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Beolover SyncDrive: DC Platter Motor Replacement for Beogram 4002 and 4004 (Type 551x and 552x)

Late Beogram 4002 and the 4004 (Types 551x and 552x), which have DC platter motors instead of the earlier synchronous AC motors usually suff...

Monday, February 14, 2022

Beogram 4002 AC Motor Restoration

I recently received an AC platter motor from a Beogram 4002 for restoration. This shows the motor as received:

I removed the pulley, drilled out the rivets and opened it up to extract the rotor and the coil carriers:
Then I submerged the housing halves in motor oil and pulled a vacuum:
Vigorous bubbling started as air was drawn from the assembly.
After 24 hrs the bubbling stopped and I cleaned the parts from excess oil and reassembled the motor. Since the removed threaded rivets cannot be used anymore, I provide 3D printed nut carriers that allow adjusting the motor tilt with two new screws, similar to the original threaded rivets:
If the motor is not associated with a particular Beogram 4002, I always supply additional nut carriers and M3 screws in case the motor is used in a Beogram with belt guides, which also need threaded rivets. See here for an example for a motor with belt guides (usually to be found in earlier Beogram 4000s).

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