Question about Hobart D300 Stand Mixer
Could be a bunch of different things. Depending on how old the mixer is, brushes at the back of the motor. If the brass armature is worn down I have been told its too expensive to replace. They haven't used brushes in 25 years. There are a number of bearings that could be going bad. If the main bearings at the back housing or at the gearbox are badly worn, they may be letting the armature come in contact with the windings. If that is the case the motor will be really hot when running. One obvious question is do you have the proper lubricant and have enough of it? Remove the top cover then pop the inspection hole cover off with a screwdriver. The grease inside should be the consistency of heavy wheel bearing grease. If you had a slug of it on a tablespoon it would stay on it if you turned it upside down. It is a food safe grease available at Hobart parts stores. If the lubricant is thin like motor oil, it is totally worn out and is probably not lubing your bearings at all. One other thing to look at is capacitors. A capacitor looks like a large flashlight battery shaped black object with two wires running from one end of it. It is usually located behind the mixer bowl behind a plate held on by two screws. If your mixer has a "run" capacitor, it may be bad. Remove it and head for WW Graingers or such supply house. Get a capacitor of exactly the same voltage and microfarads. Hook it back up and give it a shot.
Back to the bearings. The main motor shaft should have no play at all if you try to wiggle the shaft up, down or sideways. If it does, the bearings are available at industrial supply houses and are not realy hard to replace if you go slow and have a lot of patience in taking things apart and keeping them in the proper order to reassemble.
Posted on Sep 11, 2010
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Posted on Jan 02, 2017
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