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 1153 of 1313
COOLING FAN DOES NOT STOP RUNNING, ENGINE TEMPERATURE BELOW NORMAL OPERATING
RANGE (OVERRIDE BOLT NOT INSTALLED) - Continued
STEP
1.
IS THE FAN DRIVE CLUTCH ACTUATOR FAULTY?
a.
Allow engine to cool. Refer to point to point schematics.
COOLING
FAN
ENGINE
FAN DRIVE
CLUTCH
ACTUATOR
T0334DAA
Figure 1.
Fan Clutch Actuator.
b.
Replace fan drive clutch actuator M939/A1 (Volume 3, WP
0447), M939A2 (Volume 3, WP
0448).
c.
Start engine and bring to normal operating temperature.
d.
If cooling fan operates only when needed, fan drive clutch actuator was faulty.
CONDITION/INDICATION
IS THE FAN DRIVE CLUTCH ACTUATOR FAULTY?
DECISION
YES - Go to Step (2) to verify problem is solved.
NO - Notify supervisor. It is possible another troubleshooting work package applies.
TM 9-2320-272-23-1
0139
0139-2
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