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If your mixer's motor was built by Hobart; there are thermsiters built in to the stator's windings that can cause this problem. Check the amp draw while it is running. Also if your are over loading the mixer or using the wrong speed,, that will cause an over heating problem. You should be able to get on the ITW Food Equipment Group / Hobart web site(s) and get capacity chart.
Most motors of that type have a capacitor that puts the stator out of phase with the rotor. They are capacitor start induction run motors. These also have a centrifugal switch inside near the end ot the shaft to put power to the start winding for a split second to determine the direction of turn and to increase horsepower until it is up to speed. So if it fails to start either the centrifugal switch needs cleaning (or replacement if damaged) or the capacitor needs replacing to give it its original power, or the start winding has failed from overheating. There may be a thermal cutout on the start winding that may need to be replaced if it did overheat. If the start winding burned then the motor would require rewinding or replacement.
Check manually after disconnecting the motor if this is jammed. If so the motor must be reset as the bearings are faulty and so the rotor seems to get stuck with the coil core. Also if there is high drain with heat it is possible that the coils are faulty and might need an insulation failure test.
My fantastic guy just rebuilt my A200. He says it's likely that your back plate is slightly off center so that the center arbor is touching the windings-- any contact and the machine won't run. The tolerances are thousandths of an inch in there.
Hi Dan. Two options. The first is to call Hobart and ask about a temporary replacement mixer while your original motor is being rebuilt. They'll charge you for it, if they will do it at all. If Hobart is doing the rebuilding, they might give you a better price or a free loaner.
Second. eBay often lists hobart motors for sale, you might get lucky and find one quickly. Since you absolutely must have a working mixer for your business, you might consider having a spare motor on hand for just such an occaision.
If this solution has assisted you, please rate it. Good luck! ricardok45