Trolley won’t switch off fully

Trolley won’t switch off fully. You can still hear buzzing when the switch appears to be turned off.


Usually this is the potentiometer going out of tolerance. It will not return to zero and causes the trolley to buzz or creep. The potentiometer is the electrical part connected to the knob which you turn to make the trolley go.


Replace the whole potentiometer as there are no serviceable parts in it.   To order this part, search by part name in the search box in the top right hand area of this page.