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I have a Lefoo LF10-4h Pressure swith that I can't assemble (from and air compressor). Can you help with a diagram or anything?

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Posted on Jan 02, 2017

  • 54 Answers

SOURCE: When my compressor cuts out, it starts losing air

The air is probably coming through the unloader on the pressure switch. This is designed to vent the pressure between the compressor pump and the tank so that the compressor starts easier. This venting should only take a few seconds (5 to 10). If it bleeds air continuously, until the compressor restarts, then the tank check valve is bad. This is usually a fitting that extends into the tank. The small tube to the unloader usually goes directly from the pressure control switch to the tank check. Depressurize the tank, remove the check valve, and try to clean it. If that doesn't work, replace it.

Posted on Dec 29, 2009

Testimonial: "I cleaned the check valve and it's working like new. Thanks a lot!"

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I want you to unplug the the plug that plugs into the compressor . Just in case there is a possible short somewhere, clip the wire's to the plug, but leave enough wire to reconnect them back . Attach two pieces of wire to the wire's on the plug that you just clipped, making them long enough to reach the battery . Plug the plug back into the compressor . After skinning the wire's on the other end, touch one to the positive (+) side of the battery, and the other to the negative (-) side of the battery . When you do this, you should hear a click from the clutch of the compressor, if you don't then the clutch is bad, if you do; then you are low on freon, your low pressor swith is bad, or you have wiring problem's .

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The air is probably coming through the unloader on the pressure switch. This is designed to vent the pressure between the compressor pump and the tank so that the compressor starts easier. This venting should only take a few seconds (5 to 10). If it bleeds air continuously, until the compressor restarts, then the tank check valve is bad. This is usually a fitting that extends into the tank. The small tube to the unloader usually goes directly from the pressure control switch to the tank check. Depressurize the tank, remove the check valve, and try to clean it. If that doesn't work, replace it.

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