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Advanced Troubleshooting Guide for Air Brake Compressors
The guide consists of an introduction to air brake charging system components, a table
showing recommended vehicle maintenance schedules, and a troubleshooting symptom
and remedy section with tests to diagnose most charging system problems.
Symptom
Air
Air brake charging system:
Slow build (9.0) .....................................A-9-10
Doesn't build air (10.0) ............................. A-11
Air dryer:
Doesn't purge (14.0) ................................ A-12
Safety valve releases air (12.0) ............... A-12
Compressor:
Constantly cycles (15.0) .......................... A-12
Leaks air (16.0) ........................................ A-13
Safety valve releases air (11.0) ............... A-11
Noisy (18.0) ............................................ A-13
Reservoir:
Safety valve releases air (13.0) ............... A-12
Test Procedures
(1) Oil Leakage at Head Gasket .....A-14
(2) System Leakage .......................A-14
(3) Compressor Discharge and
Air Dryer Inlet Temperature ...........A-15
(4) Governor Malfunction ................A-14
(5) Governor Control Line ...............A-15
(6) Compressor Unloader ...............A-15
BASIC
™
Test Information ........ A-16-18
Appendix A
INDEX
Page Number
Symptom
Coolant
Compressor leaks coolant (17.0)....................A-13
Engine
Oil consumption (6.0) ......................................A-9
Oil Test Card results (1.0) .................................A-4
Oil is present:
Oil
On the outside of the compressor (2.0) ......A-5
At the air dryer purge/exhaust
or surrounding area (3.0) ........................A-5
In the supply reservoir (4.0) .................... A-6-8
At the valves (5.0) .......................................A-8
At air dryer cartridge (7.0) ...........................A-9
In the ping tank or compressor
discharge aftercooler (8.0) ......................A-9
Maintenance & Usage Guidelines
Maintenance Schedule and
Usage Guidelines (Table A) ..... A-3
Page Number
A-1
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