Is there a a way to lower the speed on a Brother DB2-B735-3 industrial sewing machine?
Boy Howdy, I read the other answers and there sure is a lot of misinformation to be had out there. So, here’s the straight skinny: In the absence of an electronic speed regulator on the motor itself, the only way to lessen the speed is to change the pulley on the motor. The basic rule of thumb is the smaller the motor pulley, the less the speed of the machine. Take off the belt guard on the motor and you will see the pulley. Remove the belt by raising the motor and loosen the allen screw holding the pulley on the end of the shaft. There is also a woodruff key which fits into a slot on the shaft and the pulley and keeps them from slipping against each other. Just be sure to put it back when you change the pulley,,,it’s easy. You will be able to find the pulley at a good hardware store. You will also need to retighten the belt again by loosening the bottom nut on the long bolt which supports the motor and screw down the upper nut until the belt is as tight as you want without binding the
