Mend > Sewing Machines

Mend Bernina 840 Need Know Replace Motor

Need to know how to replace a carbon brush in Bernina motor?

Hi -
I collect & enjoy older SM's. Are there any schematics or photos showing how to replace a carbon motor brush in a Bernina motor - specifically a vintage 840 (1983)? I unscrewed the brush cap and cannot see anything... I am not sure of what the exact dimensions of these brushes are, have not bought a replacement yet. The groups mention that there should be a spring as well.

I need to learn to do this because my other machines can probably use the same help..

thanks

divni
March 2008

Bernina Bernina 840 Household Appliances, Sewing Machines Need Know Replace Motor

Thanks Ken -
my problem is that I do not see anything in the hole - just a brass nut at the opening -
the symptom is this - machine runs on low speed setting, but is extremely s..l...o...w..... on the higher speed motor setting.
Can a motor run without a brush, is it possible there isn't one in there ?

divni
March 2008

Hello Divni,
There should be a spring and a very small brush, you might be aboe to get a schematic from www.sewusa.com but providing you can get to the motor easily you should be able to fit new brushes.

drivewithken@blueyonder.co.uk
March 2008