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Air leaking around regulation knob - Campbell Hausfeld Fp209501

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I have a UST 2 hp 10 gal compressor. It builds up


The leak may be a result of over pressurization, it sounds to me as though the regulator needs to be replaced.

Sep 08, 2014 | Air Tools & Compressors

1 Answer

Compressor runs and sounds ok, but it only manages to show 20 lbs. It will not build air pressure and continues to run.


check air tank drain valve located on bottom of tank, if it is not leaking try adjusting air pres regulator (large black knob close to air hose connection.) the knob when turned in will increase the tank air pressure, if knob wont turn check that lock ring on bottom of knob to make sure it is disengaged. also check for air leaks in all lines and connections

Apr 16, 2012 | Craftsman 1 hp Air Compressor, 4 gal. -...

1 Answer

The regulator knob is broke. Where can I get a replacement? Replacement parts diagrams do not show the knob as replacement part.


You can't buy the regulator knob as a seperate part, you have to buy the entire manifold; Porter Cable part number N003001. Shop around on parts sites as these cost around $70 plus any shipping and handling. Depending on how often you have to change the regulated pressure output it may not be worth replacing.

Jan 20, 2011 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

Makita MAC5200 Compressor. Leaks air around the regulator screw in adjustable black knob only when I turn up the regulator pressure to allow air to flow through to the quick connects. I've taken the...


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

Sep 27, 2010 | Makita MAC5200 Electric Powered Air...

1 Answer

Porter Cable air compressor modle #CPE 6025 Leaks air from around gauge and pressure adjustment knob.


remove the pressure gauge, wind the thread with ptfe tape .and refit.regarding the pressure regulator, you have to change the parts

Sep 15, 2009 | Air Tools & Compressors

3 Answers

My knob assy (137-0001) keeps popping off and air leaks around the adjustment knob on the top of the assembly.


SOMETIMES YOU CAN TIGHTEN THE OUTSIDE OF THE REGULATOR UP A LITTLE. OR THE REGULATOR IS BAD. OR THE REGULATOR IS SEEING BACK-PRESSURE JUST AS IF IT WAS INSTALLED BACKWARDS. DO YOU HAVE IT CONNECTED TO ANOTHER COMPRESSOR DOWNSTREAM THAT COULD POSSIBLY BE A LITTLE HIGHER PRESSURE AND BLOWING BACK THRU THE REG. HOPE THIS HELPS, JODY

Aug 27, 2009 | Coleman Powermate 11 Gallon Air Compressor

1 Answer

Air compressor pressure not regulating


Usually you cannot adjust the cut out pressure of the tank/motor itself, this is why they have regulators, which regulates the pressure flowing down the air lines (regulators like these dont regulate actual tank pressure cutout). To regulate air flow using the regulator knob, you actually have to have air flowing through the hose while you make the regulator/pressure adjustments as regulators regulate pressure DOWNSTREAM from the actual regulator itself.. so air flowing through is a must. Attach an air blower or something similar and let air start flowing through the hose. Now turn your regulator knob in the "-" direction to decrease regulated pressure. It is best to bring pressure all the way down to "0" first, then open the regulator up (by turning to the "+" side) and pressure will rise until you get to the desired pressure needed for the air tool in use. The tank pressure will still be between 80-125 PSI as the motor regulates and keeps the pressure in the tank between these values automatically, but your line/hose air flow pressure will remain at the regulated pressure (say 40 PSI or whatever you set using the regulator knob).

Hope that helps and makes sense.

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Jun 18, 2009 | Makita Factory-Reconditioned 2.5 HP Air...

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