Viking stand mixer dough hook will not come off

Go on line and Google manuals

Your Flat Beater, Wire Whip and Dough Hook attachement ends should
look the same. They are inserted onto the beater shaft and held in place
by a single pin. The reason you cannot attach the dough hook to the
beater shaft because it is the wrong hook for your particular model.

A 20 qt "E" dough arm is S-23467. A 12 qt is S-62886.
A 20 qt "S" sweet dough beater is R-8022.

pour a little wesson oil into the attachment holes and work the release while inserting and removing the attachment. Make sure the unit is unpluged. The oil will lubricate the lock mechanism.

It sounds like it got overloaded when you last mixed dough. It will only come off the way it went on. If it has been bent on, it may need a bit of gentle encouragement.

The mixer motor has probably overheated, as proper use and care was not being followed with the stand mixer.

Bread doughs are recommended to be mixed on speed 2 only and never for longer than 7 minutes. With the resistance of a bread dough that is provided against the beater, mixing for over 7 minutes may overheat mixer and cause smoking.

Please consult your use and care guide to refresh your memory about how to properly use your mixer for making bread doughs.

This is not a solution but I think you have a serious problem you might have sheared some gear teeth whent the mixer jammed and it only manifests itself under a heavy load, I would take it to a repair guy, those mixers are expensive and it would be worth it.

Information from manufacturer stating replacement parts have been exhausted.

I had the same problem the first time I tried to make a small batch of bagel dough (very small!) I had to send it back for repair and wait.....sorry that the news is not better.

Does the mixer work in any other speeds?Are you mixing pizza dough and in what speed?I service these mixers alot--i work for hobart.It sounds to me like you have a sheared key on one of the shafts.The mixer doesnt have a clutch.