TM 9-2320-303-10
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 2-12) and check for air leaks at air reservoirs,
hoses, fittings, and intervehicular air hose connections.
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 pressure. 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 semitrailer 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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