Jack, can you give us a little more information please. 1) Does the tractor move at all in any gear? 2) Have you gotten a pressure reading from the rear remotes? If so what is the pressure. (you can screw a gauge into a ISO tip to get the reading) You really need to have a flow test done to isolate the problem. I don’t know what it will cost you but it’s worth the expense. Otherwise you’re guessing and with the high price of parts a bad guess is expensive.
That said my first guess is a possible charge pump failure. It’s serviceable without splitting the tractor.(underneath the tractor where you changed the filters) It’s also possible to have a main hydraulic pump failure and cause a similar problem. Even a bad/slipping torque limiter clutch can cause a similar problem. (means a front split, not as bad as it appears) On my 1370 the C4 clutch failed plugged up the internal screen and caused a similar problem. (Let’s hope that’s not your problem.) P.S. you can rig up a set of test gauges to test the Power shift. I bought 5, 300psi gauges mounted them to a piece of angle iron then attached 7ft long ¼ hoses to them. The hose had a fitting to connect to the gauge on one end and a jic male end on the other that screws into a 1/8 swivel adapter to a corresponding port on the cover plate for the power shift.
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