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 1161 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
5.
IS THERE AN AIR LEAK FROM THE SUPPLY LINE AT THE ACTUATOR VALVE?
Inspect the supply line attached to the actuator valve for an air leak. Refer to point to point schematics.
T0345DAA
ACTUATOR
VALVE
SUPPLY
LINE
Figure 5.
Air Supply Line to Actuator Valve.
CONDITION/INDICATION
IS THERE AN AIR LEAK FROM THE SUPPLY LINE AT THE ACTUATOR VALVE?
DECISION
YES - Replace damaged air lines (Volume 5, WP
0805). Go to Step (10) to verify problem is solved.
NO - Notify supervisor. Action may not be possible at this level of maintenance.
TM 9-2320-272-23-1
0140
0140-6
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