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How do I replace a Pressure Switch in an Air Compressor?

If the pressure switch fails to shut off the air compressor at the cut-out pressure setting, the safety valve pops open to relieve the excessive air pressure. The safety valve must be replaced if it leaks or pops open.

The air compressor pump can be turned on and off by the pressure switch. The pressure switch should be replaced if the compressor isn't cycling on and off.

The check valve keeps the tank air out of the pump. A failed check valve will cause high air pressure to be applied to the head of the pump preventing the motor from restarting once the tank has been filled. The check valve needs to be replaced if the motor doesn't restart when the tank is full.

Follow these steps to fix your issue:

  1. Shut off the electricity and drain the air tank

    The air compressor's power cord should be unplugged from the wall outlet. To drain the air from the tank, pull the ring on the safety valve.

  2. Remove the tank pressure gauge

    Remove the pressure gauge from the pressure switch.

  3. Remove the pressure switch tube

    The pressure switch tube fittings need to be removed. The pressure switch tube can be removed.

  4. Remove the pressure regulator assembly

    The pressure switch assembly needs to be removed.

  5. Remove the pressure switch

    The pressure switch cover needs to be removed Take a photo of the wires that connect to the pressure switch. There are two wires from the pressure switch. The pressure switch has 2 green wires. The strain reliefs on the power cords should be removed. Take the safety valve out of the pressureswitch. The assembly of the pressure switch is connected to the tank.

  6. Install the new pressure switch

    Attach thread-sealing tape to the tank pipe. The pressure switch needs to be screwed onto the tank pipe. Align the check valve tube fitting when you tighten the pressure switch. Thread-sealing tape can be applied to the safety valve. Attach the safety valve to the pressure switch. The pressure switch cover needs to be removed. Attach the wires to the new pressure switch using your digital photo as a reference. The strain relief should be inserted into the power cord. The pressure switch cover needs to be reinstalled.

  7. Reinstall the pressure regulator

    Use thread-sealing tape to connect the pipe threads. Attach the pressure regulator to the pressure switch and tighten the fitting with the tank gauge facing up.

  8. Reinstall the pressure switch tube

    The pressure switch tube and the check valve need to be connected. Make sure to tighten the fittings firmly.

  9. Reinstall the tank pressure gauge

    Attach the pressure gauge to the pressure switch.

  10. Restore power

    The compressor needs to be plugged into the electrical outlet.

  11. Shut off the electricity and drain the air tank

    The air compressor's power cord should be unplugged from the wall outlet. To drain the air from the tank, pull the ring on the safety valve.

  12. Disconnect the pressure switch tube

    Remove the pressure switch tube from the check valve.

  13. Disconnect the outlet pressure tube

    Remove the outlet tube from the check valve.

  14. Remove the check valve

    The check valve needs to be removed from the tank.

  15. Install the new check valve

    Attach the new check valve to the tank. Align the fitting and tighten the check valve.

  16. Reconnect the outlet tube

    The check valve has an outlet tube.

  17. Reconnect the pressure switch tube

    The check valve has a pressure switch tube.

  18. Restore power

    The compressor needs to be plugged back in.

Time required:

45 minutes.

You would need the following tools:

nut driver set, work gloves, wrench set.

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