Honda motor stalls after filling tanks to about 60 pounds of air

by Ned
(Phoenix Arizona)

When I start my compressor, the honda motor runs great until the tanks get to about 60 pounds. Thats when the motor begins to strain and then finally quit altogether. Can you please provide me with direction? Thank you, ned


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Bill says...

Ned, when a gas compressor runs, and the air in the tank reaches cut out, the controls usually "unload" the engine to allow it to rev down until pressure in the tank drops to cut in, and the controls rev the engine up again.

If you have a mechanical issue back loading the motor to the point where, at 60 PSI in the tank, the motor stalls, then you need to identify where the overload is coming from. Plugged check valve going into the tank, maybe? Pump itself overheating and starting to seize?

Or, it could simply be a maladjustment of the unload / throttle controls.

Have a look at these issues. Comment here with more info if you want to dive in deeper.

Cheers,

Bill

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Emglo model AM78HC4 humms, won't run. (overheat?)

by Travis

Emglo hot dog style air compressor

Emglo hot dog style air compressor

I have a Emglo model AM78HC4 compressor. In the winter it is sluggish to start after sitting in the cold garage. To solve this I usually bring it into the house for an hour or so or shoot it with a hair dryer for a minute. After this is starts and runs no problem.

Recently I brought it inside and set up a hair dryer pointing at the motor from about a foot away. I answered the phone rang and the hair dryer ended up being on for about 5 minutes.

I took it to the garage and it started great but only ran for about a minute.

Now it won't start and just has a humming sound for a few seconds until the reset button pops. Did I overheat it with the hair dryer and what can I do now? Thanks.
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Travis, it is possible you overheated it, and I cannot tell from your post at what the heater was pointed.

So, a humming motor suggests a power issue. If nothing else has changed in how you use your Emglo, and if the unloader works when the compressor reaches cut out (hard to check when it won't run, I know) then if this were mine, I'd be checking the start capacitor.

Cheers,

Bill

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Apr 12, 2013
Head Gasket Leak?
by: Raymond

Emglo AM78HC4V compressor is blowing air from the head area. Would this indicate a gasket problem?
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Possibly. It would help if you could be more specific as to where the air is exiting the pump.

B.

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emglo air mate motor sits and hums?

I have a emglo air mate....it loads up to 118 but when used and falls to cut in pressure it tries to start but the motor wont rotate.....if I give it a spin it rotates.....
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Two things come to mind.

Empty the tank, close the drain, start the compressor and let it come up to cut out pressure. Monitor the unloader valve and make sure that it works.

Did it?

Post a comment here with your findings. If the unloader doesn't work that likely is your problem.

If it does work OK, and you are not using an extension cord on the compressor, and this just started - make sure the intake filter is clean, and then check your start cap.

Bill

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Dec 10, 2012
cap...vs....cap
by: Gene

when you read the cap its 53-65 mfd @330 volts even though my comp is 120volts....the cap stores then releases the xtra volts to spin the motor am I correct????....same as other motors....thanks
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Gene, consider the start cap as a quick-discharge battery that does exactly what you say, fires extra power into the motor to get it going. The motor inrush typically exceeds the capacity of a standard circuit, so without the start cap, your motor likely won't start and in trying, may actually pull too much power and pop breakers.

B.

Dec 10, 2012
emglo air mate
by: Gene

Did not use an xtension.......put another cap on and same thing ....started smoking and then it popped.....took everything apart....cant see any problems.....I am thinking something with the windings causing an overload....I am going to buy a new compressor..........thanks again Bill....Gene
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Yeah, it sounds like a motor issue now Gene. And, rebuilding the motor may cost as much as a new compressors.

If you do buy a new one, keep the old one for spare parts if it is a similar make and model.

Good luck.

B.

Dec 08, 2012
bill thank you
by: gene

the unloader was the problem.....pin was to short to engage.....put in new pin.....worked fine and then the cap started smoking......changed it snd same thing......I guess its time for a new motor or new comp.........thanks again.....gene
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You are welcome, Gene.

The cap is smoking as it's getting too hot, I suspect. Did you change anything about the power supply? Not using an extension cord, I hope?

B.

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sieze up compressor

Gas power , starts runs, untill warm, gets hot, compressor seams to sieze up?

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Bill says....

How long does it run before it "seizes" up?

What is the air temperature when you are using it?

What pressure is in the tank when it seems to seize?

Have you made sure that there is oil in the sump?

What is getting warm, the gas motor or the pump, or both?

It would be useful if you could give me your answer(s) as a comment here, so that I can follow our discussion as we try to figure out what is happening (or not happening) with your air compressor.

Cheers,

Bill

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Aug 14, 2011
answer to your questions
by: richard benjamin

answer to your questions
1)pump never has stopped running ,pumps hard ,belts slip
2)upper 80's lower 90's
3) yes there is oil in sump
4) pump is the issue

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Then it sounds to me as though you....

1) have an intake valve issue
2) gasket leaking or failure
3) motor is running to overheat and seizing temperatures increasing load on system

A compressor that runs and doesn't gain pressure past a certain point often has an intake or compression valve leakage, or an internal gasket failure allowing air to cycle back and forth from low to high pressure sides, without getting driven into the tank.


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