Question about Heating & Cooling
these people can help. but from what i know when looking into my Elna Supermatic 722010 is that your knee lever controls a series of reeds, the contacts must be clean, this can be viewed by flipping over the machine and taking off the base with the three screws. Next take off the hand wheel and inspect the motor's commutator and brushes. They must be clean and not scored. The friction wheel should be looked at while your in there so that it has no flat spots (that would make the growl or thumping sound) Hope this helps...
Posted on Jul 01, 2010
Posted on Dec 11, 2009
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Posted on Jan 02, 2017
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