Your tractor didn't originally come with that screw. Other brands use it and all it does is make a more convenient location to increase the fuel delivery. The end of this screw is a stop for the metering valve inside the pump. What was commonly done was tightening the screw on the leaf spring inside the pump that controls fuel delivery which would allow the pump to produce maximum fuel. Then this external screw would be tightened so as not to allow the metering valve to open so much, thus making the engine produce whatever power level was wanted. I have one on one of my 4020's and don't really use it. The fuel is turned all the way up on it and this screw does not touch the metering valve. It's ran this way 32 years for me. Mike
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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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