Question about Makita Air Tools & Compressors
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Posted on Jan 02, 2017
I have worked on many makita compressors and have run-across this problem on a few of them. Your compressor has a check valve that is supposed to hold tank pressure after the switch reaches set pressure. There is an unloader valve built into the pressure switch that releases the pressure in the discharge hose after the unit shuts off. The unloader allows the compressor to restart with-out any pressure in the discharge line. If the brass check valve is leaking pressure back into the system, air will leak out of the unloader valve. Follow the discharge line to the tank and you will see the brass check valve. To test valve for fault, run the compressor till it builds around 80 psi and unplug the unit from the wall outlet. Remove the 1/4" hose connector from the check valve and check for air leaking out of the valve. If it is leaking you can order form www.toolpartsdirect.com. or call the makita 1-800 number. The price is about the same. Good Luck on your repair.
Posted on Mar 19, 2009
SOURCE: Makita MAC5200 Compressor. Leaks
There are two types of regulators used. One has a rubber diaphram sealed at perimeter with body and a piston type. Most likely you have the piston type. Remove body containing piston/ spring mech. Examine piston lip seal. Lip will face toward body of reg. and must fit snugly into cylinder. Make sure cylinder is smooth and is well lubed.
If seal/piston fits loose remove seal and wrap some teflon tape in groove and re-install lip seal /test for snug fit. Notice small metal actuator extending from center of reg. , if it is circular (about 1/8 dia) then there should be an oring of the same size mated/fit into the piston. If this oring is missing it will leak as you describe. Lastly, there should be a gasket or oring sealing outer shell to body. If you have diaphragm type look for holes, tear or shrink too small. Parts are at www.toolpartsdirect.com or Lowes in the plumbing department good place for orings and silicone lube. Good luck
Posted on Sep 28, 2010
Makita has used several types of gauges over the years and all had removable lens/glass held on by screw or threaded lens. Most simple repair would be to purchase gauge and just swap out glass/lens. Order from www.toolpartsdirect.com. Good luck
Posted on Jan 12, 2011
Testimonial: "That helps, thanks!"
SOURCE: On my Makita air compressor
That is the unloader valve and it supposed to release a little bit of air when it stops. That takes the pressure off of the pump which enables it to restart easier.
Posted on Sep 09, 2011
Mobil 1 30 is what Campbell Hausfeld recommends. I have been using it for years. Their are many additives that make up a varied range of applications, so be sure to avoid them by using a good grade of non-detergent oil if you must use anything other than compressor oil or a synthetic. Some places to find compressor oil are K-mart / Sears,Harbor Freight and Home Depot / Lowe's
Posted on Sep 23, 2011
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