2/19/2018 4:02 PM
Check a couple things, I think Tyler and Jefferson both hit on the problem. Wonder if you mowers are not parallel and when they are going up hill the operator pushing up on the handle is causing them to rock and scalp. Start with a bench plate. This could also be caused by the drive roller bearings being shot, put it up on the kick stand then use a bar and a dial indicator to look for movement when lifting under the drive roller with the bar, may also be able to hear it too.