Motor growls growls at slow speed

it could be pedal control or the speed control unit on the motor as it is reasonably common for that machine
take it in for a service to ensure that other factors ( thread around bobbin shaft, fluff etc is not slowing the machine

take it in for a service as slow machines can be from thread and fluff jamming the shafts , foot control or motor problems

1. Remove any stuck material from the feed dog, bobbin area including the hook (pointed object under bobbin). Lubricate as you go.
2. Remove top and end of sewing machine to look at the motor and belt. Place pressure on the foot pedal. Still slow?
3. With bolt attached to motor release the pressure on the belt. Now, place pressure on the foot pedal. Did you notice any increase in speed?
4. Apply pressure on the foot pedal and simultaneously adjust the motor. Adjusting means tightening of the belt and making it move in a straight line. (If it doesn't move straight it puts pressure on the motor so it will move slow.) When you have adjusted the motor to the right position the motor will be at it's highest speed.
5. If the pressure foot is the problem it will require a pro to take care of it.

The problem that I've had with most motors running slow is the drive belt is too tight, out of alignment or too loose. To adjust you need to have access to the belt. Notice where the nut is that holds it in place. Carefully, loosen the nut and slowly push on the foot control You will have to move the motor in different ways until you can notice the speed is at it's highest. This means to tighten, loosen or shimmy the motor to one side or the other. Be careful so you don't get hurt!

You don't say if it is a clutch motor or a servo motor. They answer to your question is yes you can slow it down by either motor (usually a knob or switch) and by pulley. If you don't have a servo motor I would strongly urge you got contact Cobra Steve at leather sewing machine company (google it) Tell him you want one of the smart servo motors with needle position-er (needle up and down automatically)
His smart servo motors are also modified so they work very similar to home sewing machines... with graduated speed based on how hard you press the pedal.

But if you must and want to stick with a clutch motor... you might try this fellow's hack.

http://www.adafruit.com/blog/2007/11/08/hacking-an-industrial-sewing-machine-by-adjusting-the-clutch-motor/
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There is no speed adjust, but 1st you must know the source of the slow down. Remove the belt from the motor pulley and run it, if it goes fast try turning the hand wheel if it is stiff the machine needs clean and oil. If it turns freely you motor may be dirty or just slow. If dirty, sometimes you can without the blet attached run it at full speed for 10 to 15 minutes. It should get faster as you run it. If not motor is weak or slow needs replace. Just replacement motor as genuine probably no longer available.

THE FOOT PEDLE IS NOTHING BUT A REASTAT. A REASTAT IS A WIRE WRAPPED AROUND A CONDUCTOR THE WINDINGS START OUT FAR APART AND GET CLOSER TOGETHER THE FARTHER YOU PUSH THE PEDLE DOWN . THE FAR APART WIRES ARE THE SLOW SPEED THE CLOSER ONES ARE FASTER SPEED
THESE WIRES WILL WEAR OUT OVER TIME OR CORRODE OVER TIME AND CAUSE THIS PROBLEM. TRY SOME ELECTRICAL CONTACT CLEANER AND SPRAY THE FOOT PEDLE INSIDE ANY WHERE YOU CAN AND LET DRY. MOST CONTACT CLEANERS ARE NONE CONDUCTIVE AND DRY IN MINUTES

hi! there,


the foot pedal lectronicaly or carbon speed are controling
the speed of sewing machine motor as long your put
pressure you increase the speed motor,replce foot pedal


cheers and have a nice day,



there are two posibility in this case,check your motor brush
carbon which locate inside the motor,posible change motor

Generally going to have to be addressing the drive motor, either substituting a lower speed clutch motor for the existing one, ie if you have 3000 rpm motor, then going to a 1725 rpm motor. Alternatively, selling the clutch motor and buying a servo motor instead, which should be available with a variable maximum speed control. The Sewquiet 4000 can select different speed ranges with the flick of a switch. If you already have a servo motor and it does not have a variable max speed, then switching the drive pulley on the servo motor to a smaller size should help
A more convoluted solution would be building a support under the table for a layshaft with different pulley sizes so that the motor could drive one pulley and then a smaller pulley on the shaft would drive the sewing machine. Not a bolt on solution but pretty cheap to do if you are good at fabricating.