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Sewng machine motor housing

My machine is actually a Bernina 830 (mechanical 34 years old) I need to know how to get the housing off the motor so my hubby can replace the brushes

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  • Anonymous Mar 25, 2014

    I have purchased a Bernina that has a decal showing it has a 110 V motor inside. However, the previous owner claims to have used the machine for a number of years in Australia (where we have 220V). How can I tell if the motor was changed over to 220V?

  • Anonymous Mar 26, 2014

    "PresserFootPosition lost steps" error message keeps occurring necessitating machine restart.

  • Anonymous Mar 31, 2014

    machine seizes once per revolution of the cam gear until manually crank the hand wheel until get through rough patch, then runs then seizes again and so on. How do i replace the gear and where get the part?

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DISASSEMBLY TO INSPECT OR CHANGE BERNINA 830 MOTOR BRUSHES:

Remove the big plastic cover piece on the bottom of the machine with the single screw in the center.

Remove the machine's end panel by removing the single silver screw from underneath the bottom middle of the side panel. Pull the bottom of the side panel out and down to remove it. It comes off easily.

Remove the two screws under the motor assembly (silver screws with black washers).

Swivel the motor assembly enough to remove the belt.
There is a another plastic panel on the motor assembly over the motor itself. Remove the two phillips head screws to remove this panel.

At this point you can see the commutator and inspect the "business" ends of the brushes. (In our case, one brush was almost gone and there was nothing left of the second brush except the spring!)

You can then slide the motor out of the housing. I pushed on the motor pulley and pulled on the other end of the motor with pliers. The motor comes out rather easily, but be careful not to disturb the wires any more than necessary.

With the motor exposed, unscrew the caps over the brushes and remove the brushes.

Our motor's commutator looks significantly worn and the motor may need to be replaced. If you find a source for the brushes or a replacment motor, please let me know! Thanks, John john@jldnet.com

Posted on Feb 17, 2008

  • kdg_surf Feb 16, 2014

    unscrew with what? there is no screw slot

  • Neal Iund
    Neal Iund Aug 15, 2014

    Regarding a damaged commutator with reference to John's comments. If the commutator is damaged, the commutator will have to be resurfaced on a lathe to provide a smooth cylinderical and concentric diameter. Motor brushes will also need to be seated to the commutator since the radii on the brushe ends will not fit to the outside diameter of the commutator. After seating the brushes with a brush seating compound stick, I typically use a fine green Craytex stick to finish or polish the commutator. You will also want to lubricate each spherical bearing in the motor with a class 68 machine oil. Failure to resurface the commutator will not only wear the brushes out quickly, but the motor tends to overheat. Brushes and tools can be purchased...see www.sewtechnical.com

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I need a motor pulley for my bernina 830
can you help me find one????

tesaeck@netscape.com Thank you!

Posted on Apr 11, 2011

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My machine is actually a Bernina 830 (mechanical 34 years old) I need to know how to get the housing off the motor so my hubby can replace the brushes

Re: sewng machine motor housing

DISASSEMBLY TO INSPECT OR CHANGE BERNINA 830 MOTOR BRUSHES:

Remove the big plastic cover piece on the bottom of the machine with the single screw in the center.

Remove the machine's end panel by removing the single silver screw from underneath the bottom middle of the side panel. Pull the bottom of the side panel out and down to remove it. It comes off easily.

Remove the two screws under the motor assembly (silver screws with black washers).

Swivel the motor assembly enough to remove the belt.
There is a another plastic panel on the motor assembly over the motor itself. Remove the two phillips head screws to remove this panel.

At this point you can see the commutator and inspect the "business" ends of the brushes. (In our case, one brush was almost gone and there was nothing left of the second brush except the spring!)

You can then slide the motor out of the housing. I pushed on the motor pulley and pulled on the other end of the motor with pliers. The motor comes out rather easily, but be careful not to disturb the wires any more than necessary.

With the motor exposed, unscrew the caps over the brushes and remove the brushes.

Our motor's commutator looks significantly worn and the motor may need to be replaced.
===============


FWIW, if your machine hasn't been oiled for a long time, you should probably take time to do that. When the old oil solidifies, it sticks the moving parts together. Forcing the motor to try to run the machine can damage the machine. Use fresh good quality sewing machine oil or (I use) liquid Tri-Flow Synthetic Lube and apply a couple drops every place metal rubs on metal. (Wiggle the handwheel and watch where things move.) Do NOT oil belts, synthetic gears, cams.



...

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If the 830 is a later model machine with the type 232 or 290 foot control and it is determined to be defective, no problem as they can be repaired.
4. If the (known good foot control) still does not work, you can assume that the motor has a problem. Motors for the Bernina 830 are occasionally available on EBAY and other sources.
Note: If the motor brushes have worn out and the commutator has been damaged, the motor is also salvageable.
-------------
Note: Always unplug the machine from the mains power when not in use as per Bernina instructions.


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