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I would say without looking at it a key is sheared or gear teeth are worn on the gear.usually its a sheared key,however if the mixer is older they use a dive key assembly which you would have to replace the shaft.I'm a hobart tech and repair these mixers often,any ? let me know.What is the ml # on the data plate?
Look on the I.D. plate. Voltage should be listed. "PH" is for phase. It will either be single (1), or three (3) phase. "AMP" is for ampacity or the amount of power it consumes. Hobart's manual does not list the motor as an entire replacement unit. It only lists parts as if you were to rebuild the motor. Sorry.
7.8 sounds a little high. I'd inspect the GREASE in the unit. Just take off the top cover and then remove the dust cap. The grease in a D-300 is a really thin grease. It lays in the gear case. If things look dry, I'd consider tearing it down, cleaning it up, and repacking it. Get the grease from Hobart. The wrong grease will stress the motor futher.
To Whom it May Concer: At the school I work we have a Hobart D-300 Mixer. When we mix bread dough it pulls alot of current and trips the breaker. The max current draw on the name plate is 10.1 amps. I have seen the current go over 30 amps during the mixing process. Under no load the mixer pulls 7.8 amps. I dont have any information about this machine on paper and I can only go so far with troubleshooting. My questions to you are: Is it normal for the mixer to draw 7.8 amps under no load? And is their a manual online I can look at so I can check the oil levels and make sure I do not have a low oil/needs greasing condition. Thanks for your help and time, Kenneth Clayton Spartanburg Schools Dist#2