EquusCustomLeathers Report post Posted July 25, 2012 I have had my Juki LU563 for a while now. I do horse blanket repairs with it, and a little bit of leather sewing..The last couple of times i have used it, I have had a lot of trouble getting it to stop! I thought maybe I was going too fast with it, but the speed doesn't seem to matter-it just keeps going until I grab the wheel and force it to stop. Anyone have any idea why it's doing this? Please help me out before I get more holes in my hands:) Thanks! Zina Quote Share this post Link to post Share on other sites
TwinOaks Report post Posted July 25, 2012 Unless your motor is classified as "brushless" then it has little rods in it that make the electrical connection. Those are called the "brushes", and over time they wear out. They also leave behind a good bit of carbon(?) dust and that dust could potentially keep the connection closed (providing power). Give the motor a few hard taps with a light mallet and see if black dust is filtering out. Or, it could be a sticky spot on the arm....a bad return spring....etc. Quote Share this post Link to post Share on other sites
EquusCustomLeathers Report post Posted July 25, 2012 Unless your motor is classified as "brushless" then it has little rods in it that make the electrical connection. Those are called the "brushes", and over time they wear out. They also leave behind a good bit of carbon(?) dust and that dust could potentially keep the connection closed (providing power). Give the motor a few hard taps with a light mallet and see if black dust is filtering out. Or, it could be a sticky spot on the arm....a bad return spring....etc. Thank you! I don't know the first thing about motors, so that was really helpful. I'll give it a try tomorrow:) Zina Quote Share this post Link to post Share on other sites
Northmount Report post Posted July 25, 2012 Thank you! I don't know the first thing about motors, so that was really helpful. I'll give it a try tomorrow:) Zina For the motor to continue to run, the switch must still be closed (in the on position). Sticky or worn brushes will not supply power to make the motor run if the switch is off. Most brush problems result in intermittent operation, arcing and sparking inside the motor (sometimes a smell due to the arcing) , low power output, and noise. Motor will often fail to start when brushes are worn and stuck, so then beating on the motor may get it running again temporarily. So check out the switch and the linkage to the switch. Since holding the wheel/pulley seems to stop the machine, it sounds like the motor mounting is somewhat loose so that when you stop the wheel, it rocks the motor a little, so the switch linkage gets bumped far enough to open the switch. CTG Quote Share this post Link to post Share on other sites
bdt46 Report post Posted July 25, 2012 Sounds to me like you have a clutch motor that needs the brake adjusted. There should be about a 1/2 inch bolt on the end of the motor with a lock nut. Loosen the lock nut and turn the bolt and it will adjust the travel and brake in the clutch. When you push down with your heel on the treadle it should lock the brake stopping the motor and machine. When the adjustment suits you lock the nut again and continue sewing. Quote Share this post Link to post Share on other sites
Trox Report post Posted July 25, 2012 I agree with BDT46, thats exactly waht it sounds like, adjust the brake if it is a clutch motor ( a continuous running motor is normally a clutch motor) Trox Quote Share this post Link to post Share on other sites
Northmount Report post Posted July 25, 2012 Sure sounds like Trox and bdt46 are right. Makes better sense, so it looks like you are using a clutch motor. The more info a person can give when asking a question, the sooner you get the right answer. Good luck getting your machine sorted out. CTG Quote Share this post Link to post Share on other sites
