Bendix® AD-9® AND AD-9® IPC AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS | CAUSE | REMEDY | |
2. Water and/or Oil in Supply or | A. Desiccant requires replacement | A. | Replace desiccant cartridge. |
Service Reservoir. | - excessive contaminants in |
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| desiccant cartridge assembly. |
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| B. Improper discharge line length or | B. | Refer to section entitled Connecting the Air Lines as well as |
| improper line material. Maximum |
| Appendix A, Table A columns 1 & 2 then check line size and |
| air dryer inlet temperature is |
| length. |
| exceeded. |
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| C. Air system charged from outside | C. If system must have outside air fill provision, outside air should | |
| air source (outside air not passing |
| pass through the air dryer. This practice should be minimized. |
| through air dryer) |
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| D. Air dryer not purging (see | D. | See Symptom #5. |
| Symptom #5). |
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| E. Purge (air exhaust) time insufficient | E. | Check causes and remedies for Symptom #1. |
| due to excessive system leakage |
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| (see causes for Symptom #1). |
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| F. Excessive air usage, duty cycle | F. | See Appendix A, Table A, column 1, for recommended |
| too high - Air dryer not compatible |
| compressor sizes. If the compressor is “too small” for the |
| with vehicle air system requirement |
| vehicle vocation (for example, where a vehicle’s vocation has |
| (Improper air dryer/vehicle |
| changed or service conditions exceed the original vehicle or |
| application). |
| engine OE spec’s) then upgrade the compressor. Note: The |
| NOTE: Duty Cycle is the ratio of |
| costs incurred (e.g. installing a larger capacity compressor, |
| time the compressor spends building |
| etc.) are not covered under original compressor warranty. |
| air to total engine running time. Air |
| Charge Cycle Time - Bendix® |
| compressors are designed to build air |
| are designed to provide clean, dry air for the brake system. |
| (run “loaded”) up to 25% of the time. |
| When a vehicle’s air system is used to operate |
| Higher duty cycles cause conditions |
| accessories it is necessary to determine that; during normal, |
| that affect air brake charging system |
| daily operation the compressor should recover from governor |
| performance which may require |
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| additional maintenance. Factors |
| 90 seconds or less at engine RPM’s commensurate with the |
| that add to the duty cycle are: air |
| vehicle vocation. If the recovery time consistently exceeds |
| suspension, additional air accessories, |
| this limit, it may be necessary to “bypass” the air accessory |
| use of an undersized compressor, |
| responsible for the high air usage. An example of where a |
| frequent stops, excessive leakage from |
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| fittings, connections, lines, chambers or |
| is used to pressurize a tank trailer for purposes of |
| valves, etc. |
| product. Consult your local authorized Bendix parts outlet or |
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| sales representative for additional information. |
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