A customer from California recently sent me another Beogram 4002 DC platter motor for restoration. I guess, one cannot have too many Beograms around!!!..;-). This is a picture of the motor as received:
I took it apart to extract the bearings:
They are the two small donuts on the small pad upfront. I immersed them in motor oil and pulled a vacuum:
Immediately, strong bubbling started. This shows how the vacuum pulls the air from the porous material, making room for fresh oil to inter-diffuse.
After about 3 days the bubbling stopped and I extracted the bearings:
I re-assembled the motor and installed it in one of my Beogram 4002s for RPM stability testing with my BeoloverRPM device. The BeoloverRPM can log the RPM in 10s intervals over extended periods of time. This is the curve I measured over about 24 hrs:
This is about as good as it gets with the Beogram 4002 DC motor. This motor is ready for duty again!
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