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 502 of 1313
HARD SHIFTING OF TRANSFER CASE - Continued
STEP
4.
DOES CIRCUIT 585 WIRE SUPPLY CONTROL SWITCH WITH BATTERY VOLTAGE?
a.
Check for battery voltage at circuit 585 wire. Refer to point to point schematics.
b.
Place battery to OFF position.
c.
Reconnect circuit 586 wire.
d.
Disconnect circuit 585 wire from transfer case control switch.
T0117DAA
585
585
586
586
Figure 4.
Circuit 585 Wire.
e.
Place battery switch to ON position.
f.
Connect red multimeter lead to disconnected circuit 585 wire as shown.
g.
Connect black multimeter lead to vehicle chassis ground.
h.
Meter reading should be greater than 18 VDC.
CONDITION/INDICATION
DOES CIRCUIT 585 WIRE SUPPLY CONTROL SWITCH WITH BATTERY VOLTAGE?
DECISION
YES - Replace transfer case control switch (Volume 3, WP
0396). Go to Step (7) to verify problem is solved.
NO - Go to Step (5).
TM 9-2320-272-23-1
0040
0040-5
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