Bendix® AD-9® AND AD-9® IPC AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS | CAUSE | REMEDY |
1. Dryer is constantly “cycling” | A. Excessive system leakage. | A. If leakage IS SHOWN on gauges, test for excessive service |
or purging. Dryer purges | IMPORTANT: Note whether air | brake system leakage. |
frequently (every 4 minutes | pressure loss is shown on dash | Allowable leakage: |
or less while vehicle is idling). | gauge(s). Pressure loss shown on | |
| gauges is caused by service brake | |
| Tractor trailer - 3 psi / minute. | |
| system or component leakage. | |
| Pressure loss NOT SHOWN | 121 vehicles, single vehicle - 1 psi / minute per service reservoir. |
| on gauges is caused by supply | Tractor trailer - 3 psi / minute per service reservoir. Repair and |
| system or component leakage. | |
| retest as required. | |
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If leakage is NOT SHOWN on gauges test for excessive supply system leakage.
Remove drain cock or valve in supply reservoir (wet tank) and install air gauge. Build system pressure, allow air dryer to purge and observe air gauge in supply reservoir. Pressure drop should not exceed 1 psi per minute.
Perform tests 1 to 6 in the order presented.
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