The pressure switch contacts seem welded together, inspect and verify. Replace the switch as necessary. How? Get a compatible replacement, disconnect it electrical and plumbing, remove and replace accordingly, use thread sealer.
What? If it won't shut off when it trips the limit valve. You need to replace the pressure switch.
SOURCE: Air compressor head gasket diagram
Campbell hausfeld has all their manuals on line at www.chpower.com / you can enter the model # of the whole unit or just the # of the pump. Also you can enter just a partial number example wl650 for a list of models is that range. Use caution when installing gaskets for chpower oiless pumps. Some of their gaskets are very brittle. After installing parts, turn pump by hand to make sure all parts are in their proper place and that there is suction. Enjoy
SOURCE: Mastercraft 2.0 hp air compressor will not build up over 25 psi
sounds like a bad or broken valves in the head. crankcase needs a vent which is sometimes a small hole drilled into the oil fill plug and will normally blow some air out the vent while it runs
SOURCE: Dewalt 4 gal air compressor will not build pressure in take.
The bleed valve is an unloader of sorts that allows the compressor to start with-out a load. It closes when the pressure in the airline reaches about 20-25lbs with good volume. If air volume is not sufficient, the valve will not close. To solve the problem lets do a few tests. A long cord will reduce power and reduce air volume. Try powering the compressor with-out extension cord. If bleed valve closes when you do not use a cord, the compressor is not getting enough voltage, use shorter cord of the 12 gauge quality and more hose to reach work. If valve still does not close, check for air leaks on all fittings including around pressure switch and drain valve with soapy water. Repair as necessary and retest. If no leaks were found, temporarily plug bleed valve port with screw/bolt and run compressor till set pressure cut-off while counting minuites/seconds. The compressor should fill and shut off within three minutes or so. If it takes an unusually long time to fill, then the reed valves /valve plate is worn and leaking pressure back into cylinger. Leaking valves will usually result in very hot discharge airline/air. Reinstall the bleed valve after test. Parts and partslist are available at www.toolpartsdirect.com . Good luck on the repair and email if you have other questions.
SOURCE: Campbell Hausfeld Air Compressor won't start
The compressor starting problem is common to most of the small portable compressors. Poor design and undersized components are to blame. If you have one of these units i suggest looking into a product called the Smart Start by Conrader Valves. It is interchangeable with the standard air filters and allows the compressor to start without fail. check it out- www.conrader.com.
SOURCE: husky 25 gallon air compressor turns on and off Y6020-WK
Pressure switch setting is off. Readjust to Mfg. spec. (on @ 60/off @ 8o...)
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