Wabco Air Compressors Caterpillar


Air Compressor Fails to Unload

Usage:

3126E 9SZ

Symptom

The air compressor will not cycle to the unloaded position.

Probable Cause

  • Faulty governor or governor installation

Test the governor for proper operation. Check for restrictions in the air line that connects to the governor.

Repair the governor or replace the governor, if necessary. Repair the air lines or replace the air lines, if necessary.

  • Faulty unloader valve

Inspect the unloader valve for wear. Replace the cylinder head if the unloader valve does not operate properly.

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