The Simplicity 1721628SM Shaft & Pinion Assembly supports steering control on compatible lawn tractors with power steering and tilt functionality. The assembly transfers steering movement through the shaft and pinion components, helping turn the tractor as the operator directs the steering system. This replacement assembly is designed to replace worn or damaged steering components dur... https://www.wholetoolbox.com/simplicity-1721628sm-lawn-tractor-shaft-pinion-assembly-steering-power-w-tilt/1721628SM.html