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 1159 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
3.
DOES AIR SYSTEM LEAK WITH SHIFT LEVER IN LOW POSITION?
a.
Place transfer case shift lever into low position. Refer to point to point schematics.
INSTRUMENT
PANEL
SECONDARY
AIR
PRESSURE
GAGE
SPRING BRAKE
ASSEMBLY
TRANSFER
CASE SHIFT
LEVER
T0342DAA
Figure 3.
Transfer Case Shift Lever.
b.
Observe secondary air pressure gauge.
c.
If pressure gauge indicates a steady loss of pressure, system is leaking.
CONDITION/INDICATION
DOES AIR SYSTEM LEAK WITH SHIFT LEVER IN LOW POSITION?
DECISION
YES - Go to Step (4).
NO - Go to Step (8).
TM 9-2320-272-23-1
0140
0140-4
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