TROUBLESHOOTING CHART
| SYMPTOM |
| CAUSE |
| REMEDY |
5. | Cannot build system air | A. | Supply pressure to the air dryer is not | A. | Ensure the supply pressure to the air dryer is greater than |
| pressure. |
| sufficient. |
| 110 psi during the system charge. |
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| B. | Kinked or blocked (plugged) discharge | B. | Check to determine if air passes through discharge line. |
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| line. |
| Check for kinks, bends, excessive carbon deposits, or ice |
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| blockage. |
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| C. | Excessive bends in discharge line | C. Discharge line should be constantly sloping from compressor | |
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| (water collects and freezes). |
| to air dryer with as few bends as possible. |
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| D. Refer to Symptom 4. | D. Refer to Symptom 4, Remedy A. | ||
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| E. Refer to Symptom 7. | E. Refer to Symptom 7, Remedies A and B. | ||
6. Air dryer does not purge or | A. | Faulty air dryer purge valve. | A. | After determining that air reaches the purge valve piston by | |
| exhaust air. |
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| installing a Tee fitting with a pressure gauge into the control |
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| port, repair purge valve if necessary. |
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| B. | See Causes B, E, and F for Symptom | B. | Refer to Symptom 4, Remedies B, E, and F. |
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| #4. |
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7. | Desiccant material being | A. | Faulty dryer cartridge. | A. | Replace the Bendix® |
| expelled from air dryer purge |
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| dryer. |
| valve exhaust (may look like |
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| B. | Excessive dryer vibration. | B. | Check the | |
| whitish liquid or paste or |
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| damage. Repair mounting and replace cartridge. |
| small beads.) |
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8. | Unsatisfactory desiccant life. | A. | Excessive system leakage. | A. Refer to Symptom 1, Remedy A. | |
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| B. Wrong vehicle application for | B. | Refer to Symptom 2, Remedy C. | |
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| air dryer. |
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| C. | Compressor passing excessive oil. | C. | Check for proper compressor installation; if symptoms |
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| persist, replace compressor. Refer to Bendix® Advanced |
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| Troubleshooting Guide for Air Brake Compressor (BW1971). |
9. | “Pinging” noise excessive | A. | Single cylinder compressor with high | A. | A slight “pinging” sound may be heard during system build- |
| during compressor loaded |
| pulse cycles. |
| up when a single cylinder compressor is used. If this sound |
| cycle. |
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| is deemed objectionable, it can be reduced substantially by |
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| increasing the discharge line volume. |
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| This can be accomplished by adding a 90 cubic inch (or |
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| larger) reservoir between the compressor and the |
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| dryer. |
10. The air dryer purge piston | A. | Compressor fails to “unload”. | A. Check the air hose from the | ||
| c y c l e s r a p i d l y i n t h e |
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| compressor for a missing, kinked, or restricted line. Install or |
| compressor unloaded (non- |
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| repair the air hose. Repair or replace the compressor unloader. |
| compressing) mode. |
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15
