Bendix Commercial Vehicle Systems TU-FLO 750 COMPRESSOR 6/08 - Manual (Page 16)

*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) . . . . . . . . . . . . . . . . . . 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
INDEX
Air Coolant
Engine
Oil
Compressor leaks coolant (17.0). . . . . . . . . . . . 28
Oil consumption (6.0) . . . . . . . . . . . . . . . . . . . . 24
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
Symptom Page Number
(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 . . . . . . . 32-34
Test Procedures
Maintenance Schedule and
Usage Guidelines (Table A) . . . . 18
Symptom Page Number
Maintenance & Usage Guidelines
16