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 1160 of 1313
FRONT WHEEL DRIVE DOES NOT ENGAGE (FRONT WHEEL DRIVE LOCK-IN SWITCH ENGAGED AND
TRANSFER CASE SHIFT LEVER IN HIGH POSITION) - Continued
STEP
4.
IS THERE A LEAK FROM THE AIR LINE BETWEEN THE ACTUATOR VALVE AND THE TRANSFER CASE?
Inspect the air line between the actuator valve and the transfer case for an air leak. Refer to point to point
schematics.
T0343DAA
ACTUATOR
VALVE
DELIVERY
LINE
(TO TRANSFER
CASE)
Figure 4.
Air Line Between Actuator Valve and Transfer Case.
CONDITION/INDICATION
IS THERE A LEAK FROM THE AIR LINE BETWEEN THE ACTUATOR VALVE AND THE TRANSFER CASE?
DECISION
YES - Replace damaged air lines (Volume 5, WP
0805). Go to Step (10) to verify problem is solved.
NO - Go to Step (5).
TM 9-2320-272-23-1
0140
0140-5
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