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| My '68 4020 has hose couplers similar to Pioneer but that are more easily pulled out. So easily they can fall out while working in the field. The early 4020 could have one or two remotes, handles on the left side of the dash with the valves on the fire wall. The later side console 4020 (and 3020) moved the handles to the side console because the valves and the couplers were together on the back of the final drive housing where there was room for three, but at least the last two were optional, so many 4020 were sold with just one. The 4020 remotes are completely independent.
My '68 MF-135 has the typical Cross after market valve with two remotes but three valve handles. The left handle selected three point or remotes, the middle and right valves run the remote when the left valve is in the remote position otherwise the left valve lifts or lowers the three point if the original pump control levers on the right end of the axle are set for continuous pumping, The left handle can be parked in the three point lift position, then the original lift and draft controls run the three point where those controls control the internal pump.
There definitely was more than one way to set up hydraulics on vintage tractors and the makers didn't agree on what to do. They also didn't agree on suitable pressures or flow capability. The 2250 PSI of the 4020 would blow up cylinders made for early two cylinder tractors with 1200 PSI, and the 3000 PSI of an Allis would blow cylinders made for the 4020. The 20 GPM of the 4020 seems luxurious compared to the 4 GPM of the MF-135 and the Allis. And many tried to use unique connectors, but Pioneer eventually became the standard because it worked better.
Gerald J.
Edited by Gerald J. 10/2/2014 10:37
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Why did tractors come with a single front wheel?
