Sewing machine is sewing slow
This could be for several reasons. I would try the easiest "fixes" first, such as: remove the needle plate and bobbin cover plate, and clean all lint from these areas, including between the feed dog teeth. Lint can quickly accumulate and bog the feed dogs from advancing correctly; oil all moving parts of your machine after removing the top covers, side covers, and the needle plate & bobbin cover plate as mentioned previously--oil anywhere in which metal moves against metal, but make sure you remove all lint or dried oil gunk first; check the belt of your machine to see if it is too tight if it was recently replaced--if it hasn't been replaced or adjusted in a long time, it would more than likely be too loose rather than too tight, but if too tight, it will bog the motor down by making the motor pulley too hard to turn; slowly turn the machine's hand wheel by hand without power with all of the covers off as previously stated and watch everywhere the machine moves--see if anything looks bent, is hitting something it shouldn't or making clanking or clacking noises somewhere as a part may be bent and rubbing somewhere, slowing-down the machine (and of course, if you know the machine has been dropped or damaged, something bent is highly likely which may require a repair tech); check your foot controller--is there something physically blocking the pedal from depressing completely?--these controllers also sometimes just need replaced, so as a test, you may borrow one to test on your machine and see if that helps; if your machine has a fast and slow sewing speed, make sure that setting is not governing the machine from sewing fast; check all of your power cords, plugs, and controller connections to make sure everything is plugged in securely, and maybe try your power plug in another outlet; and lastly, it could be your motor--the motor may need new brushes, some motors require a drop of oil now and then for the bearings (your manual should tell you this if so), or the commutator may have a common build-up of carbon residue that can be removed, and you may have just worn-out your motor that can be replaced. And as always, make sure you are using a new needle after encountering and hopefully fixing an issue.
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