I may be out of line here but I had a 4010 and 4020 and replaced the seal on both. Recalling from years ago, there was a snap ring holding the PTO shaft in place which you remove, catch about a pint of oil, reach in with a curved pick and pull out the old and replace it. I didn't have to drain the 15 gallons of trans hyd fluid.
I do remember the 20 had the dual PTO speed option. Don't think the 10 did. That may make a difference in having to drain or not. Obviously the dual PTO was designed for field speed change so they sealed the PTO from the main sump.
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a Company you can trust and have generous return policies! Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ More Info ]
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.