They all have problems.  Had 2 fan drives replaced on Deere 9.0L engines.  Lack of maintenance.  Funny, didn't say anything about maintenance in the owners manual.  Had a Versatile 400 PTO ujoint fly apart at under 400 hours.  No mention of grease zerks in the owners manual, it was also under a shield, all other ujoints on the tractor are sealed.  I so happened to find it after about 100 hours, and greased it frequently.  When it let go, it hardly had any grease out to the joints.  I would say it wasn't greased when it was assembled.  Charged $200 and the tractor was/is still under warranty.