Question about Dewalt d55151 factory reconditioned emglo heavy - duty 2.5hp 4 gallon Electric hand carry compressor

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5.5 honda gas emglo Starts right up. pressers up motor idle down kicks in but Unloads at compressor don't and it kills engine . it is getting air to the head. no carbon build up .??

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1388 Answers

SOURCE: Manual for Emglo Air Mate Compressor

Manual for the similar dewalt model is at, click on parts & service icon, then enter D55151. Or try clicking here:,D55152,Elec.pdf This Dewalt compressor is one of many versions of the Old Emglo AM78 compressor. There are several other brands built with the exact same design such as the Senco line. For parts list of actual Am78hc4v go to If you have questions or problems with this compressor please email, Good luck

Posted on Jan 28, 2009

  • 1 Answer

SOURCE: emglo compressor starts but stalls quickly after

take off bowl to carb and poke a needle through center of carb where the threaded brass piece is plus clean sediment cup.make sure all other maint items are ok

Posted on Mar 29, 2009

  • 12 Answers

SOURCE: emglo airmate AM78HC4V; when trying to start

I had the same problem. Replace the motor capacitor. small white cilinder part with two wire plugs conected to it. This will have a single bolt holding it to the frame casing, you will find it under the black plastic shroud that covers the motor. Take it into any electrical or compressor shop and they will check it for you. costs about $35.00.

Posted on Jul 07, 2009

  • 169 Answers

SOURCE: won't build up pressure

Once it seized up, it damaged parts inside! simply breaking it free is by no means a proper fix and will likely not last anyway! the pump should be rebuilt and damaged or worn out parts replaced. If the crank shaft and connecting rods are damaged "and I'll bet they are" the cost to rebuild the pump will no doubt be as much or more than the cost of a new pump! I do not want to sound negative but just trying to save you time and money!

Posted on Dec 01, 2009

  • 1388 Answers

SOURCE: It is an electric motor Dewalt Emglo Compressor

Dewalt recommends using synthetic pump oil, however if you only use the machine occasionally and not in a commercial setting, standard compressor oil will work great and save you money. Synthetic oil will last longer and can take much higher temperatures without breaking down. Lowes sell the kobalt brand of compressor oil and sells for about $3 for standard and $7 for synthetic. Home depot sells campbell hausfeld brand but equally as good. Auto parts stores also sell a line of compressor /pump oil just watch pricing for your needs. If you can't find compressor oil, non-detergent motor oil works just fine. Good holidays

Posted on Dec 15, 2010

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When max pressure reached engine dies instead of idle down

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I have an Emglo compressor which firers up without hesitation when plugged in and turned on. However, the next time the compressor kicks in it just hums and trips the breaker in the fuse box. When I...

If the in-tank check valve is leaking air back into discharge line from the pump, the motor will not have enough power to overcome headpressure. Easy test with some air in the tank. Remove the discharge hose at the brass check valve at tank. Spray soapy water on valve to test for leak. If leaking remove the valve and clean the seat or replace as needed (drain air from tank before you remove the valve). If no leak at the valve, test the capacitor(should read to within 95% of mfd rating). Good luck

Oct 02, 2011 | Dewalt d55151 factory reconditioned emglo...

1 Answer

I need a diagram showing how the kick down cable (high idle cable) connects to the engine.

The link below shows typical connections for the idle control.
The pilot valve air discharge muffler should be cleaned of carbon deposits for the idle to work or pressure will continue to build. The idle control actuator piston has an oring that may need to be lubed or replaced. The actuator should not leak air when activated. Good luck

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I have a dewalt emglo electric compressor around 6 months old with only 5hrs of use. i find as soon as the temp drops a few degrees like early morning summer weather it will not start it will turn over...

I have a gas engine powered DeWalt compressor. I don't know about yours, but is there an unloader that you have to switch when you are starting?
Next, did you inform DeWalt, this unit is almost new(ly rebuilt) and they should take some responsibility for it.
You know, it could be that the motor has a starting problem, (bad capacitor, bad start winding system).

Feb 11, 2011 | Dewalt d55151 factory reconditioned emglo...

1 Answer

Dewalt /Emglo 10 gal ,150 psi with 5.5 Honda GSX just shuts off sometimes ,some days it works fine ,some days it wouldnt work at all ,looks like something with gas ,it would shut off after pumpin tank...

I have an Emglo compressor with a 8 HP Honda motor. The motor has a low oil level shut-off switch in the crankcase. My switch failed intermittently and the motor would run sometimes and not others. There is a wire going directly into the motor crankcase. On my unit, the switch is normally open and when there is enough oil in the motor, it closes to allow the engine to run. If you can't start the motor, unplug the wire that goes into the engine from the connector. Then stick a wire into that connector and hold it to metal on the engine & try to start the motor. If that switch is the culprit, it should now start.
Be advised that running the motor without the switch in the circuit would allow the motor to be run with no oil in it.

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1 Answer


try to decrease regulator, maybe you ask to much power and it shuts of. specially with cold motor its important to ask less pressure.

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the pilot valve or control valve when it unloads sends a air signal to close the motor throttle down to idle and depending on what form of control it uses for the compressor it will either use head unloaders to hold open the inlet valves or a unloader that dumps the compressor output to atmosphere, this one uses a silencer mounted near the pilot valve. if it uses this type remove the silencer and retest the operation. either you have a motor that is out of adjustment or the compressor is not unloading!

Jan 24, 2010 | Air Tools & Compressors

1 Answer

My 98 honda civic lx (automatic) idles high around 2000rpm when the engine is cold and when is hot idle goes up and down. I recently changed distributor, distributor cap and rotor. No engine light. When...

with your a/c issue, the compressor might be faulty and not engaging and disengaging. have the a/c system level checked and recharged if necessary...if okay, then start to check the clutch in the compressor to see if it kicking it or not...maybe the low side or high side for your idle, it really didn't sound like a distributor, me it sounds like you have a faulty, Idle Air Control Motor in the throttle body allowing in too little air, and when a/c is on, its just right...have them both checked,

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1 Answer

Compressor won't kick back on when its suppose too

The tank check valve is probably bad. Folow the large discharge line off the head, disconnecting one end of it. If you get air out of the line you have a bad check valve. If you don't get air you are probably looking at a valve job.

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1 Answer

Starting problem/turning self off

Follow the copper airline that leads from the compressor to the tank and you will find the pilot valve. This brass valve controls the pressure setting and also controls the engine. There is a small flip lever on top of the pilot valve that unloads the compressor for easy starting when there is pressure in the tank. Raise the lever straight up for start and lay to side for normal run cycle. When the compressor fills tank to set level, the pilot valve pops and idles the engine. If engine stalls raise idle by turning the idle screw clockwise at the carb. The arm that you see under the tank is the governor control arm. To increase the engine speed when pumping turn speed control screw counter clockwise. Sometimes the throtle control cable must be adjusted by loosening the clamp that holds the cable (black cable) at the engine and pulling the cable back away from the clamp and re-clamp. Hope this helps, good luck.

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