My issue with the mower is that I was mowing grass on a level yard. All of a sudden the back tires stopped moving. So I got off the lawn mower and pulled it backwards. Then the wheels started moving again so I decided to continue cutting grass. The same issue happened once again. So I decided to load my lawn on my trailer to bring it home. By the time I got it home I was able to get it to roll off the trailer. I then started the mower to put it away in my shed. As I was backing up the mower it was moving slower than a snail. When I started moving forward the mower started shacking very badly. I tried figuring out the issue but have not found out what the issue is. I noticed that one of the outside brackets was a little bit bent & the bracket had a bearing inside. This is located on the back of the lawn mower. If you are sitting on the lawn mower it would be on the left side. It is attached to a shaft that is attached to the sprocket. The shaft moves up & down when using the clutch/brake.