TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 428 of 1313
ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE - Continued
DECISION
YES - Replace thermostat M939/A1 (Volume 2, WP
0288), M939A2 (Volume 2, WP
0289). Go to Step (4) to
verify problem is solved.
NO - Go to Step (2).
STEP
2.
DOES FAN DRIVE CLUTCH WORK PROPERLY?
a.
Inspect fan drive clutch for proper operation.
T0071DAA
Figure 2.
Fan Clutch.
b.
Make sure override lockup bolts are removed from clutch housing and stored in clutch housing bracket
(M939/A1 only) (TM 9-2320-272-10).
CONDITION/INDICATION
DOES FAN DRIVE CLUTCH WORK PROPERLY?
DECISION
YES - Go to Step (3).
NO - Fan drive clutch actuator defective. Replace fan drive clutch actuator M939/A1 (Volume 3, WP
0447),
M939A2 (Volume 3, WP
0448). Go to Step (4) to verify problem is solved.
NO - Fan drive clutch defective.
Replace fan drive clutch (Volume 2, WP
0295). Go to Step (4) to verify problem
is solved.
TM 9-2320-272-23-1
0027
0027-3
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