I think the action inside these switches is becoming clearer for me. My recent Post #19 in this thread may help you:I am reluctant to try any replacement without understanding the switching configuration of the rotary switch
You can take it apart, but you have to carefully note how each segment goes together, and which way the cams go. There are little springs and contacts that fall out, and it will keep you "amused" for hours.Is it completely busted? Or just really jammed up?
It's possible to dismantle, clean and carefully rebuild multi position switches. However, it's very fiddly and only something I'd suggest is worth a try if you know you can source a replacement if it all goes wrong!
Yea, tell me about it. I dismantled and reassembled a 12 position one once. Stressful.You can take it apart, but you have to carefully note how each segment goes together, and which was the cams go. There are little springs and contacts that fall out, and it will keep you "amused" for hours.
The problem with mine, was that the cams are on a square central shaft, and the square hole in the middle of some of those cams had worn nearly round, putting the cams out of phase, and jamming it up, and obviously not switching correctly.
I did try an airline and WD40 before dismantling it, and while it helped with it turning nicely, didn't cure the switching.
I got away lightly then, mine was only a 7 position, 8 segment oneYea, tell me about it. I dismantled and reassembled a 12 position one once. Stressful.
I'm very pleased, I'll try to help. Please post on the forum nice, large, sharp photos of the body of this switch, each photo with a shift of about 45 degrees, so that the 'all around' view is available. It is important to see the jumpers (bridges) on the switch terminals, and to count exactly how many wires there are on the primary winding (and how many singles and how many doubles) We count the wires for one (any) phase.The Forum member @Nix2 knows a great deal about these switches and 3-phase machines.