Your 2020 has a closed-center hydraulics so it needs a closed-center loader valve or it will act as you describe.
Is this something new to you or has it been working properly and now failed?
If it HAS been working properly and has now failed, the only repairable parts of the valve are the closed-center conversion plug and the high pressure relief. Either could have lost an "O" ring or the relief could have otherwise failed.
Most ANY other INTERNAL leak is going to be a cracked casting or a flaw in the casting that has opened up. There are NO internal seals on the spools... they are a precision fit in their bores.
Only other thing I can think of to check is the centering spring at the end of the spool to make sure it is not broken or something is otherwise binding to keep the spool from centering.
If it is new to you and you don't know if it has always been this way, it could be the wrong valve for closed-center or simply need a closed-center conversion plug installed.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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