Bendix® AD-RP™ AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS |
| CAUSE | REMEDY | |
2. Water and/or oil in | F. | Air compressor discharge | Poorly fi ltered inlet air (poor air quality to compressor). | |
supply or service |
| and/or air dryer inlet | Check for leaking, damaged or malfunctioning | |
reservoir. (continued) |
| temperature is too high. | compressor air inlet components (e.g. induction line, | |
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| (continued) | fi ttings, gaskets, fi lter bodies, etc.). Repair the inlet | |
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| components as needed. Note: Dirt ingestion will | |
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| damage the compressor and is not covered under | |
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| warranty. If you found excessive oil in the service | |
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| reservoir and you did not fi nd any issues above, | |
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| the compressor may be passing oil. Replace the | |
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| compressor and — if still under warranty — follow | |
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| the normal warranty process. | |
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| G. Compressor malfunction. | G. If you found excessive oil present in the service | ||
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| reservoir and you did not fi nd any issues above, the | |
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| compressor may be passing oil. Test the compressor | |
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| using the Bendix® BASIC™ cup method as described | |
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| in the Bendix compressor service manual and | |
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| referred to in Appendix A/Table A/column 5. Replace | |
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| the compressor and — if it is still under warranty — | |
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| follow the normal warranty process. | |
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| H. Air | H. When replacing the desiccant cartridge, make sure | ||
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| cartridge assembly. | the desiccant cartridge assembly is properly installed | |
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| and sealing rings are in place on the mounting | |
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| surface of the desiccant cartridge. | |
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| I. | Desiccant cartridge requires | I. Replace the desiccant cartridge assembly. Refer to | |
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| replacement. | Appendix A/Table A/columns 3 & 4 for recommended | |
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| intervals. | |
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3. Oil present at air | A. Air brake charging system is | A. Air dryers remove water and oil from the air brake | ||
dryer purge exhaust |
| functioning normally. | charging system. A small amount of oil is normal. | |
or cartridge during |
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| Check that regular maintenance is being performed | |
maintenance. |
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| and that the amount of oil in the air tanks (reservoirs) | |
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| is within the acceptable range shown on the BASIC | |
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| cup (see also column 5 of Appendix A/Table A). | |
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| Replace the air dryer cartridge as needed and return | |
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| the vehicle to service. | |
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4. Air is escaping from | A. Air dryer purge valve | A. Repair or replace air dryer purge valve. | ||
air dryer exhaust |
| leaking. |
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during the charge |
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B. Compressor unloader | B. One or both dash air gauges should show higher than | |||
cycle but able to build |
| mechanism malfunction. | normal air pressure. Test the compressor unloader | |
system air pressure. |
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| mechanism for proper operation. Repair or replace | |
(Compressor |
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| unloaders as necessary. | |
pumping.) |
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C. Governor malfunction. | C. One or both dash air gauges may show higher than | |||
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| normal air pressure. Test the governor for proper | |
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| operation. Repair or replace as necessary. | |
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(continued)
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