Question about Craftsman Air Tools & Compressors

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I have a 3hp 20gal sears craftsman air compressor. that starts pumping, but when it gets up to 40pounds it blows a breaker and then the motor just hums when i start it back up. but if i disconect the belt the motor will run all day.

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Don't forget the off--loader. If the pressure on the head is not relieved, it will not be able to restart.

Posted on Apr 07, 2010

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Here is the trick, you have to figure out if there is something wrong with the pump or the motor, yes the motor may still run without the belt on it just fine, but there is also no load being applied either. if the pump seems to roll over ok by hand, I would have the motor checked out by a motor shop, could be that the start switch or capacitor is at fault. once the motor checks out thenlook into the pump.

Posted on Dec 09, 2009

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Hi dtsorrell...

If your somewhat of a mechanic/electrician then you can by-pass the pressure switch by hooking the color coded motor wires together with the incoming color coded wires from your power cord in the proper order.
Plug it in and then check to see if it blows the breaker again, if it does then it is your motor that is faulty.
Please take time to rate me.

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I have an 80 gal Craftsman air compressor who just shut down, the pressure is dropping, it made a smoke smell and it blew my circuit breaker. I tried starting my circuit breaker but it kept flipping off....


Usually related to the in-tank check valve. Follow the discharge hose from the pump to the tank. At the tank the hose attaches to a brass valve (or metal valve). This brass fitting is the check valve. It's purpose is to hold air in the tank and not allow the air to load the compressor when motor is trying to start. Easy to test. Use another compressor to pump air into your tank thru the quick disconnect or remove the safety valve and install hose there. Pump in about 75 psi and looks for leaks with soapy water. Remove air inlet hose from check valve and check for air leaks. If leaking, replace with generic valve available at www.grainger.com or order from sears parts. If no leaks then suspect unloader is not working at the pressure switch. If both the unloader and check valve is ok then test capacitor for reading within 95% of rated valve. Good holidays

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Manual for craftsman 3hp 20gal air compressor


http://www.searspartsdirect.com/partsdirect/index.action

Click that link and enter your model number. Once you do that there will be an orange button to the right of the screen that will say "View Manuals". There you will be able to download your manual and print it off.

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I have a Sears 33gal vertical compressor. About 8 years old. I keep tripping circuit breakers whenever the compressor is activated and starts to pump. Please advise


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1 Answer

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That number does not come up on Sears parts direct, how ever a start capacitor you can have tested at any motor repair shop and likely get one to replace it from them as well,,,and can almost guarantee it will be cheaper than from sears anyway.

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I would advise rebuilding both sides to get the pump back up to correct running levels it had new.

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1 Answer

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