deere 850 weak points?

[jagyzf]

I have aquired an 850 that seems to be in reasonably good shape. What are the weak points of things that are known to fail on these tractors?

 

[RickB]

The cylinder head won't tolerate much overheating, but you shouldn't overheat it anyway. Keep the radiator clean. The hydraulics don't flow much oil, but that is an annoyance, not a potential failure.