TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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TM 9-2320-280-34 2-18 Change 1 Table 2-1. Mechanical Troubleshooting (Cont'd) 44. VEHICLE MOVES IN NEUTRAL Step 1. Check manual valve for damage and proper installation. Replace manual valve (chapter 17) if damaged. Step 2. Check oil pump for leaking oil passages and damage. Repair oil pump (para. 17-29) if damaged. Step 3. Check forward clutch for damage and burned clutch plates. Repair forward clutch (para. 17-22) if damaged. END OF TESTING! 45. VEHICLE MOVES IN PARK Check parking lock pawl and actuator assembly for damage and proper installation. Replace (para 17-14) if damaged. END OF TESTING! 46. TRANSMISSION NOISY NOTE Check engine accessory drive components: water pump, power steering pump, alternator, and air conditioner compressor (if installed) for the source of “noise” before checking transmission. a. Noise in Neutral and All Driving Ranges. Step 1. Check torque converter for loose mounting capscrews and damage. Tighten capscrews or replace torque converter (para. 17-15) if damaged. Step 2. Check flywheel for damage. Replace flywheel (TM 9-2815-237-34) if damaged. Step 3. Check oil pump for obstructed oil passages, damage, and proper assembly. Repair oil pump (para. 17-29) if damaged. b. Noise in First, Second, Third, and Reverse. Step 1. Check gear unit thrust bearings and races for damage. Replace bearing(s) and races if either is damaged (para. 17-19). Step 2. Inspect gears for damage and wear. Replace damaged or worn components (para. 17-19). Step 3. Inspect front internal gear ring for damage. Replace gear ring if damaged (para. 17-19). c. Noise during Acceleration – Any Gear. Check engine and transmission mounts for looseness or damage. Secure or replace mounts (para. 3-3 or TM 9-2320-280-20). END OF TESTING! TRANSFER CASE 47. TRANSFER CASE WILL NOT SHIFT NOTE Perform the oil pressure diagnostic test (para. 17-32) and record the readings for use during troubleshooting. Step 1. Check transfer case shift linkage for improper adjustment or damage which would interfere with operation. Adjust or replace shift rod (TM 9-2320-280-20). Step 2. Check transfer case fluid level. Add fluid (TM 9-2320-280-20), if necessary. Step 3. Repair or replace transfer case (para. 8-3). END OF TESTING! 48. TRANSFER CASE NOISY Step 1. Check transfer case fluid level. Add fluid (TM 9-2320-280-20), if necessary. Step 2. Repair or replace transfer case (para. 8-3). END OF TESTING! MALFUNCTION TEST OR INSPECTION