2. One of those problems is often confused as a pressure switch or unloader valve leak. ... for bad double check valve causing back flow to foot valve. 3. Defective unloader or check valve. Loosen belt. Replace or repair. Once the compressed air passes the check valve, there is no way it can go back again. Loud hissing or excessive air leakage sounds mean that you have a leak somewhere at a fitting or an unloader valve is damaged and is allowing air to go where it shouldn’t. Master Tool Repair, is not affiliated with, or sponsored or endorsed by, any of the original equipment manufacturers whose names, logos, and/or trademarks are displayed on this page. Special Note about Unloader Valves- Unloader valves do just what the name implies, it is designed to "unload" the pump and air lines after motor shutdown. Disconnect both sides of compressor and air pressure governor tube. Unloader valve — One of the potential valve issues is air becoming trapped above the pistons. The extra load can sometimes stall the motor. Cummins has procedure for the air compressor valve unloader cleaning. In the event your pressure switch or unloader valve is bleeding air constantly, the problem may not be either. Read about leaking unloader valves on the pressure switch and how to fix them on this site. Types of compressor unloader valves. The unloader valve that is shown in the image above is typically found on the side of a compressor pressure switch, and is operated by a toggle lever coming out of the side of the pressure switch. The compressor check valve may be the issue. If the compressor starts without the intake filter, replace the filter and see if that fixes the problem. Repair or replace #21 . Intake filter — Remove the intake filter and start the air compressor again without it. So, today I am going to provide an article on air compressor check valve troubleshooting, to help you get over the problems. Put some rug over compressor discharge opening . Master Tool Repair is an authorized re-seller of all products listed throughout our site. Air pressure should be drained to ZERO. Loss of power: Plug compressor into a new power source Safety glasses is ON !!!!! Replace check valve #12 or #19. Air leaking from the unloader while the motor is running is an indication of a bad unloader valve. Depending on the make and size of compressor, the unloader valve may take many forms. Check engine or compressor air cleaner - replace as necessary. 4. Belt to tight. The compressor's unloader mechanism and governor (along with a synchro valve for the Bendix® DuraFlo™ 596 air compressor) control the brake system air pressure between a preset maximum and minimum pressure level by monitoring the pressure in the service (or “supply”) reservoir. Replace foot valve … However, problems in the check valve cause troubles for an air compressor. The check valve is an important part of an air compressor. 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