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Electric Power & Utilities/Question (previously answered) about Sears grinder.

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Mark wrote at 2013-06-03 00:29:10
I did the same thing to my Craftsman 6" bench grinder (model 319.19062)and following the instructions given here I experienced the same results: It runs but has no power.  Being that I did completely disassemble the motor, I know that that is not necessary.  The problem is the original instructions.  They are helpful but inadequate.  

There are two windings in the motor and they are different sizes.  There are two red wires and two white wires going into the motor. One of the white and one of the red are joined to one end of the large winding.  Use a continuity tester to determine which ones.  Cap off that white one.  The red should be joined with the black from the capacitor to the power side of the switch.  The other white is connected only to the end of the small winding, it should be connected to the red wire from the capacitor. This provides power to both windings. The last red joins the other ends of both windings and should be attached to the common side of the switch.

The switch is a single throw, double pole type and should have a black and a white on the cord side.  The other side should have two black wires.  With the switch on, you can check for continuity to verify which black wire is the power and which is the common.  

I hooked mine up this way and it spun right up to full power.


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Charles C. Jones

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Let Me help you with your problems with single phase and three phase electric motors. I can tell you how to troubleshoot your motor problems. From simple testing of capacitors, how to test your windings, replacing bearings, and general maintenance. Before we go any further, remember these words of advice: Disconnect the power before you do anything! Please limit your questions to electric motors and there immediate components. I review each question, and if I can answer or help, then I will. If you receive a rejection, it means it is out of my expertise, and just do not have the answer. I'll be waiting for your question.

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I have 40 years experience in the repair of electric motors and related equipment. I am a master machinist in the field of motor repair. I was employed with my company for 35 years, but retired in May of 2013. The downside to that is I lost access to a lot of technical data. I will still try to give you the most accurate advice that I can.

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