Based on experience from equipment manufacturers, if they have a motor made which they almost always do, that is just for them and their particular application, the manufacturer of the motor will put a tag on it and when they go to check the tag they will see its only that equipment manufacturer that is allowed to get any information on it.
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In other words, you won’t find a parts breakdown of the motor, its most commonly just, take it apart and find what’s broken, if its a bearing, the bearing will tell you what it is, says on the ring around it and you can replace that, if you need to replace the commutator or windings, forget it and buy a new one.
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Don’t know why you need to rebuilt it but if its a noise issue, like Fixbear said, just remove the splash ring from the bearing, put some grease in there that matches what’s already there or close to it, or at least the same colour and that ought to do it.Â
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Had to do that on a Vulcan convection oven about 8 months ago, still running good now.