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I just did mine this past weekend and I'm a new 8N owner. It was a simple job. Be sure to reference an F04 manual for complete instructions and diagrams. Drain the oil or hydraulic fluid first. All three drain plugs. The drain plug for my differential was dry, so I inserted my finger and found about a half inch of crud covering the drain hole inside. Remove the 4 bolts holding the cover and pull the assembly straight out. It needed a little persuasion to break the gasket loose. I tapped on the cover, from the side, with the handle of my hammer. The biggest challenge was removing the snap ring so you can remove the shaft from the housing. I used a couple of small screw drivers and some needle nose pliers. The seal is press fit into the housing so it takes a little persuasion getting it out, and putting the new one back in. I found that the collar on my shaft needs replacing, but that will have to wait. I didn't have the part and needed to get my tractor back together. I put a new gasket on the housing and now have no PTO leaks. My shaft collar was so bad that I'm expecting a leak at any time. It will probably be next winter before I replace the shaft sleeve and put in a new seal. Good luck. Have some rags available.
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