Gone on strike maybe.

What about the other end of the motor ?

There's a type of older motor that uses brushes to start which can be reversed by rotating the brush carrier, no cap involved. So if they come loose……..

You could phone the manufacturer and chat to the people who made it

Terry

Your picture album shows the label telling you how to reverse the motor by swapping leads about. The rectangular box attached to the motor could well contain a starting capacitor, they don't have to be in cylindrical form. How that can switch to reverse on it's own I don't know unless the motor has ingested swarf into the internal wiring and that is providing the new starting "wiring"

It might be appropriate to change the motor anyway for a more modern one.

Brian

My guess is that it would not have a capacitor. You can achieve the same result with windings of different inductance, so one winding will be lots of turns of thin wire, the other fewer turns of thick wire. It is probably the thin one that has failed.

Martin

H&S look away.

Slip the belt off, wrap around the shaft a length of soft cord, note the direction you did the wrapping, give the cord a firm pull and switch on. Note motor direction of rotation, switch off. Do the same with the cord, but in the other alternative direction, switch back on and again note DOR. You have just tested the run winding for continuity. So your fault is in the start circuit and most likely the centrifugal switch..

That terminal box doesn't look like the original one and no signs of a capacitor, so as Dave says, a spilt phase. Before you take it apart to hopefully locate the fault, with a scriber mark both bell ends. Two marks on the drive end and single on the non drive end straight across, these are to help you when reassembling the motor. When withdrawing the rotor be very care full not to scratch the windings and break a wire, as it can be very difficult to locate the other broken end and carry out a repair, also don't let the rotor fall on the workshop floor and bend the shaft. Do not oil the centrifugal switch mechanism, you might need to clean up the contacts. Once you have the motor reassembled, and for your own personal safety you ought to get your friendly electrician, to give it an insulation test, before connecting to the supply once again Let us know how you get on and don't forget the most important wire the EARTH. John

As a last ditch it might be worth putting shrink sleeve on the wires, replacing any that have burnt away and try it ! If it still runs backwards or takes the trip out – your right, your buggered ! Noel

Hi Terry, $#it happens, but I would investigate Noel's idea, although you will probably have to take the back end off to get all of the bare wires covered, shouldn't be too difficult to do, just take photos of each stage so you can put all back together correctly.

Regards Nick.