TM-9-2320-273-10

TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; OPERATOR’S MANUAL

DECEMBER 2012
TM-9-2320-273-10

  TM-9-2320-273-10 - Page 284 of 452

AIR SYSTEM AND BRAKES - CONTINUED
SYMPTOM
Air system loses pressure during tractor operation or low air pressure warning lamp
and buzzer come on during tractor operation.
MALFUNCTION
Leak in vehicle air system.
CORRECTIVE ACTION
1. Check trailer air supply control is pulled out (OFF).
2. Operate engine until warning lamp and buzzer go off and release
parking brake.
3. Stop engine and note reservoir pressure.
4. Fully depress and hold service brakes for 2 minutes.
5. Check for leaks. Reservoir pressure loss should not exceed 5 psi in
2 minutes. Close any open reservoir drains. Check trailer air supply
control is pulled out (OFF). If any leaks are found, notify supervisor.
6. If pressure loss does not exceed 5 psi in 2 minutes, check trailer air
system in the next malfunction.
MALFUNCTION
Leak in trailer air system.
CORRECTIVE ACTION
1. Push trailer supply control in (ON) to charge trailer air reservoirs.
2. Operate engine until warning lamp and buzzer go off, then release
parking brake.
3. Stop engine and note reservoir pressure.
4. Fully depress and hold service brakes for 2 minutes.
5. Check for leaks. Reservoir pressure loss should not exceed 5 psi in
2 minutes. Note any trailer air leaks. If reservoir pressure loss exceeds
5 psi in 2 minutes, notify supervisor to troubleshoot trailer.
SYMPTOM
Trailer brakes will not release.
MALFUNCTION
Trailer brake control is in ON position.
CORRECTIVE ACTION
Check trailer brake control is in OFF position. Move control to OFF position
(WP 0005).
TM 9-2320-273-10
0023
0023-10


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