8 hp gas wheelbarrell emglo 70 psi up it starts to squeal

by casey
(waxhaw nc.)

my 8 hp gas compressor cranks runs but when it get around 70 psi up it starts to squeal belts smell like they are burning and pulley seems like its trying to stop is it the bearing inside


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Bill says...

Casey, it sure sounds like your compressor is reacting to the pressure build up in the tank, and this load is causing the problem some how.

Yup, it could be a bearing, but I'd check a couple of other things before zeroing in on that.

First thing to check is, of course, is pulley alignment, followed by belt tension. I am going to assume that this is OK.

Next, is there good oil level?

What about the intake filter. Is it clean and can air pass through it easily?

Next thing I would do is dump all the air, and pull out the check valve to make sure that it's clear and working properly.

If the pump pulley is slowing, the alignment and tension are correct, and the belt is squealing and burning on it, the pump pulley is reacting to increasing load. Make sure it is neither of these two first.

Could also be an intake valve or pressure valve in the pump head that is failing under pressure.

Then, I would look at the bearing I guess. What is it you use to test bearings, Fast Fourier Transfer test of some kind? Checking the sound frequencies or vibration or something along those lines?

You might find the bearing changeout lower cost and easier to do than tearing down the pump, so maybe that's what you do after the other checks.

Cheers,

Bill



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L3B-60 runs slow with belts on, seemingly normal without belts

by RonW
(Akron, OHIO)

This is an Emglo L3B-60 twin cylinder, 3HP, 230V wired 60 gallon compressor that I inherited.

I have tested the electrical feed and get 230-ish volts. I turn on the power and the unit starts but runs very slow. I have not let it continue to run to see if it builds pressure.

The tank should have zero pressure because it has been several months of no use. I removed the belts and again turned on the power and it seems to start normal and run seemingly normal.

Oil is clean and at proper level.

I removed one of the cylinder heads to check for binding, improper action, all looks good.

Have not removed other head cover.

One piece of history, the unit was left on overnight and the hose end ruptured causing it to run all night.

The unit was obviously hot but still running.

The oil was changed between then and now and the unit has been used since that time (last fall).
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Excellent diagnostic work on your part Ron. Thank you for a complete post.

Just to clear it as a possible cause, remove the intake filter and start the compressor. If the symptoms don't abate, then it won't be a plugged intake filter.

I, too, doubt there is air in the tank, but you want to open the drain anyway to get any condensate that's been sitting in there out of the tank.

It is possible that the overheating warped or damaged the intake or pressure valves. That I cannot check from here.

What you can check, see the page on this site, is the start capacitor. A failing start cap could create the symptoms you describe.

Cheers,

Bill

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Emglo KU - trying to remove the flywheel pulley

by Bryan Williams
(Castaic .C.A)

front veiw

front veiw

i have an Emglo compressor pump and trying to remove the flywheel pulley, there's no set screw and it appears to have a rivet or a pin facing outwards . how do you remove the pulley? any info would be greatly appreciated . thanks

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emglo gas powered compressor doesn't speed up when it pumps up

by Andy.
(MN)

My emglo gas powered air compressor used to speed up to build up pressure. Now it just stays at idle and barely has enough power to build up. Its not the engine, it runs great and if I manually push the little valve on the throttle it speeds right up and works fine. Its like it doesn't relieve the pressure off of the valve that speeds up the engine.

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Bill says...

Andy, you've already determined what the problem is. Your pressure sensor is not telling the throttle to change as the pressure in the tank alternatively calls for pressure, or tells the pressure switch that there is enough pressure.

So, it's the signal from the pressure switch circuit or the throttle valve circuit, or a bit of both.

Cheers,

Bill

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