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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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