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 1080 of 1313
NO AIR PRESSURE (WARNING BUZZER SOUNDING, AIR PRESSURE NOT BUILDING TO NORMAL
OPERATING RANGE AS INDICATED BY GAUGES) - Continued
T0253DAA
Secondary Air Pressure Gage
Primary Air Pressure Gage
Figure 6.
Air Pressure Gauges.
g.
Compare pressure gauge reading with reading on instrument panel air pressure gauges.
h.
If instrument panel air pressure gauge reading is different than pressure gauge reading, instrument panel
air pressure gauge is not working properly.
CONDITION/INDICATION
ARE AIR GAUGES WORKING PROPERLY?
DECISION
NO - Primary air system pressure gauge not reading properly. Perform Primary Pressure Gauge Reads No
Pressure, Low Pressure, or Builds To Normal Pressure Slowly troubleshooting (WP
0130).
NO - Secondary air system pressure gauge not reading properly. Perform Secondary Pressure Gauge Reads
No Pressure, Low Pressure, or Builds To Normal Pressure Slowly troubleshooting (WP
0131).
YES - Go to Step (5).
TM 9-2320-272-23-1
0126
0126-9
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