I haven't used this SG6000 in awhile and when I when to get it from the back yard the shaft was all the way to the left. I tried to zero it out but I was hitting the hardware limit sensors. Intrigued I opened the motor up and see that the gear is off by about 90 degrees. That is, the shaft is to the left 90 degrees when the gear is centered. This is making it impossible to use. I cant figure out what happened or how it got like this. Any tips?