When you say you can't find the source of the leak, do you mean there is a puddle under the tractor, but you don't see where it comes from? Or is the fluid disappearing and you don't know where it is going?
If there is no fluid on the ground, check the crankcase. The 404 uses a hydraulic pump to circulate the transmission fluid, and the pump seal can fail and let the fluid into the crankcase.
If there is a puddle, clean the bottom of the tractor really well, let it sit and run, and you should be able to see where it leaks from.
I believe the PTO is separate from the transmission, everything else works from a common reservoir.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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