BENDIX® AD-IP® AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS | CAUSE | REMEDY | ||
2. Water and/or oil in | G. Compressor malfunction. | G. If you found excessive oil present in the service | ||
the supply or service |
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| reservoir and you did not find any issues above, |
reservoir (continued). |
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| the compressor may be passing oil. Test the |
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| compressor using the Bendix® BASIC™ cup method |
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| as described in the Bendix compressor service |
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| manual and referred to in Appendix A, Table A, |
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| column 5. |
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| Replace compressor. If still under warranty, follow |
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| normal warranty process. |
| H. Air | H. If the vehicle uses a Holset® compressor, inspect | ||
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| cartridge assembly. |
| the feedback check valve for proper installation and |
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| operation. When replacing the desiccant cartridge, |
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| make sure the desiccant cartridge assembly is |
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| properly installed and the sealing rings are in place |
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| on the mounting surface of the desiccant cartridge. |
| I. | Desiccant requires | I. | Replace the desiccant cartridge assembly. |
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| replacement. |
| Refer to Appendix A, Table A columns 3 & 4 for |
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| recommended intervals. |
3. Oil present at the 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 the regular maintenance is being |
maintenance. |
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| performed and that the amount of oil in the air tanks |
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| (reservoirs) is within the acceptable range shown on |
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| the BASIC cup (see also column 5 of Appendix A, |
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| Table A). Replace the air dryer cartridge as needed |
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| and return the vehicle to service. |
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| B. The Bendix® | |
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| dryer removes more oil from the brake system than |
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| the standard Bendix® |
4. Safety valve on the air | A. Restriction between air dryer | A. Check to determine if air is reaching the supply | ||
dryer “popping off” or |
| and supply (first) reservoir. |
| reservoir. Inspect for kinked tubing or hose. Check |
exhausting air. |
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| for undrilled or restricted hose or tubing fittings and |
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| repair or replace as needed. |
| B. Air dryer safety valve | B. Verify the relief pressure is at the vehicle or | ||
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| malfunction. |
| component manufacturer specifications. Replace |
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| if malfunctioning. |
| C. Desiccant cartridge | C. Refer to Table A and column 3. Check the | ||
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| maintenance required. |
| compressor for excessive oil passing and/or correct |
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| compressor installation. Repair or replace as |
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| necessary. Replace the desiccant cartridge. |
| D. Malfunctioning discharge | D. Test to determine if air is passing through the check | ||
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| check valve in the end cover |
| valve. Repair or replace. |
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| of the |
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| E. Excessive pressure | E. Increase the volume in the discharge line by | ||
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| pulsations from the |
| increasing the length or diameter. Add a ping tank |
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| compressor. (Typical single |
| (small reservoir). |
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| cylinder type.). |
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| F. | Governor malfunction. | F. | Test the governor operation and/or inspect the |
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| Missing or restricted |
| control line leading from the governor UNL |
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| governor control line |
| (unloader) port to the air dryer control port. |
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| installation. |
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