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Old 4th Jul 2019, 6:32 pm   #5
paulsherwin
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Join Date: Jun 2003
Location: Oxford, UK
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Default Re: Singer 99k sewing machine repair

Can you confirm that the motor runs roughly with the drive belt removed?

If there is no obvious mechanical play then the first thing to do is clean the commutator contacts carefully. You can do this most effectively by dismanting the motor, but you can improve things a lot by removing the brushes and cleaning as best you can. T-Cut or Brasso will get all the crud off, but you should clean off any residue with IPA or meths afterwards.

Check the brushes carefully.

If the worst comes to the worst you can buy a modern replacement motor and pedal for about £30. You should be able to fix the original motor though - they were made in vast quantities and are tough as old boots. They normally last forever with occasional lubrication.

Graham, I strongly advise you to lubricate the motor bearings. They're probably bone dry by now.

(1934 Singer 201K user, original motor)
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