Problem is usually the hydralic pumps leaking oil into the crankcase.  The pumps can work okay but still leak hyd oil into the engine crankcase.  We had to put both new ones on our 1150 a couple years ago because of the same problem and both pumps functioned okay but leaked oil.  Our 895's have done the same thing as well.  You might try Richland County Equipment in Wahpeton, ND.  They are no longer a Buhler dealer but have many years of Versatile experience.  I believe the number is 1-800-642-9266.  Hope you fix the problem.

Chris