I've been through a world of it since I blew a hose on my bucket. Immediately after replacing the hose, I had a clatter that took me a long time to rule out/replace a rubber boot that separates parts on the drive shaft. Trying to eliminate the obvious alternatives to major problems with gears not meshing or other. Turns out my hydro oil was mostly water, and still has a good bit of water after the first change this AM. My question is, can water in the hydro cause a sound like clatter. It isn't isolated to the front or back, which makes me wonder if it isn't related to air or water in the hydro oil and that subsequent changes may rectify it. Other than the hose blowing, this tractor has purred along without much issue for years. Hope someone knows. It is a Ford 1210 if that matters, with hydro static drive.