Two things you can do for a 24-year old machine:
1. Replace both motor brushes (Black large plastic Caps on each side
of the Moto Housing). Without these, the motor wouldn't even run.
2. Replace the Worm Gear (the cause of the Rough Loud noises)
Download a copy of the Repair Part List from Kitchenaid.com for
your model KSM90.
Also don't forget to tighten all the screws inside the mixers and use
fresh Kitchenaid Grade Food Grease for all the gears.
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