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 504 of 1313
HARD SHIFTING OF TRANSFER CASE - Continued
STEP
6.
IS THERE BATTERY VOLTAGE AT TRANSFER CASE CONTROL CIRCUIT BREAKER?
a.
Place battery to OFF position.
b.
Reconnect circuit 37 wire.
c.
Disconnect circuit 10 wire from circuit breaker. Refer to point to point schematics.
T0115DAA
Figure 6.
Circuit 10 Breaker.
d.
Place battery switch to ON position.
e.
Connect red multimeter lead to circuit 10 wire as shown.
f.
Connect black multimeter lead to vehicle chassis ground.
g.
Meter reading should be greater than 18 VDC.
CONDITION/INDICATION
IS THERE BATTERY VOLTAGE AT TRANSFER CASE CONTROL CIRCUIT BREAKER?
DECISION
YES - Replace circuit breaker (Volume 2, WP
0307). Go to Step (7) to verify problem is solved.
NO - Repair circuit 10 wire (Volume 3, WP
0352). Go to Step (7) to verify problem is solved.
TM 9-2320-272-23-1
0040
0040-7
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