Although I no longer own one of these machines, I have owned one and repaired a few. There must have been a huge number of variants on the basic design, as I have never seen two exactly the same.
1. Single motor, directly under the spinner. it drives the spinner through a clutch which is operated by a cable from the spinner lid. (close lid to start spinning.) Belt drive off the spinner motor, around a couple of idler pulleys to change direction, then to the wash gearbox, and a second belt drive from there to the pump.
2. Twin motor, one for spinner and one for wash gearbox and pump. Spinner motor drives spinner directly (no clutch). Spinner has a brake drum with a leather belt around it. To spin - close lid. To brake - open lid, microswitch cuts power to spin motor, energizes brake solenoid, which pulls leather belt around brake drum. Brake is hopeless, drum still takes ages to slow down. This is the model I owned.
3. Twin motor - one for wash and pump, one for spin. Spinner has no brake and no hinged lid - just a cap like a saucepan
lid. There is one lying in a collapsed shed near my house, I am chasing up who owns it so see if it can come home with me.
4. A Simpson badged version with an standard agitator instead of the paddle.
5. A Pulsator model with a big horizontal pulsator in the floor of the wash tub.
These machines were promoted as being made from rustless fibreglass, that is true of the wash tub and top, but the outer spin can is made of galvanized sheet metal which is very prone to rust.
The wash action of the paddle is fantastic. It can clean anything. (big claim!) I repaired one a few years ago for an elderly lady who bought hers new, on recommendation from a friend who worked on a sheep station. She said if it could clean their washing, it could do hers. When I fixed it, I repaired rust holes in the outer spin can (with fibreglass), she said it was the first time it had needed repair and it was about 25 to 30 years old then.
Chris