TM 9-2320-363-10
Table 3-1. Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AIR SYSTEM AND BRAKES
1.
AIR RESERVOIR PRESSURE LOW (WARNING LIGHT AND BUZZER ARE
ON).
Step 1.
Check whether air reservoir draincocks are closed.
Close draincocks.
Step 2.
If vehicle is not coupled to a semitrailer, check position of
trailer air supply control knob.
Pull knob out (OFF).
Step 3.
Start engine (paragraph 2-14) and check for air leaks at air
reservoirs, hoses, fittings, and intervehicular air hose connec-
tions.
If air leaks are present, notify Unit Maintenance.
Step 4.
Perform semitrailer troubleshooting.
2.
AIR SYSTEM LOSES PRESSURE DURING VEHICLE OPERATION OR
LOW AIR PRESSURE WARNING LIGHT AND BUZZER COME ON DURING
VEHICLE OPERATION.
NOTE
Any change in pressure on brake pedal will cause a
change in air pressure reading.
Step 1.
Ensure trailer air supply control knob is pulled out (OFF).
Operate engine until warning light and buzzer go off and
release parking brake. Stop engine and note reservoir pres-
sure. Fully press and hold service brake pedal for two minutes.
Have crewmember check for leaks. Reservoir pressure loss
during two minute period should not exceed 5 psi (34 kPa).
Close air reservoir draincocks. If leaks are present, notify
Unit Maintenance.
NOTE
Any change in pressure on brake pedal will cause a
change In air pressure reading.
Step 2.
Push trailer air supply control knob in (ON) to charge semi-
trailer air reservoirs and repeat step 1. Have crewmember
check semitrailer for leaks. Pressure loss should not exceed
5 psi (34 kPa) in two minutes.
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