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My wifes Oster Kitchen Center slowed down and I think finally stopped. I say I think it did because I took it apart two years ago and am finally finding the time to get it back together. I cleaned it, checked the brushes on the motor(all of this is in the base unit with the control buttons on it. The upper blender/beater arm has no electrics in it.) The brushes were coated with some kind of dried crusty stuff which was keeping them from contacting the motor.I put it back together and tried it but it only hummed and did not move.
I took it apart again, this time everything came out. Motor, electric wiring plus the metal gearbox attached to the motor which drives the blender and the upper arm. I took the transmission apart (it's attached to the motor in the base unit) and found the gears in it were so gummed up with who knows what. Probably everything that leaked out of the blender.
You see, what happens is that the seal between the blender black base and the glass jar started to leak after a few years but we don't notice it. Maybe we did but we cleaned it and we thought it was all good. But the liquid can leak down into the bottom unit around the drive teeth and that little square drive that the blender locks onto. And then it goes into the gearbox and the motor. So it is a major job to clean it. Since I don't have a manual for disassembling the lower base unit, I'm just putting it back together. I cleaned all the gunk out, put some grease on the gears and the gearbox is working better but I fear not perfect. It is 30 years old!! So unless you take it apart yourself or find an appliance repair shop (is there such a place anymore?) it might not be worth the effort. But it is do-able. How long have you got?