Today was 'Motor Day' for the Beogram 4002 (5523) that I am rebuilding right now. The initial evaluation of this unit indicated the need for a rebuild due to the fairly loud running noise of the motor. It seems that most DC 4002s need some attention in this department these days. The sleeve bearings in the DC motor are usually dry due to aging lubricants, and so one needs to take the motor apart, clean it and re-lubricate the bearings. So I took the motor out and took it apart:
This photo shows the upper sleeve bearing after taking the rotor out:
and this one the lower bearing together with the feedback coils and the brushes:
This one shows me lubricating the upper end of the shaft:
and this one while cleaning the commutator with a fiberglass brush:
After putting the motor back together a test revealed that it ran much more quietly again. On to rebuilding the electronic system.
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