This troubleshooting guide obsoletes and supersedes all previous published
troubleshooting information relative to Bendix air compressors.
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.
INDEX
Symptom | Page Number |
Air
Air brake charging system:
Slow build (9.0) . . . . . . . . . . . . . . . . . 24 - 25 Doesn’t build air (10.0) . . . . . . . . . . . . . . . 26
Air dryer:
Doesn’t purge (14.0) . . . . . . . . . . . . . . . . . 27 Safety valve releases air (12.0) . . . . . . . . . 27
Compressor:
Constantly cycles (15.0) . . . . . . . . . . . . . . 27 Leaks air (16.0) . . . . . . . . . . . . . . . . . . . . . 28 Safety valve releases air (11.0) . . . . . . . . . 26 Noisy (18.0) . . . . . . . . . . . . . . . . . . . . . . . . 28
Reservoir:
Safety valve releases air (13.0) . . . . . . . . . 27
Symptom | Page Number | |
Coolant |
|
|
Compressor leaks coolant (17.0) . | . . . . . . | . . . 28 |
Engine |
|
|
Oil consumption (6.0) | . . . . . . | . . . 24 |
Oil |
|
|
Oil Test Card results (1.0) | . . . . . . | . . . 19 |
Oil is present: |
|
|
On the outside of the compressor (2.0) | . . . 20 | |
At the air dryer purge/exhaust |
|
|
or surrounding area (3.0) . . | . . . . . . | . . . 20 |
In the supply reservoir (4.0) . . . | . . . . . | 21 - 23 |
At the valves (5.0) | . . . . . . | . . . 23 |
At air dryer cartridge (7.0) . . . . | . . . . . . | . . . 24 |
In the ping tank or compressor |
|
|
discharge aftercooler (8.0) . | . . . . . . | . . . 24 |
Test Procedures
(1) Oil Leakage at Head Gasket . . . 29
(2) System Leakage . . . . . . . . . . . . 29
(3) Compressor Discharge and
Air Dryer Inlet Temperature . . . . 29
(4) Governor Malfunction . . . . . . . . 30
(5) Governor Control Line . . . . . . . . 30
(6) Compressor Unloader . . . . . . . . 30
BASIC Test Information . . . . . .
16
Maintenance & Usage Guidelines
Maintenance Schedule and
Usage Guidelines (Table A) . . 18
*This guide is only for vehicles that use desiccant air dryers.
