Bendix® AD-9® AND AD-9® IPC AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS | CAUSE | REMEDY |
2. Water and/or Oil in Supply | (Continued) | Purge Cycle Time - During normal vehicle operation, the |
o r S e r v i c e R e s e r v o i r |
| air compressor must remain unloaded for a minimum of 20 |
(continued). |
| seconds for the standard Bendix® |
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| dryer or 30 seconds for the extended purge model. These |
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| minimum purge times are required to ensure complete |
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| regeneration of the desiccant material. If the purge time is |
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| consistently less than the minimum, an accessory |
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| system must be installed. Consult your local authorized Bendix |
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| parts outlet or sales representative for additional information. |
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| European Air Brake Systems - Brake systems that incorporate |
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| compressors without integral unloading mechanisms and/ |
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| or utilize a compressor discharge line unloader valve have |
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| special air dryer installation requirements. Consult your local |
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| authorized Bendix parts outlet or sales representative for |
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| additional information. |
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| Air Compressor Size - Although the |
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| IPC air dryers can be used in conjunction with larger |
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| compressors, it was designed primarily for units rated for |
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| up to 17 CFM. It is recommended that when using the |
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| |
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| rated displacement exceeding 17 CFM that an authorized |
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| Bendix parts outlet or Bendix marketing representative |
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| be contacted for assistance. |
| G. Air compressor discharge and/or | G. Restricted discharge line. See Appendix A, Table A, column 1 |
| air dryer inlet temperature too high. | & 2 for recommended sizes. If discharge line is restricted or |
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| more than 1/16” carbon build up is found, replace the discharge |
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| line. Replace as necessary. |
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| Discharge Line |
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| constant slope down from the compressor to the air dryer inlet |
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| fitting to avoid low points where ice may form and block the flow. |
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| If, instead, ice blockages occur at the air dryer inlet, insulation |
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| may be added here, or if the inlet fitting is a typical 90 degree |
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| fitting, it may be changed to a straight or 45 degree fitting. For |
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| more information on how to help prevent discharge line freeze- |
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| ups, see Bendix Bulletins |
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| Shorter discharge line lengths or insulation may be required in |
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| cold climates. |
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| Insufficient coolant flow through compressor. Inspect coolant line. |
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| Replace as necessary (I.D. is 1/2” min.). Inspect the coolant lines |
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| for kinks and restrictions and fittings for restrictions. Replace as |
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| necessary. Verify coolant lines go from engine block to compressor |
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| and back to the water pump. Repair as necessary. |
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| Restricted air inlet (not enough air to compressor). Check |
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| compressor air inlet line for restrictions, brittleness, soft or sagging |
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| hose conditions, etc. Repair as necessary. Inlet line size is 3/4 ID. |
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| Maximum restriction requirement for compressors is 25 inches |
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| of water. Check the engine air filter and service if necessary (if |
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| possible, check the air filter usage indicator). |
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