How to Replace an Air Compressor Pressure Switch



This video from Sears PartsDirect shows how to replace a broken pressure switch in an air compressor. The pressure switch turns the air compressor pump on and off to regulate tank air pressure. If the compressor is not cycling off and on at the pressures specified in the owner’s manual, you may need to replace the pressure switch.

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The video includes these parts and tools. Look up your model to make sure you get the right parts for your air compressor.
Pressure switch
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Transcript:
The pressure switch turns the air compressor pump on and off to regulate tank air pressure. If the compressor is not cycling off and on at the pressures specified in the owner’s manual, replace the pressure switch using the steps in this video. Before you begin, wear work gloves to protect your hands. Unplug the air compressor’s power cord from the wall outlet. Pull the ring on the safety valve to bleed all air pressure from the tank. Unscrew the tank pressure gauge and remove it from the pressure switch. Unscrew the pressure switch tube fittings from the check valve and pressure switch. Remove the pressure switch tube. Unscrew the pressure regulator assembly and remove it from the pressure switch. Remove the pressure switch cover. Disconnect the two black wires from the pressure switch. Pull the two power cord strain reliefs off the pressure switch. Disconnect the two green wires from the pressure switch. Unscrew the safety valve and remove it from the pressure switch. Unscrew the pressure switch assembly from the pipe connected to the tank. Apply thread-sealing tape to the tank pipe. Screw the new pressure switch onto the tank pipe. Tighten the pressure switch and align the check valve tube fitting. Apply thread-sealing tape to the threads of the safety valve. Screw the safety valve into the new pressure switch and tighten firmly. Remove the new pressure switch cover. Insert the power cord strain relief into the strain relief bracket. Connect the wires to the new pressure switch. Reinstall the pressure switch cover. Apply thread-sealing tape to the pressure regulator connecting pipe threads. Screw the pressure regulator and pipe into the new pressure switch and tighten firmly with the tank gage fitting facing up. Reconnect the pressure switch tube to the check valve and the pressure switch. Tighten the fittings firmly. Apply thread-sealing tape to the tank pressure gauge threads. Screw the pressure gauge onto the pressure regulator and tighten the gauge firmly. Plug the air compressor into the electrical outlet.

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3 thoughts on “How to Replace an Air Compressor Pressure Switch

  1. What you are showing here is the exact one i own. But it was bought so long ago, I do not have the manual, cannot find the model number, etc. – so am at a disadvantage calling up Parts to order the pressure switch you are showing. Please provide me the model number of the compressor in this video. Thanks. ddd

  2. When I turn my compressor on it runs for about 1 or 2 seconds, and then it kicks my electric panels breaker. Do you know what could be causing this? Thank you.

  3. does it matter where you put the regulator and the blowoff and mounting to the tank. are all four holes common or do they each have there own purpose.

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