Symptom Tree
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Air system leaks |
Block the vehicle wheels and check the air system for leaks with spring brakes applied and released. Check for leaks from the air compressor gaskets and the air system hoses, fittings, tanks, and valves. Refer to the OEM service manual. |
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Carbon buildup is excessive in the air discharge line, check valve, or cylinder head |
Check for carbon buildup. Replace the air compressor discharge line, if necessary. Refer to Procedure 012-003 (Air Compressor Carbon Buildup) in Section 7. |
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Air compressor pumping time is excessive |
Replace the desiccant cartridge on the air dryer (if equipped). Refer to the OEM service manual. Check the air compressor duty cycle. Install a larger air compressor, if necessary. Refer to the Master Repair Manual, Holset Air Compressors, Bulletin 3666121. |
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| Contact a Cummins Authorized Repair Facility |
