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 443 of 1313
ENGINE OVERHEATS - Continued
STEP
8.
IS AIR AVAILABLE TO RUN THE COOLING FAN?
a.
Start engine.
T1007DAA
SECONDARY
AIR
PRESSURE
GAGE
INSTRUMENT
PANEL
Figure 10.
Air Pressure Gauge.
b.
Monitor secondary air pressure gauge on instrument panel. Refer to point to point schematics.
CONDITION/INDICATION
IS AIR AVAILABLE TO RUN THE COOLING FAN?
DECISION
NO - Perform Secondary Pressure Gauge Reads No Pressure, Low Pressure, Or Builds To Normal Operating
Pressure Slowly. Primary Pressure Gauge Reads Normal troubleshooting (WP
0131).
YES - Go to Step (9).
TM 9-2320-272-23-1
0028
0028-12
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