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I have a sears Craftsman 5hp air compressor with 20 gallon tank. It runs for a while and then will slow down and stop. It won't run again for quite a while. Not sure if it's overheating or if it thinks it's over heating. Can anyone help? Thanks, Brian

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  • Brian Lester Aug 20, 2010

    Hi Clay and thanks for your response.

    I believe my compressor is not the oil type. Any suggestions in this case?

    Thanks again.

    Brian

  • Brian Lester Aug 21, 2010

    Hi again.
    Model # 919.165250
    I went to sears website to look at a parts list but when I punched in this model # , it came back with model # not recognized. The label on the compressor is clear with that #.
    I am going out of town until Monday afternoon, so if I don't respond until then, you'll know why.
    I checked the little air filter and it looked clean.
    Thank again for your help.
    Brian


  • Brian Lester Aug 21, 2010

    Thanks Mike.
    I get it.
    Unit is electric. No extension cord. I think I have it set to stop at 80 to 100 lbs
    It stops when it gets to that pressure. But when I demand more the motor will eventually slow down and hum and if I don't turn it off, I'm sure it will blow a breaker.
    I will be out of town the the next few days.
    Thanks for your help.
    Brian

  • Brian Lester Aug 21, 2010

    Thanks Clay.
    It definitely builds pressure ok for a while and shuts off when it reaches my set pressure level.
    It's just that if I keep running it for very long it will slow down and hum and then I shut it off.
    Thanks again.
    Brian

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Hi There,

I'm going to need more info. First I'll give you a couple of things to try. If they work, great. If not. we'll see about getting me some detail (listed below). If you can't supply the detail, I'll pass on attempting to answer.

My first question would have been Gas or electric? I'm going to assume electric..

Is there an extension cord between the compressor and the wall?

Does it get warm to the touch? If yes, try a thicker (lower gauge) or shorter one.

Does it blow fuses/trip breakers?

Try running it on a different circuit.

When was the last time you drained the storage tank of water?
Ever? Is the unit 'Very Heavy'?

Release the pressure first. There should be some heavy bolt on the underside. Double check the pressure is zero. Open and empty the water. Plug the hole.

Run it. when it starts to bog, note the pressure, listen close to the motor. When it stops spinning, is there a click or a continued hum?

Before it starts again, is there another click?
If so, that's it overload / over heat resetting itself

I hope something above works for you, that way you can avoid the waves of additional info necessary.

Off the top.

Does the motor have a reset switch?
Is it the original motor?
Model ?

Units normal maximum pressure, the point at which it should turn off.

Units minimum pressure, the engine will start at this point or lower.

The point at which it currently bogs down and stalls.

Details.

Often, a problem can be the result of a seemingly unrelated event. It is always a good idea to include a recent history.

Additional information such as what steps have already been taken, has the product ever worked, is it new, etc. can have a bearing on providing the best solution for your particular circumstances.

Remember, you are a key participant in this process. We are not there, you are. We depend on you to be our eyes and ears. We can only respond to what you provide us. Without you, all our talent is worthless. How's that for an ego build?

What you get out of the experience depends on what you put in to it. So help us help you.

Posted on Aug 21, 2010

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Sounds like the thermal breaker is tripping on the motor. If it is an oil lube compressor then change the oil in the compressor. Be sure and use exactly the correct weight an viscosity oil as listed in your owner's manual and do not overfill it, which can be as bad as under-filling. It may or may not use non-detergnet oil so be sure. I would recommend synthetic oil. Release all air from the tank and drain it to remove any moisture. Clean all dust and debris from the compressor cooling fins. Use the air hose to blow all dust from the electric motor. Also do not use an extension cord with this compressor as it will cause the motor to overheat. Also make sure the circuit the compressor is using is not overloaded.

Posted on Aug 20, 2010

  • NOT ME Aug 21, 2010

    Hey Brian, What Model is your Craftsman air compressor? I need to look at the specifications on the unit. I forgot to mention that you need to check the inlet air filter and make sure it is clean oilless or oil filled. A dirty filter will cause either one to overheat. Once I know the model you have I may be able to help more.

  • NOT ME Aug 21, 2010

    A few things. First off you indeed have an oilless compressor. Is it building pressure. If not then it will continue to run until it overheats. If it is not building pressure then the Pressure Switch, compression rings (2), or head gasket is bad. Not the Pressure Regulator but the Pressure Switch. If you notice it leaking air at the unloader then the pressure switch is definitely defective. If it builds pressure then these are not the problem. Look at the fan and make sure no fan blades are missing and the cooling fan is working properly. Remove the cover and clean it up and make sure all is well. On this link you will find a diagram of your unit and a parts breakdown.
    http://www.mastertoolrepair.com/sears-cr...
    Another possibility is the motor is having problems. Turn on a light that is on the same electrical circuit as the compressor. Now turn on the compressor and watch that light. If you see the light dim then the motor is working very hard. It can be the start capacitor in the motor or the windings which would require the motor to be replaced. If it is just the start capacitor then replacing that will solve the problem. And lastly if you have too big a load on this circuit as in a refrigerator in your garage running on the same circuit at the same time as the compressor it will cause problems as the circuit will be not necessarily be overloaded but be creating a situation where the circuit is maxed out. This is all I can think of that will cause what you describe.

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