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 444 of 1313
ENGINE OVERHEATS - Continued
STEP
9.
DOES FAN DRIVE CLUTCH ACTUATOR OPERATE?
a.
Shut off engine.
b.
Allow engine to cool.
c.
Remove fan drive clutch actuator and temporarily replace with a known good actuator
M939/A1 (Volume 3, WP
0447), M939A2 (Volume 3, WP
0448). Refer to point to point schematics.
T1008DAA
COOLING FAN
ENGINE
FAN DRIVE CLUTCH
ACTUATOR
Figure 11.
Fan Clutch Actuator.
d.
Start engine and bring to normal operating temperature.
NOTE
If fan operates properly, fan clutch was faulty.
e.
Check if fan operates properly.
CONDITION/INDICATION
DOES FAN DRIVE CLUTCH ACTUATOR OPERATE?
DECISION
NO - Replace fan drive clutch actuator M939/A1 (Volume 3, WP
0447), M939A2 (Volume 3, WP
0448). Go to
Step (12) to verify problem is solved.
YES - Go to Step (10).
TM 9-2320-272-23-1
0028
0028-13
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