Bendix® AD-9® AND AD-9® IPC AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS | CAUSE | REMEDY | |||
7. Air dryer does not purge or | A. | Missing, broken, kinked, frozen, | A. Inspect control line from governor UNL (unloader) port to control | ||
| exhaust air. |
| plugged or disconnected purge |
| port of air dryer. Test to determine if air flows through purge |
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| control line. |
| control line when compressor unloaded. Check for undrilled |
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| fittings. (See Symptom #4, Remedy C.) |
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| B. | Faulty air dryer purge valve. | B. | After determining air reaches purge valve (Remedy A above), |
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| repair purge valve. |
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| C. | See Causes, B, E, G for Symptom | C. | Refer to Remedies B, E, G for Symptom #4. |
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| #4. |
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8. | Desiccant material being | A. | This symptom is almost always | A. | See Causes and Remedies for Symptoms 1, 2, 3, 4 and 5. |
| expelled from air dryer purge |
| accompanied by one or more of |
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| valve exhaust (may look like |
| Symptoms 1, 2, 3, 4 and 5. See |
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| whitish liquid or paste or |
| related causes for these symptoms |
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| small beads.) |
| above. |
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| - OR - | B. | Air dryer not securely mounted. | B. | Vibration should be held to minimum. Add bracket supports or |
| Unsatisfactory desiccant life. |
| (Excessive vibration.) |
| change air dryer mounting location if necessary. |
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| C. | Malfunctioning or saturated | C. | Replace desiccant cartridge assembly. |
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| desiccant cartridge. |
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| D. | Compressor passing excessive oil. | D. Check for proper compressor installation; if symptoms persist, | |
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| replace compressor. |
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| E. | Desiccant cartridge not assembled | E. | C h e c k t h e t o r q u e o n t h e d e s i c c a n t c a r t r i d g e |
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| properly to end cover. (Loose |
| to end cover attachment. Refer to assembly section of this |
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| attachment) |
| data sheet. |
9. | “Pinging” noise excessive | A. | Defective check valve assembly in | A. | Refer to Remedy C, Symptom #1. |
| during compressor loaded |
| air dryer end cover. |
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| cycle. |
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| B. | Leaking Turbo | B. Repair or replace purge valve assembly. | |
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| C. | Leaking purge valve control piston | C. | Repair or replace purge valve assembly. |
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10. Constant seepage of air at | A. | Defective check valve assembly in | A. | Refer to Remedy C, Symptom #1. | |
| air dryer purge valve exhaust |
| air dryer end cover. |
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| B. | Leaking Turbo | B. Repair or replace purge valve assembly | ||
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| C. | Leaking purge valve control piston | C. | Repair or replace purge valve assembly. |
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11. | The air dryer purge piston | A. | Compressor fails to “unload”. | A. | Faulty governor installation; no air line from governor to |
| c y c l e s r a p i d l y i n t h e |
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| compressor or line is kinked or restricted. Install or repair air |
| compressor unloaded (non- |
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| line. |
| compressing) mode. |
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