What year is the 4020? Those prior to 1969 had the cross-type grip on top. My 64 has a cast steel top, my 68s have a different metal, maybe aluminum. As for it not threading tight, have you checked the treads? More than one has stripped out over the years.
New ones are available from Deere.
If you post a pic and the serial number, someone here will be able to tell you if you have the right one.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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