Jet 1220vs help needed!

[Mac123]

Hi everyone,
I've just got hold of a used Jet 1220vs lathe, and hope you can help me get to the bottom of a fault.
It has a speed dial from 1 to 5. When I turn it on at 1 it runs slowly, but inconsistently...runs for a few seconds then slows a bit, then speeds up. At 2, it runs slower and sometimes stops, at 3, much the same as 2. 4 is faster, 5 full speed.   

The dial is also sensitive to the touch...gently move it the smallest amount and it sometimes make it slow almost to a halt.

I've tried moving the belts to different points but exactly the same problem. Have tried blowing the motor out with air but no help.

Anyone experienced something similar? Am hoping it's a simple wiring fault or something but am clueless when it come to electrical stuff!

Any thoughts welcomed!

Thanks,
Rick

[Lazurus]

Sounds like the potentiometer has either got full of dust or needs replacing

[Bill21]

Sounds like the potentiometer has either got full of dust or needs replacing

Yes I agree. A suitable replacement should be available from Jet. But check with them before buying as it may be something else.


https://www.ereplacementparts.com/control-potentiometer-assembly-p-939685.html

[Mac123]

Sounds like the potentiometer has either got full of dust or needs replacing

Yes I agree. A suitable replacement should be available from Jet. But check with them before buying as it may be something else.


https://www.ereplacementparts.com/control-potentiometer-assembly-p-939685.html

Thank you both so much...this is really helpful 

Rick