I've got an old JD 300 that had a broke rod in it and I also have a JD 216 with rearend issues. I decided to take the good running K341 out of the 216 and install it in the 300 so I have another mowing tractor for the year. I needed to pull the fender pan to get the tank off to clean it and I also thought I would pressure wash the whole tractor while the engine is out and tank/seat pan off. I couldn't believe how much dirt and crud was on this hydro. There was so much dirt on the top of the hydro that the relief valves wouldn't push down to let the tractor free wheel.
After a bath..