As I looked over the lift, noticed something that seemed odd and measured the wheels. One front tire is worn 1 inch shorter than the other. My guess is someone put a used tire on. I removed both front wheels, raised the front end without the tires on, and engaged the transmission in both forward and reverse gears. The hubs turned as they were supposed to both ways. I also inspected the hubs- and nothing seems out of the ordinary I am ordering a set of new tires , guessing that with one wheel worn away and not letting the lift sit on on the floor properly has something to do with this problem. Any thoughts on this? Thank you for your information.