This DIY repair guide explains how to rebuild the pump on an air compressor. The air compressor motor drives a piston that compresses air in the pump cylinder to fill the compressor tank. Worn pump parts— such as the valve plate and seals—stop the pump from compressing the air and filling the tank. Rebuilding the air compressor pump restores the pump's ability to efficiently compress air.
If the tank won't build pressure because the pump seals or valve plate are worn, rebuild the pump using the manufacturer-approved air compressor parts. Most air compressor models use a kit for rebuilding the air compressor pump. The rebuild kit includes the cylinder sleeve, piston and seals.
Follow the steps in this repair guide and video to install the air compressor pump rebuild kit on Craftsman, Porter Cable, DeWalt and Devilbiss air compressors.