Question about Dewalt 2 Hp 4 GAL Air Compressor

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Have an emglo that will not start. Replaced the pressure switch with no result. Anything else to look for>?

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May have tripped the overload look for a reset button allot of them have the number 15 on the tip of the button try pushing it in and see if it starts or if it is buzzing when you try and turn it on it most likely is the capacitor

Posted on Oct 07, 2010

Testimonial: "Did try the reset switch to no avail - no buzz"

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1 Answer

My emglo airmate AM39HC4V compressor only hums when I turn it on. I've replaced the capacitor, but still does not start. The motor and compressor turn freely when disconnected from the pressure tank.


It sounds as though the start switch in the back of the motor housing is not functioning correctly. This is a device that when the motor is still and up to a certain RPM there are contacts that put the start cap in the circuit. After reaching operating RPM there are small weights that fly op[en pulling the contact apart. When the motor stops, the entire operation starts over.

My recommendation is to pull the back end off of the motor and look for a spring loaded mechanism that is attached to the rear end of the armature shaft. Check it for proper operation and ensure that the component are aligned correctly so that the contacts, which will be visible, are actually resting together when the motor is not operating. If all of this results in no operation then the motor has a shorted field winding. Time for a new motor.

Jul 02, 2017 | Air Tools & Compressors

1 Answer

Why wont the motor kick in and set off the reset button


The circuit breaker is to protect your compressor most times the its a problem by to less oil inside because of fall over during transport or operate with the powerplug instead of the pressure switch.
Than it has no pressure release and can not come to turned round
he needs to blow off by pressostat (pressure switch)before it can free start , BUT it can also happens that your capacitor is broken then there is no start direction and then there is also no start only humming sound

Jan 24, 2016 | Dewalt d55151 factory reconditioned emglo...

1 Answer

MK246: Is the 15 amp rocker switch a manual reset? My compressor started then stopped and can't restart.


if this ,Circuit Breaker
Part Number: 5134583-00 doesnt reset,it is under the cap,see pic,then,check pressure switch,
Pressure Switch
Part Number: 5130311-00SV

replace with this switch,the old switch is not made anymore,here is the parts list too


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22651766-s2334v25gcrexvzx51b1irkp-5-2.gif

Jan 03, 2014 | Dewalt D55155 Emglo Air Compressor

1 Answer

Relief value releases and will not reset


Likely the check valve is bad or has contamination on the seat. The result is the pressure will bleed back out the compression relief valve which is often as part of the pressure switch.

If the safety valve is the one that is bleeding, then the pressure is set too high at the pressure switch.

Apr 07, 2010 | Dewalt d55151 factory reconditioned emglo...

2 Answers

Hi I have a Dewalt d55141 emglo contiues to run


Open the shut off switch box and adjust the cut out pressure.

Nov 17, 2009 | Dewalt & 2HP Hand Carry Heavy Duty...

2 Answers

DeWalt emglo compressor does not start


hello,
well,you have to release the pressure,the cut out pressure at 120 psig.reached,and the cut in pressure maybe at 40 psig.so after realeasing pressure at cut in the compressor will run.if the compressor not run at cut in or after releasing check your power supply if still have,swicth off power breaker,by pass pressure switch,by disconnecting the line on terminals of pressure swtich,connect the line w/out pressure switch
the wire line should supply the the compressor,
open the service valve of compressor,switch on
observe if compressor run and develop pressure or air is coming out to nozzle,if that so switch off again and replace pressur switch.you have defective pressure switch,regards rate me,thanks

May 02, 2009 | Heating & Cooling

1 Answer

Air compressor does not regulate pressure to set point.


Emglo airmate compressors are set from the factory to shut off at around 125psi. There is an adjustment (remove cover to pressure switch) that will controll the cut-off pressure but it is not recommended changing the factory setting. There is also a safety valve installed that will open at about 160psi. It is a small brass device with a pull ring. When things go wrong with the pressure switch (rectangular box with power cord coming out of one side) the safety will pop open. There is a pressure regulator with round knob on panel that will lower the pressure to the tool, however this regulator does not control the pressure switch. Let you compressor run untill it shuts off and verify pressure to be about 125, if it is then all as well. Good Luck

Jan 03, 2009 | Dewalt d55151 factory reconditioned emglo...

3 Answers

Compressor will not shut off


The switch is bad, replace it, this should solve the problem.

Nov 17, 2008 | Dewalt d55151 factory reconditioned emglo...

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