chriswheeler
Platinum Member
I have all 4 manuals on the JD850,950,1050. And to answer your question Danny, unknown. Didn't find a listing of the Yanmar engine model #'s in any of the JD manuals. From what I did find it might lead me to beleave that the 850 has a 3T80, that guess comes from the bore. The basic engine parts ( all internals ) could be the same. That said, many folks say the 950 is just like the YM3000, and that is not the case, I have both parked outside. They are similar, but not the same. JD 950 uses the 3T90J engine and the YM3000 uses the 3T84. If you are the Danny that is in the tractor business, you know that many things on the outside of the engine are different as well. Couple of examples, Yanmar has a decompresson, JD does not, the primer tank on the JD is self filling and doesn't have a cap, Yanmar does have a cap and needs to manualy filled. Air filters are different, JD uses a tubliar affair, and Yanmar uses what might be called a automotive style. The block on the JD is threaded for the block heater, the Yanmar is not. List goes on, you get the idea. For the price, the Yanmar books are the best value. They print a owners manual, a operators manual, and a parts manual. The parts manual is in Japaneese, but you can determine the parts # just fine from it. A person could spend $200-300 for JD manuals and still not have what they need. Just my opinion from having both tractors and having all of the JD and Yanmar manuals for both.
Chris
Chris