Service the air compressor air strainer filter, if equipped. Refer to Air Compressor Air Strainer Filter Replacement .

1. Check all of the air compressor bracket fasteners for looseness.
2. Tighten the air compressor bracket fasteners as needed. Refer to Fastener Tightening Specifications .
3. Check the following components for looseness and tighten as needed. Refer to Fastener Tightening Specifications .

•	The air compressor oil inlet hose

•	The air compressor oil outlet hose (gasoline engine)

•	The air compressor water inlet hose

•	The air compressor water outlet hose

•	The air compressor air inlet hose (diesel engine)

•	The air compressor discharge pipe

4. Check the air compressor belt tension.Refer to Drive Belt Diagnosis . In gasoline engine.
5. Check the air compressor discharge pipe for carbon restriction.
6. Clean or replace the air compressor discharge pipe as needed.
7. Check the governor cut-in and cut-out pressures.
8. Adjust the governor cut-in and cut-out pressures as needed. Refer to Air Compressor Governor Valve Adjustment .