Table 3-1. Troubleshooting
TEST OR INSPECTION
AIR SYSTEM AND BRAKES
AIR RESERVOlR PRESSURE LOW (WARNING LAMP AND BUZZER ARE ON).
Check that all reservoir draincocks are closed.
Close all draincocks.
If tractor is not coupled to a trailer, check that trailer air supply
control is pulled out (OFF).
Pull trailer air supply control out.
Check for possible air leaks at air reservoirs, hoses, fittings, and at
intervehicular air hose connections.
Notify Organizational Maintenance of any leaks.
If tractor is coupled to semitrailer, and your tests and inspections
of truck do not reveal any trouble with truck air system, trouble-
If your tests, inspections, and corrective actions for both
tractor and semitrailer do not solve the low air pressure
problem, notify Organizational Maintenance.
AIR SYSTEM LOSES PRESSURE DURING TRUCK OPERATION OR LOW AIR
PRESSURE WARNING LAMP AND BUZZER COME ON DURING TRUCK
Make sure that trailer air supply control is pulled out, operate
engine until warning lamp and buzzer go off, and release parking
brake. Stop engine and note reservoir pressure. Fully depress and
hold service brake pedal for 2 minutes. Have crew member check
for leaks. Reservoir pressure loss during 2-minute period should not
exceed 5 psi.
Close any open reservoir drains; make sure that trailer air
supply control is pulled out. If you find any other leaks,
notify Organizational Maintenance.
If pressure loss in test above does not exceed 5 psi in 2 minutes,
push in trailer air supply control to charge semitrailer air reservoirs
and repeat the test procedure. Have crew member check semi-
trailer for leaks. Pressure loss should not exceed 5 psi in 2 minutes.
Note any semitrailer air leaks. If reservoir pressure loss
exceeds 5 psi in 2 minutes, troubleshoot the semitrailer.