This thread seems to have some interesting images which may help you.
https://www.elektroda.com/rtvforum/topic3414419.html
Can you hear noise from the pump when it fails? Can you find a way to load up the steering when stationary and listen to the pump under heavy load. For it to trip the 80A breaker I would think the motor will be close to stalling.
If possible, when doing this it would be a good idea to measure voltage/and or current to the pump.