Bendix Commercial Vehicle Systems TROUBLE SHOOTING COMPRESSOR - Manual

*This guide is only for vehicles that use desiccant air dryers.
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.
Advanced Troubleshooting Guide
for Air Brake Compressors
*
This troubleshooting guide obsoletes and supersedes all previous published
troubleshooting information relative to Bendix ® air compressors.
Air brake charging system:
Slow build ( 9.0) . . . . . . . . . . . . . . . . . . . 9 - 10
Doesn’t build air ( 10.0) . . . . . . . . . . . . . . . . . 11
Air Dryer:
Doesn’t purge ( 14.0) . . . . . . . . . . . . . . . . . . 12
Safety valve releases air ( 12.0) . . . . . . . . . . 12
Compressor:
Constantly cycles ( 15.0) . . . . . . . . . . . . . . . 13
Leaks air ( 16.0) . . . . . . . . . . . . . . . . . . . . . . 13
Safety valve releases air ( 11.0) . . . . . . . . . . 11
Noisy ( 18.0) . . . . . . . . . . . . . . . . . . . . . . . . 13
Reservoir:
Safety valve releases air ( 13.0) . . . . . . . . . . 12
INDEX
Air Coolant
Engine
Oil
Compressor leaks coolant ( 17.0). . . . . . . . . . . . 13
Oil consumption ( 6.0) . . . . . . . . . . . . . . . . . . . . . 9
Oil Test Card results ( 1.0) . . . . . . . . . . . . . . . . . . 4
Oil is present:
On the outside of the compressor ( 2.0) . . . . . 5
At the air dryer purge/exhaust
or surrounding area ( 3.0) . . . . . . . . . . . . . . 5
In the supply reservoir ( 4.0) . . . . . . . . . . . 6 - 8
At the valves ( 5.0) . . . . . . . . . . . . . . . . . . . . . 8
At air dryer cartridge ( 7.0) . . . . . . . . . . . . . . . 9
In the ping tank or compressor
discharge aftercooler ( 8.0) . . . . . . . . . . . . . 9
Symptom Page Number
(1) Oil Leakage at Head Gasket . . . . . . . . . . . . 14
(2) System Leakage . . . . . . . . . . . . . . . . . . . . . 14
(3) Compressor Discharge and
Air Dryer Inlet Temperature . . . . . . . . . . . . 14
(4) Governor Malfunction . . . . . . . . . . . . . . . . . 14
(5) Governor Control Line . . . . . . . . . . . . . . . . . 15
(6) Compressor Unloader . . . . . . . . . . . . . . . . . 15
BASIC Test Information . . . . . . . . . . . . . . . . 17-19
Test Procedures
Maintenance Schedule and Usage Guidelines
(Table A) . . . . . . . . . . . . . . . . . . . . 3
Symptom Page Number
Maintenance & Usage Guidelines
Note: The technical bulletins referenced in this
document are available at www.Bendix.com.