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Just a thought- what about an electric screwdriver? The motor is geared down to run with a lot of torque at low speeds and if you have a good bearing at each end of the pig and you balance the sideways weight on the shaft, the actual weight may not be a problem as the motor will not be trying to...

I took the coil off the back of the motor, cleaned the carbon dust from it, and put it back securely. The magnet is secure on the motor shaft. Reassembled and tested, still the same- the motor only runs at full speed. The connections from the tacho coil seem to run in to some pretty complex...

Thanks for the advice. I have measured the resistance of the coil again and it settles at around 18-19 ohms. This resistance reading drops as the drum is spun by hand, which suggests there is still some communication between magnet and coil. Maybe its the electronics on the circuit board which...

This is a motor speed problem on a Hoover Performa 1100. Motor brushes replaced a few months ago. Motor should be turning drum slowly in wash cycle but is turning at full speed instead. Rectifier diode on main board (IN4007) has slight blackening around it, and reads infinite resistance one...