I have a TB walk behind self propelled model 12A869F011 yr: 2009. The problem is this. As I was mowing along a wall in 4th gear setting when the left rear wheel bumped the wall, this caused the transmission to go from 4th speed to a creep without moving the shift handle. I creep it to the barn and took off the belt and measure it still 34.32 as spec.for this model. I reconnected everything and it still creeps. I adjusted the sped cable all the way out and all the way back in, it still creeps. is there a spring connection attached to the transmission cable because there seems to be no tension on that cable. any help out there.