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If the motor itself is slowing down, that is one thing. However, if you mean by "dog" that there is what sounds as if a gear is slipping then the solution is straight forward. The worm (follower) gear needs to be replaced.
There are videos on the net which show how to do this and the Service Manual can be found at:
If it slows down when mixing, it is most likely that the mixer is being asked to do more than it is capable of. If it slows down when nothing is in the bowl, then the motor/gears/lubrication needs looking after.
The lady's model is a K45SS and it does not have a Hall Effect Senor, Her machine di not go to high speed, it STOPPED!!, and that is all we know. If the mixer motor still runs or operates then it is a gear problem and yes it would be the nylon worm gear made to fail in order to protect the motor from burning out. if it won't start at all no noise or movement then it is an electrical problem and it could be the speed control switch the brushes the phase control board the govorner or the motor. what is needed is more information from the lady seeking help.
Your motor needs to be replaced. The speed setting should be able to be set from the start, and if it will not slow down or change speeds, the motor has been over-heated and will need to be replaced. The only quick fix for this is to bypass the speed setting, and change the brushes on the motor. If you do not know how to do this, ask a serviceman to change the brushes only. Brushes usually run about $30 to repair. Although, you will only have one speed.
Yes it sounds like it should be easy to fix. You will need to establish what is preventing the speed control mechanism from moving as it should. It sounds mechanical. Try removing the back cover and checking what moves (or doesn't) when the speed lever is moved.
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