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What vintage 4020 is it? The hydraulics are so different between the side console and the preside console that trouble shooting one for the other won't work well. Virtually no parts are common from one to the other. There could be constrictions in filters, or plumbing, like heat exchanger or up front reservoir. There could be air leaks on a suction point. There could be a cracked piston in the main pump, there could be a cracked case in the main pump, though that should be leaking. There could be a steering valve so worn its grabbing all the avialable flow. There could be a leak doing that. One of the service bulletins for the later tractors suggests testing for pressure and seeing how long it will hold up. With no loads operated other than the pressure gauge on a SCV, it is supposed to hold pressure for 5 minutes. If it doesn't there's a leak somewhere and that can only be found by elimination. The side console 4020 shifts the PTO by hydraulics so that is a possible leak. In the I&T manual there is a flow test for the charge pump, but only for preside console tractors. It says there will be damage if the same test is run on the later tractors. There could be a bypassing leak in any of the valves, steering, rock shaft, brakes, diferential lock, remotes from a worn valve. 2800 PSI is way high. Should be 2250 according to my manual. Gerald J.
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