A Beogram 4002 DC motor from France was received for restoration.

As is typical, the motor’s Oilite brass bearings needed fresh oil. This requires disassembling the motor and extracting the bearings for a vacuum oiling process.

The bearings were submerged in motor oil under vacuum, forcing air out of the porous material and drawing oil in. This process generally takes about 24 hours.

This shows the bearings after the oil infusion.

The bearings were then reinstalled in the motor housing. The top bearing requires a special tool for installation to ensure a tight fit.

Finally, the motor was tested for 24 hours in a Beogram 4002 using a BeoloverRPM device to measure its speed stability.

The BeoloverRPM records the motor’s RPM at 10-second intervals, identifying any speed fluctuations that would be difficult to detect otherwise.

The results demonstrate excellent speed stability, indicating a successful restoration. The motor is now ready to be returned to France and reunited with its Beogram.