The solenoid winding is an electro-magnet. When you energize it - it pulls a metal swing-arm that acts against the shut-off spring. I.e., power creates magnetism that pulls against the spring and puts the pump in "run." Cut the power, and the spring shuts the pump off.
If you took one assembly off (cover with solenoid, plunger and swing-arm), put power to it and saw no movement - I'm assuming that is because the metal swing-arm was already all the way over in "run" position. You DID say it wouldn't shut off, so I assume that's where it was. If so, it can't move any further, bad or good solenoid.
I wasn't disputing your problem or your sucessful fix. But, I know some people on this forum don't realize how that solenoid works - and the same type is also used in many farm tractors.
The older solenoid-swing-arm assemblies had no plunger to get stuck inside of them. The later ones do. Probably what happened is what Bob mentioned. Some debris got stuck in the plunger, plunger stuck in its bore, and the swing-arm got stuck in "run" position. I've seen many do it. Usually pretty easy to pull it apart, clean it and get it working.
The older solenoid assembies had no plunger to get stuck. But, the plunger was added because the plungerless assemblies had the reverse problem. They wouldn't always pull the pump into "run" position. So between the two versions, I guess I'd rather have one that got stuck in "run", rather then one that got stuck in "no run."
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