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It is humming because the Start/Run capacitor on the motor has failed. Call for service, tell them it is on but humming and they will bring one and fit it.
If the gearing is all free to move and you replaced the motor capacitor that only leaves the motor. If you can remove the motor and test it "out of the gearing" that would confirm it. You have wired the capacitor correctly and used the correct one? Just asking! Are you sure the gearing isn't jammed up?
The first vertical shaft has a brass gear that runs off the rotor. The ancient models had a spring loaded slip clutch built onto the gear. Upgrade it with a worm shaft kit which gives you a complete new shaft and fixed gears. I think it includes the upper and lower bearings. Maybe replace the grease if it has not been done. Or look for a sheared key on the worm shaft.
Assuming the unit is 120v, single phase, my money is on a bad electronic start switch (not to be confused with the on/off switch) It's not visible without some disassembly. Usually, it is located at the rear of the motor cavity. Take note of all the info on your model data plate then go here to obtain a parts breakdown on your particular mixer. http://www.hobartservice.com/Parts/
take top front cover off see if motor is spinning when turned on? hum can come when motor is running or transmision jammed or motor has issue like capsitor bad or start switch inside motor bad.
Hi, it is hard to determine exactly what the problem is without seeing it, however, that mixer usually uses a capacitor to help start the motor, and a switch, or relay, that are in the back of the unit. You probably will not find any troubleshooting guide, Hobart does not give up information easily. You can take it to an electric motor repair shop, and they will easily be able to tell which of those is the problem, and will be reasonable in price. Your other option is to contact Hobart locally for service assistance. Maybe one of the other Hobart techs here can help you out more.
Hi,im a hobart tech and know all these mixers well.What kind of mixer are you looking to write about?The differences are the sizes of bowls as 20qt,30qt,40qt,60,qt,80qt,140qt.Pick a mixer and i will write YOUR paper,but i want a fixya rating in return.
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