Originally Posted by Acker1
I had a problem with the step movement back & forth. 2 mounting bolts had broken off on the back side. Might be something to check.
Same here except three broke and I couldn't see that they were broken until I pulled the motor bracket off. I noticed that the steps seemed to be getting sloppy but couldn't see why.
One of the two machine screws that held the motor was also broken but the head stayed in place. That wasn't apparent either until it was all apart. That was done when the steps were manufactured.
The bolts broke because the blind holes they screwed into were not tapped deep enough. That allowed slop and the extra stress caused one to break and then sometime later the second two broke. The one that broke first had a break that was obviously old.
When the third broke the steps collapsed and darn near pitched my wife out on her face. When I replaced the bolts I used a stronger grade and used washers to slightly raise them so they were tight.
This is a picture of the broken bolts:
This is the motor:
This is after it was reassembled: