TM-9-2320-280-34

TRUCK, UTILITY: M998 SERIES

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

JANUARY 1996
TM-9-2320-280-34

  TM-9-2320-280-34 - Page 44 of 1258

TM 9-2320-280-34
2 - 1 8
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
NOT E
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
NOT E
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


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