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In case you have to replace the pressure switch, or the pressure regulator is leaking
I bought this compressor in 2006 and it is still going strong. I highly recommend it. BUT, I have had to replace the pressure switch on it twice. I am adding this review to advise other users that, if you need a new pressure switch, you do not have to buy the Makita branded switch. Makita does not make the switch. The switch that came with my compressor is actually a Lefoo Air Compressor Pressure Switch Control, 95-125 PSI, 4 Port w/ Unloader LF10-4H-1-NPT1/4-95-125 that has been adjusted for higher cut-in/cut-out pressure. You can find this for sale on Amazon for less than half the price of a Makita switch. The only difference is that the Makita switch comes with a cut-out pressure of 135 psi. The Lefoo switch is factory set for 125 psi cut-out. If you like the 125 psi cut-out, you don't have to do anything. If you prefer the higher cut-out, all you have to do is turn the left adjusting screw clockwise until, by trial and error, the cut-out pressure you want is achieved. Note: this will also raise the cut-in pressure. You can also replace the Makita switch with a Sunny SP-204, L4, 4-port, 95-125 psi. Like the Lefoo switch, it comes factory set to 125 psi cut-out, but you can raise it the same way as the Lefoo switch. BTW, I found that to remove the old switch and install the new, you have to take off the switch cover and also take out the 4 allen head screws that hold the shroud on and move the shroud back a bit, otherwise the switch body will hit the shroud. Note what ports the pressure gauge, air outlet and plug are connected to on the old switch and swap them into the same location on the new switch.
One other tip. If air starts coming out from under the adjusting knob of the pressure regulator, it does not necessarily mean that you need a new regulator. It may just have gotten dirty. If you are handy, it is a fairly easy matter to take the regulator apart and clean it. Just be sure to pay attention to how the various parts go together. Clean everything, lightly lubricate all of the o-rings with silicon paste.and reassemble. There is a good write-up on doing this here. (It's for the MAC5200, but the pressure regulator is the same):
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Hope this helps save you some money.
October 2016 · Tools and Home Improvement · verified purchase