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Motor runs fine but there is no air pressure build up. What could be the problem with dewalt d 55270

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  • Air Tools & ... Master
  • 16,037 Answers

The intake valves on the head of the compressor are bad. They are not closing to allow compression.

Posted on May 05, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 3 Answers

SOURCE: Campbell Hausfeld compresser throwing breaker

There is a one way valve that only lets air from compressor to tank. If this isn't working the motor is trying to start under the pressure of the tank, and therefore tripping your breaker.

Posted on Nov 30, 2008

  • 65 Answers

SOURCE: coleman compressor no build up of pressure

your correct either the valves are worn or maybe just need cleaning as for the gaskets,idont know what part of the world your in but check out coleman on the internet or failing that ,i have maid these from gasket material suuplied from my local bearing supplier

Posted on Dec 03, 2008

mrhappyface
  • 205 Answers

SOURCE: air compressor fills, but slows down as the pressure builds

sounds like you need a new check valve which should be somewhere between the compressor outlet piping,tubing,etc and the tank which prevents the air in tank to back feed to the compressor which would cause hard starting and could damage the motor easy way to check is when you shut off the compressor with some air in the tank if the check valve is bad it would continue to bleed air out out the unloader valve .the unloader valve on your unit is most likely part of the pressure switch when the unit shuts of it should only bleed down the pressure in the pump so it would make it easy to start when needed hope i didn't confuse you

Posted on Mar 23, 2009

  • 1388 Answers

SOURCE: Dewalt 4 gal air compressor will not build pressure in take.

The bleed valve is an unloader of sorts that allows the compressor to start with-out a load. It closes when the pressure in the airline reaches about 20-25lbs with good volume. If air volume is not sufficient, the valve will not close. To solve the problem lets do a few tests. A long cord will reduce power and reduce air volume. Try powering the compressor with-out extension cord. If bleed valve closes when you do not use a cord, the compressor is not getting enough voltage, use shorter cord of the 12 gauge quality and more hose to reach work. If valve still does not close, check for air leaks on all fittings including around pressure switch and drain valve with soapy water. Repair as necessary and retest. If no leaks were found, temporarily plug bleed valve port with screw/bolt and run compressor till set pressure cut-off while counting minuites/seconds. The compressor should fill and shut off within three minutes or so. If it takes an unusually long time to fill, then the reed valves /valve plate is worn and leaking pressure back into cylinger. Leaking valves will usually result in very hot discharge airline/air. Reinstall the bleed valve after test. Parts and partslist are available at www.toolpartsdirect.com . Good luck on the repair and email if you have other questions.

Posted on May 06, 2009

  • 225 Answers

SOURCE: Pressure builds to 20 lbs- and wont go any higher and motor runs

sounds like the regulator is fualty.

Posted on Jul 30, 2009

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1 Answer

Dewalt Emglo 55168 motor starts to slow down as pressure builds to about 30 PSI. It really starts to labor. Any thoughts as to what could be causing the motor to strain and slow?


Most likely in tank check valve is leaking or belt is slipping. Belt tension easy to check, should not deflect with thumb pressure. Check valve should not let air escape out of tank. Easy to check. Run compressor till pressure builds to around 50 psi. Then unplug machine from power outlet. Listen for air leaking out of tank. In bad cases, air will actually leak out of intake filter. Replace check valve as needed. Good luck

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I have a dewalt 4200 pressure washer that will run for a few minutes and then randomly jus shut off..


Check the bottom of the gas tank for dirt/debris and the float bowl for the same, if it has a fuel filter check that also. Sometimes, if there is debris in any of these places it will settle down when the gas flow is stopped. Then, depending on how the machine is being used or moved around while it is running, the debris will slowly be pulled into the gas flow until it creats a blockage and starves the motor of fuel. When the motor dies the debris settles back down in the tank/float bowl and the motor will start again. Clean out anything in the tank and float bowl and replace the fuel filter if it has one.

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1 Answer

I have a model 55270 dewalt compressor,serial #20813 I'm looking for manual and age.It shows date 200449-49


The link below takes you to Dewalt parts/service section. Here you will find manual and parts. The dewalt service center will gladly tell you the date of mfg.. Just call them with model, type and serial#. Good luck with your compressor.



http://servicenet.dewalt.com/Products/Detail?productNumber=D55270

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1 Answer

Will not allow me to regulate air. compressor kicks on and builds to max pressure.


All air compressors build pressure in the tank(s) to their maximum allowed by the pressure switch. The regulator only controls the pressure of the air available at the outlet. That's why they have two pressure guages, one for tank pressure and one for outlet pressure. If you cannot control the air pressure at the outlet then you have a defective/broken regulator. Dewalt does not make the regulator as a seperate part for their air compressors, you have to buy the entire manifold which includes a regulator to fix this problem.

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My dewalt emglo air compressor has been pumping up and cutting off but can here air escaping in the inside and when it reaches cut-in the motor just hums loud and cuts off until I bleed all air and then it...


Sounds like the pressure relief valve......It works as a relief so when the motor comes on it is not under a load/pressure. Much eiser to start not under a strain.........

Dec 19, 2009 | Dewalt Air Tools & Compressors

1 Answer

Dewalt compressor builds pressure then pops off at max, never stops running


would best guess that the pressure switch is stuck shut. if the pressure is going over 125psi, "and check with a good gauge" then the switch needs to be replaced.

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I have a dewalt D55155 compressor that has not been used in three years. It starts and builds pressure, but does not charge the air hose. Ant thoughts?


have you turned up the regulator, the big black know by the output fitting

You may have to open andclose it a few times cuz it may have trash or be stuck

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1 Answer

Dewalt d55141 Builds only 45psi


Check the unloading valve. Accumulation of dirt might be preventing the valve to fully close, by-passing a portion of the compressed air.

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