Craftsman 6hp 30gal compressor will start then cut back off

Plug in the compressor. Flip the switch and the compressor starts up. Runs a few seconds and cuts off and will not start back up. Had motor capacitors checked and they are fine.


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Bill says...

Assuming that the pressure in the tank is below the normal cut in pressure level, then the symptoms suggest the pressure switch.

If you look at the end of the pressure switch, you may be able to see part of the innards. If you can, toggle the switch off and then back on with the power off. Drain the tank to zero. Plug the compressor back in and watch the switch.

If should immediately toggle on to send power to the motor as the pressure in the tank will be zero.

Continue watching as the tank fills. When the compressor stops, regardless of what pressure the tank is at, do you see the pressure switch move at all?

If you can't see any movement with the cover on, then take the cover off and watch. Be careful. There will be exposed live wires! Do not reach into the switch for any reason. Simply watch.

If the switch toggles off before the pressure in the tank reaches the normal cut out pressure level, then my guess is your switch is pooched!

Bill

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craftsman 5hp briggs and stratton gas powered belt driven air compressor stalls when pressure builds up

by john piper
(palm bay, fl, USA)



i have a craftsman 5hp briggs and stratton gas powered belt driven air compressor that quits/stalls running when the pressure builds up.

theres 2 valves that i can manually bleed the air from. one is fancy w/ some sort of diapham comeing into it before the valve w/ air supplied from the comp. and the other side of it goes to linkage on the motor which appears to adjusts the governer as needed. if i leave the leaver on top flipped/tripped were it leaks a little the motor will keep running fine and build up air but once i close it and the air press. gets high the motor instantly stops like its locked up or been turning off like an electric one. the other valve is just a typical high pressure blow off type located just before the hose connector. the motor runs great w/ good compression and the compressor builds up pressure quickly which is why im thinking its the fancy pressure regulator switch...any help will be greatly appreciated

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John, I don't have a gas driven compressor, so I hope that folks out there that do will comment and correct any mistakes I make.

It sounds to me as though your unloader, which is linked to the throttle, needs adjustment. When the air pressure in the tank reaches the normal cut out pressure level, instead of a pressure switch turning the motor off, as it does with an electrically driven compressor motor, it unloads the motor and throttles back on the fuel so the compressor motor slows down but keeps running.

When the pressure in the tank reaches the low pressure cut in, the pressure switch toggles the unloader which adjusts the throttle to increase the revs to speed up the motor, allowing it to handle the increased load as the pump starts pumping air into the tank.

I hope someone has a manual or a how-to to help you adjust this mechanism, John. I have not worked on them myself.

Cheers,

Bill

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GAS 5HP 20 Gallon Craftsmen Compressor with HVLP Automotive Spray Gun ??

by Michael
(Santa Clarita)


I want to purchase a compressor i can afford and i can use to paint my vehicle. I want to make an informed decision. I want to be able to run a small powerful compressor without running out of air while in the middle of spraying.

Here are a couple of spray guns and specs i found online. For the compressor I am intersted in. What do you think about this combo.


Gas CRAFTSMEN 5HP GAS BRIGGS AND STRATTON

20GAL 110 psi max 12cfm @ 40psi 10cfm@ 90psi

I want to purchase this compressor. But I want to know if it will handle a automotive spray gun without any proble,


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Such as these spray guns

Devilbiss Finishline FLG-654 HVLP Spray Paint Gun Requires 13 CFM @23 PSI inlet.

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3 Devilbiss HVLP SPRAY PAINT GUNS

* 30 psi inlet pressure delivers
* 10 psi air cap pressure at
* 13 cfm air volume
* Air inlet: 1/4" NPS

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Bill says...

Hi there. You need a compressor you can afford, but can you afford to buy one that won't work?

In my opinion (and it's just my opinion) the compressor specs show it to be just marginally suited to one of the guns.

If the compressor is working optimally, and the gun demand is as stated, it might work. But, on the other hand, when you read the specs for mileage on new cars, do you believe them?

I don't, they are theoretical, which means that you will get less mileage than promised.

So, when you read the specs of a compressor, can you believe that it will deliver exactly the flow and pressure promised? Maybe, maybe not. In your case, the compressor output is too close to the demand curve.

It were me, I'd want a bit more horsepower, and a larger tank if I were painting vehicles.

Cheers,

Bill

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