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Air Compressor Stalling #5264575 11/11/19 08:57 PM
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spasm3 Offline OP
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I have a Kobalt single stage 60 gallon cast iron oil compressor. Couple of years old. I don't know if lowes even sells this model now.

It will run fine with no load. It will run fine till it hits 80psi, then it slows down until it tries to slip the belt. It should pump the tank to 150psi or so.

I don't know a lot about compressors. does this sound like something i can diagnose and repair?

Thanks.

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Re: Air Compressor Stalling [Re: spasm3] #5264580 11/11/19 09:04 PM
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When it slows down, does it seem like the compressor itself is slowing it down, or just the electric motor seems like it just cant handle the load?


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Re: Air Compressor Stalling [Re: spasm3] #5264583 11/11/19 09:08 PM
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Check the belt first.....It won't squeal like a V-belt on a vehicle. Glazing of the belt traction surface is pretty easy to spot.


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Re: Air Compressor Stalling [Re: spasm3] #5264603 11/11/19 09:32 PM
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spasm3 Offline OP
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It sounds like the electric motor is trying to turn the compressor to the point of slipping the belt. Almost like the compressor is seizing up. Its always at 80psi when it starts. The electric motor tries to keep turning the compressor until the belt squeels.

Its never been run low on oil and really has not been run that much.

Runs flawless to 80psi, but won't pump past that. The electic bogs down and it squeels right before it trips the breaker.

Last edited by spasm3; 11/11/19 09:52 PM.

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Re: Air Compressor Stalling [Re: spasm3] #5264626 11/11/19 10:05 PM
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Rand Offline
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Most likely some kind of issue with the motor. Bad bearing? bad winding/wiring etc.

Its 240v?


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Re: Air Compressor Stalling [Re: Rand] #5264636 11/11/19 10:23 PM
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spasm3 Offline OP
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Originally Posted by Rand
Most likely some kind of issue with the motor. Bad bearing? bad winding/wiring etc.

Its 240v?



Yes 240


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Re: Air Compressor Stalling [Re: spasm3] #5264655 11/11/19 11:29 PM
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Chris142 Offline
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Have you tried tightening the belt?


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Re: Air Compressor Stalling [Re: spasm3] #5264697 11/12/19 01:34 AM
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CDX825 Offline
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Had the same problem with a friends air compressor and it was the valves. We got a rebuild kit and for it with new valves and that solved the problem.


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Re: Air Compressor Stalling [Re: spasm3] #5264724 11/12/19 04:50 AM
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demarpaint Offline
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As mentioned I'd check the belt. Did it start doing this with the cold weather? I have that compressor and a small Craftsman belt driven compressor that gave me a similar problem in cold weather. Believe it or not I changed that machine over to a synthetic compressor oil and haven't had the problem since.


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Re: Air Compressor Stalling [Re: spasm3] #5264767 11/12/19 07:02 AM
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Donald Offline
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Check belt. There are still places that rebuild electric motors and would probably check yours at no cost? If its the compressor itself then there maybe rebuild kits available, or a new compressor. Kobalt did not make the unit but had a company put it together with available parts.

You almost certainly have a good tank and either a good motor or compressor.

Stop by your local indy shop, ask them who services their compressor and ask that company for advice.


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Re: Air Compressor Stalling [Re: spasm3] #5264771 11/12/19 07:03 AM
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zzyzzx Offline
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Are you sure that you have a good electrical connection? For all I know, you are only getting one leg on your 240V circuit. Unlikely, but really easy to check.

Re: Air Compressor Stalling [Re: demarpaint] #5264801 11/12/19 07:48 AM
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Originally Posted by demarpaint
As mentioned I'd check the belt. Did it start doing this with the cold weather? I have that compressor and a small Craftsman belt driven compressor that gave me a similar problem in cold weather. Believe it or not I changed that machine over to a synthetic compressor oil and haven't had the problem since.


+1 on using synthetic oil in your compressor. The past two weeks as the temperature dipped down my compressor runs slower for the first 5 minutes then by the time it warms up it's running normally. Even if Lowe's no longer sells that model, most Air compressors have the same basic design.


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Re: Air Compressor Stalling [Re: spasm3] #5264877 11/12/19 09:52 AM
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Fitter30 Offline
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If you remove the air fi!ter and block the intake for a few seconds this will unload the compressor and then if it starts knocking it could be a mechanical issue.

Re: Air Compressor Stalling [Re: spasm3] #5264883 11/12/19 09:59 AM
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Check/Replace the motor run capacitor. This is something that will cause this kind of problem and a part that commonly fails (because most of them are low quality Chinese parts now days) .

Re: Air Compressor Stalling [Re: spasm3] #5264967 11/12/19 11:49 AM
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Replace motor run capacitor first if it has one. Most, but not all 150 PSI compressors are 2 stage. One big lower pressure piston and one smaller high pressure. If the high pressure one has a valve problem, then the big one is attempting to pump up to 150, and it is too big and too much work. This compressor may be reed valve, and it is not uncommon for a discharge reed valve to break. easy fix. If it is disk valve, they sometimes get some rust and seize in the bore. Either way off with the head. New gaskets are recommended.

Rod

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