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Have a 4600 which may be somewhat similar, I think. Mine has the single square front axle and single steering arm going down the left side of the tractor. If yours is not like that; like you have 2 steering arms, you will have a different arrangement; but the mechanical principles are the same as far as retaining the stack and sealing the fluid. Going talk about mine. There is a seal on the shaft above the gear box. It's not at the top of the steering column where it would be easy to replace, it's right on top of the gearbox. It's been a year so I'm a little vague but I think I'm correct. Steering wheel has to come off. (When you are finished, New Holland has a nice little 15" wheel for a very reasonable price and you can buy a "horn" button to fit it and make it look real sharp, and handle great. You don't need a 17 or 19" wheel with PS and they just get in your way trying to get on and off and work.) There should be a felt dust seal at the top of the shaft and maybe a bearing to support the top of the shaft. They can stay put when it comes time to slide the shaft out of the housing (stack). You have to loosen the upper Shroud (almost take it off) and remove the lower side shrouds that cover the steering box. 4 screws in the steering box top come out which hold the cast iron "stack" steering column housing on. There is a seal there too for the steering column to stack seal.The seal you are after is in the underside bottom of the stack about where it flares to fit the steering box. When reinstalling, you have to insure that the seal rides on a nice clean, slick, steel, portion of the steering shaft so that it will seal and the new sealing surface won't be damaged. The manual talks about measuring this and that. If you have corrosion you will have to do something about that....move the seal down 50 or so thousandts would do it. (Maybe that's why I had machine work done....explained later.) Don't remember what rides on what, but there are about 20 or so loose balls (5/16 dia) that go around the shaft and they have to be properly placed to get the shaft to go back in correctly. I didn't know that (pay attention to where they were when I disassembled) and it took me a long time to get things back together.....I couldn't get the stack to seat back on the steering box....it sat about 5/16 too high and wouldn't budge....hmmmm tell you something? The other thing as I recall is that the steering shaft has a worm gear on it and you don't want to turn the steering column with the "stack" off as the column will unscrew allowing the balls to fall out of position and you play heck getting it all back together. BTDT. Additionally, I had to take the stack to a machine shop and have them open up the inside a little to get things to fit back in place. I think I did this before I figured out that I had the balls in the wrong place or it was to move the seal. Not sure. But once I did that I didn't have to pay any attention to the dimensions in the book as I had plenty of room. Try to record what was where when you disassemble it as it will help in reassembly. Pay particular attention to the shaft screw position and location of the balls. Also location of seal on stack. You really need a manual or be mechanically inclined as you can be mechanically challenged on this the first time you do it. And allow yourself several hours. Good luck. Mark
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