Replacing seal on Input Shaft. On the end where seal fits and the same end that bolts up to the transmission housing I need to know what the surface is suppose to look like. The shaft slips over the main input power shaft and fits up against a bearing inside the transmission housing. There is a machine surface for the seal then there is another level that I think should be machined to fit against the bearing and be a flat surface but it appears worn and cone shaped. Can't find a good picture to compare to any help would be great.
- Thread starter TKemp
- Start date
Bern
Well-known Member
- Location
- Mount Vernon, WA
Dual Power?
Destroked 450
Well-known Member
- Location
- Harned, Ky
Post a photo of it
Destroked 450
Well-known Member
- Location
- Harned, Ky
Not the best photo of the inside but I dont see anything wrong with that one
Beyond the seal is just the tub that the input shaft goes thru, it doesnt have to have a smooth machined surface, just a rough bore or as cast as long as the shaft doesnt rub the sides
I just pulled that same part on my 3600 today and the casting at the back end is not completely machined nor is it necessary. As long as the 5 bolts attach it to the transmission housing, it can support the rear of the PTO input shaft with that ball bearing found under the snap ring and keeps it meshed into the big gear you see in that hole in the trans at 6 o' clock. In the front, the needle bearing inside the PTO input shaft rides on the drive spindle and center the PTO input shaft and it's spline goes into the PTO clutch plate. so the 5 bolt plate just holds a tube with both shafts rotating inside of it. My front PTO seal was leaking. It was the hardest piece of rubber I've ever encountered cooked by the engine or a hot pilot bearing since 1979 perhaps. Good luck.
I ordered a replacement to compare with. Recommendation from shop foreman at Ford/New Holland dealer is to replace. Hard to see wear in picture but if you start by looking inside large end the first machine surface which looks to be about 1/4 inch wide is supposed to be wider, the next area is the warn area which is concave in shape from wear. This surface fits against the bearing that supports the input shaft. The last machine surface is the seat for the seal and then of course you see the shaft tube. The ware allows for slight movement of main shaft causing some difficulty in shifting at times. If new housing looks same will return but if not don't want to break tractor in half again.
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