Symptom Tree t004
| Cause | Correction |
|---|
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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 Procedure 012-019 and the OEM service manuals. Turn the keyswitch ON. Walk around the engine and listen for air leaks. |
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|
Carbon buildup is excessive in the air discharge line, downstream air valves, or cylinder head |
Check for carbon buildup. Replace the air compressor discharge line and cylinder head assembly if necessary. Refer to Procedure 012-003. |
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|
Air system component is malfunctioning |
Check the operation of air system valves, air dryers, and other OEM-installed air system components. Refer to the OEM service manual. |
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|
Air intake system restriction to air compressor is excessive |
Replace the air compressor air cleaner (if installed). Check the air intake piping. Check engine air intake restriction if the air compressor inlet is plumbed to the vehicle or equipment intake system. Refer to Procedure 010-031. |
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|
Air compressor intake or exhaust system leaks air |
Inspect the air compressor head assembly and replace if required. Refer to Procedure 012-003. |
