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call in an electrician as it may be the start/run capacitor for the motor ( indicated by motor humming but not running)
the gearing will make it very difficult to turn the blades by hand as the motor will be spinning at either 1400 rpms or 2400 rpms down to around 50 rpms for the blades
If the mixer is still running and making the buzzing noise one of the electrical contactors is making the noise and should be replaced.
If the mixer is not running and just making a buzzing noise it can be because off single phasing, check the incoming supply to the mixer and make shore you get the right voltage to the motor (test on motor connection terminals)if the voltage to the motor is right the motor might be faulty
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.
I apologize but im unable to answer yours or any others at this time.Ive been hijacked by another user on this site that is dropping my rating.I contacted firstname.lastname@example.org (manager) of this site about restoring my account but has yet to do so.If my request fall on deaf ears maybe if you can email him and explain that its hard to get info on any hobart products and im the only one that is a hobart tech answering questions for FREE!!As soon as this matters resolved i will continue to help people as ive been doing for a year on this site.
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.