TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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Table 2-1. Unit Level Preventive Maintenance Checks and Services HMMWV ITEM NO. INTERVAL ITEM TO BE INSPECTED PROCEDURES PRIOR TO ROAD TEST Ensure Operator/Crew has performed PMCS listed in TM 9- 2320-280-10. ROAD TEST Maintenance personnel will be with vehicle operator to assist in perform- ing PMCS checks and verify pre- service checks. 1 Semi- Pre-Service a. Notice if starter engages smoothly a. Starter inoperative or Annual Checks and turns the engine at normal makes excessive grinding cranking speed. sound. b. Listen for unusual noise at idle, b. Engine knocks, rattles, at operating speed, and under or smokes excessively. acceleration. Be alert for excessive vibration and the smell of oil, fuel, and exhaust. c. Check for transmission response to c. Transmission shifts shifting and for smoothness of improperly, does not shift, operation in all gear ranges. Be alert or makes excessive noises. for unusual noises and difficulty in shifting in any speed range. d. Check for transfer response to d. Lever inoperable or shifting and for smoothness of does not engage in all operation in all gear ranges. Be ranges with engine not alert for unusual noises and difficulty running. in shifting in any gear range. e. Test for response to accelerator e. Pedal sticking or feed. Observe for sticking pedal. binding. f. With vehicle speed approximately 5 f. Steering binds, grabs, mph (8 kph) turn steering wheel to wanders, or has excessive left, then right, to detect hard steering, freeplay. steering backlash, or shimmy. Vehicle should respond instantly. With vehicle moving on straight, level terrain, lightly hold steering wheel to check for pull and wandering. g. Apply brake pedal with steady force. g. Brakes chatter, pull Vehicle should slow and stop without to one side, or inoperative. pulling to one side or jerking. Release Brakes will not release. brake pedal. The brakes should release immediately and without difficulty. NOTE If desired range cannot be selected, turn engine off, select range, and re- start engine. TM 9-2320-280-20-1 Change 1 2-5 NOT FULLY MISSION CAPABLE IF: