Deere 333D I recently repaired. This thing turned out to be a total headache. The machine died just like the key was shut off. It was way in the back of a new development and it rained 27 days in May around here. Finally I got fed up and drug it out with a dozer. When cranking it acted like it had no compression, which it didn't. Lol.
Figured out it spun the cam gear which isn't uncommon on these apparently. Pretty poor design in my opinion. Basically the only thing that holds the gear in time is a bolt with a lock washer. No key, no spline, no dowel pin. And from what Deere told me it's a re-stickered Yanmar. So it got new pistons, new pushrods, new cam, and the head was gone through and all new valves installed.