Bendix Commercial Vehicle Systems BENDIX 720CC COMPRESSOR - Manual (Page 15)

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Appendix A
Advanced Troubleshooting Guide for Air Brake Compressors
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
INDEX
Air Coolant
Engine
Oil
Compressor leaks coolant ( 17.0)....................A-13
Oil consumption ( 6.0) ......................................A-9
Oil Test Card results ( 1.0) .................................A-4
Oil is present:
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
Symptom Page Number
(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
Test Procedures
Maintenance Schedule and
Usage Guidelines (Table A) .....
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Symptom Page Number
Maintenance & Usage Guidelines
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.