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 - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
... [Read Article]
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