I notice in your pic of broken parts that there is no friction ring present.
It goes between the dampener and dampener back plate.
You do have one right?
The quill shaft is driven from the back of the generator and the torque loading spike is dampened by the twist of the quill shaft and the dampener friction ring.
If you do not have the friction ring and it is metal to metal it will most likely snap as there is no dampening.
50 Amps isn't much. 1.6 HP?
