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| The 24 volt system was NOT positive ground. It was floating for starting and charging, grounded at the mid point of the battery to provide a +12 volt wire for lights, and a -12 volt wire for lights and gauges. It wasn't far from the 110/220 volt DC system that Thomas Edison used for electric service in 1885 though he split the generators, not the battery.
The loss of hydraulics with the clutch pushed on a SR comes from a worn out check valve deep inside the transmission case. It cost about $16 in part to convert an elbow to a check valve. I have a web page about that http://www.geraldj.networkiowa.com/4020si.htm that's based on Deere Service Information I found on microfiche. All but the illustrations is available from any Deere parts computer. After I applied that fix to my '68 gas 4020 I can let it set for 4 months, push in the clutch, start it, raise the loader and turn the steering end to end before letting out the clutch. I have rammed the loader bucket into a wall of a basement excavation, pushed in the clutch, spun the steering to the opposite end and broken that bucket full of dirt out of the bank, and then shifted to reverse and backed up without loss of hydraulics. Its a good fix and gives it back live hydraulics. Its not a design problem, its a wear problem.
Champion plugs run cold and won't clean up after fouling these days. And its important to keep the fuel and intake system on the gas tractor cleaned and properly adjusted. My first year of ownership I burned 400 gallons of gas and had that black cloud like an IH diesel when idling. After I opened up the cap of the precleaner, made sure the choke opened all the way, cleaned out mud dawber's nests from the intake pipes, put in a clean air filter, and replaced the worn out float needle and seat, I did the same work several years after that with 250 gallons of gas. It does take some attention to achieve that.
Diesels may be in the process of tossing the governor ring from the injection pump if they haven't been rebuilt yet, they are way overdue. If the ring fails completely (first if fills the return line with bits of plastic) they can blow the engine from letting it run too fast.
I paid enough less for my gas 4020 compared to a diesel 4020 about 12 years ago to pay for the next 14 years of gasoline, all of that gasoline even more after I went no till and then retired though gas prices are abouto 4 times higher now than they were then.
It is true that there are 4020 that are beyond worn out, but they will be easier to fix 50 years from now than the $50,000 2012 utility green tractors made today.
Gerald J. | |
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4020 John Deere info wanted
