DRM™/AD-IS® AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS | CAUSE | REMEDY |
2. Water in vehicle | A. Maximum air dryer inlet | A. Check for excessive carbon build up in |
reservoirs. | temperature is | compressor discharge line. Replace if |
| exceeded due to | required. Make certain that discharge line |
| improper discharge line | length is at least 6 ft. Increase discharge line |
| length. | length and/or diameter to reduce air dryer inlet |
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| temperature. |
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| B. Air system charged from | B. If system must have outside air fill provision, |
| outside air source | outside air should pass through air dryer. |
| (outside air not passing |
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| through air dryer). |
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| C. Excessive air usage - | C. Note: The |
| Air dryer not compatible | use on applications with excessive air usage. |
| with vehicle air system | The following applications require more dry air |
| requirement (Improper | than the |
| Do not use on: | |
| air dryer/vehicle | |
| 1) City buses. | |
| application). | |
| 2) Vehicle combinations with more than 8 braked | |
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| |
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| axles. |
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| 3) City refuse vehicles except those with work |
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| brakes. |
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| 4) Concrete mixers. |
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| 5) Dump trucks with more than 3 axles. |
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| 6) |
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| than 7 braked axles. |
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| 7) Vehicles with compressor on times in excess |
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| of 20%. |
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| If the vehicle is equipped with high air usage |
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| accessories such as trailer |
|
| central tire inflation, the air for these accessories |
|
| must |
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| D. Desiccant requires | D. Replace desiccant cartridge assembly. |
| replacement. |
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| E. Air | E. If vehicle uses Holset compressor, inspect |
| cartridge assembly. | feedback check valve for proper installation and |
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| operation. |
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| F. Air dryer not purging. | F. Refer to Symptom 6. |
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| G. Purge (air exhaust) time | G. Refer to Symptom 1. |
| insufficient due to |
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| excessive system |
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| leakage. |
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