How to sell JD 4020 that has no serial number

There's an opening directly underneath the tank. You shouldn't need to remove anything.

https://www.youtube.com/watch?v=VGBO9VcsCIQ

Have you had this tractor for some time or is it a recent acquisition? The JD 4020 1969 serial numbers go from 201100-222159. Lazy power steering to one side has two commom possibilities, internal leakage in the control valve, Or, if the front end had been worked on, the tie-rods were not set to center the steering wheel when setting the toe-in. If that is the case, and the steering wheel is properly centered when driving straight or has fewer turns turning right than when turning left, the steering wheel was re-centered by removing it and resetting it on the steering shaft spline, in which case it is rarely perfectly centered. If that is the case, the control valve may not open much and restricts oil flow when turning right.
It is possible the steering cylinder piston seal leaks in one direction more than the other, or that the front wheel toe-in is wrong.

your number 4045tf258 should be a industrial generator that number is the model number
John Deere 85 KVA 4045TF258 for sale Price 7 359 Year 2005 Used John Deere... notify john deere and use the model and serial number [i have 2 different numbers and are as follows RE506178 Oil Filter 1 RE5 9754;the first should be the new number and the other was the old ] just to make sure of the correct parts number for your unit

U need a shop manual...ur library sec629

Your local Jd dealer can get you service guard tool for that specific pulley or they can advise you on how to remove it. Some dealers may loan you the tool. Just depending on dealer.

Online "images" show the clutch but see a manual or visit a JD forum. The pedal needs to have just enough clearance not to apply pressure when off the pedal.

I think you are drunk ! Drink some decaf tea or some Decaf Coffee and try again.

do you have a bad wire or a bad wire going from the points to the coil

In regard to the problem - JD 4020 Row Crop Tractor; No power Steering
What was the problem and how did you fix it I'm having a simlar problem

Try removing the the transmission shaft and you will likely find that the splines are missing from either the input or output shafts.