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 1095 of 1313
AIR PRESSURE EXCEEDS MAXIMUM (GAUGES SHOW OVER 130 PSI [896 KPA]), SAFETY VALVE OPENS
TO RELEASE PRESSURE - Continued
STEP
3.
DOES GOVERNOR SIGNAL LINE HAVE PROPER AIR PRESSURE?
a.
Check governor line for proper air pressure.
b.
Stop engine and open all draincocks until brake system air pressure is vented.
c.
Close draincocks.
T0268DAA
Transducer
Figure 3.
Air Governor Signal Line.
d.
Disconnect governor signal line from air governor. Refer to point to point schematics.
e.
Connect adapter fitting to air governor and tee to fitting.
f.
Install pressure gauge on tee.
g.
Start engine and allow sufficient time for air to build to normal operating pressure.
h.
Pressure gauge reading should be above 80 psi.
i.
Compare pressure gauge reading with reading on instrument panel air pressure gauges.
CONDITION/INDICATION
DOES GOVERNOR SIGNAL LINE HAVE PROPER AIR PRESSURE?
DECISION
NO - Notify supervisor. Action may not be possible at this level of maintenance.
TM 9-2320-272-23-1
0129
0129-4
Back to Top
