DRM™/AD-IS® AIR DRYER TROUBLESHOOTING CHART (Continued)
| SYMPTOMS | CAUSE | REMEDY | |
5. Can not build system | A. Kinked or blocked | A. Check to determine if air passes through | ||
(plugged) discharge line. | discharge line. Check for kinks, bends, | |||
| air pressure. | |||
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| excessive carbon deposits, or ice blockage. | |
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| B. Excessive bends in | B. Discharge line should be constantly sloping from | |
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| discharge line (water | compressor to air dryer with as few bends as | |
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| collects and freezes). | possible. | |
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| C. Pressure protection | C. Replace air dryer (pressure protection valves are | |
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| valve(s) in air dryer will | not serviceable). | |
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| not open. |
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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 through D. | |
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6. Air dryer does not purge | A. Faulty air dryer purge | A. After determining air reaches purge valve control | ||
| or exhaust air. | valve. | port by installing a | |
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| gauge into the governor unloader port, repair | |
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| purge valve if necessary. | |
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| B. See Causes, B, E, and | B. Refer to Symptom 4, Remedies B, E, and G. | |
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| G for Symptom #4. | Also refer to Symptom 1, Remedy B. | |
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7. | Desiccant material | A. Faulty dryer cartridge. | A. Replace | |
| being expelled from air |
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| dryer purge valve |
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| B. Excessive dryer vibration. | B. Check reservoir mounting for looseness or | ||
| exhaust (may look like | |||
| whitish liquid or paste |
| damage. Repair mounting and replace cartridge. | |
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| or small beads.) |
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8. | Unsatisfactory | A. Excessive system | A. Refer to Symptom 1, Remedy A. | |
| desiccant life. | leakage. |
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| B. Wrong vehicle application | B. Refer to Symptom 2, Remedy C. | |
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| C. Compressor passing | C. Check for proper compressor installation; if | |
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| excessive oil. | symptoms persist, replace compressor. Refer to | |
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| Bendix Advanced Troubleshooting Guide for Air | |
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| Brake Compressors (BW1971). | |
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9. | “Pinging” noise | A. Single cylinder | A. A slight “pinging” sound may be heard during | |
| excessive during | compressor with high | system build up when a single cylinder | |
| compressor loaded | pulse cycles. | compressor is used. If this sound is deemed | |
| cycle. |
| 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 | |
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| inch reservoir between the compressor and the | |
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