John Deere 1020 hydraulic confusion

Randomx232

New User
Okay so here is what i got going on, I have this 1020 diesel in the shop, i've replaced the sump screen because it was smashed, the fluid, and the filter twice. This appears to be a later model with power assist steering i'm assuming. The front pump is pumping, i'm assuming the back pump is working because it filled the front tank by the radiator, but heres the symptoms. When we got it in you could steer it, the tractor wasn't running at the time because of the injector pump but it could still be steered manually. Once we got the fluids changed and the injector pump fixed and got it cranked. The lift doesnt work, and three angry gorillas can't budge the steering wheel. Its stove up completely, I know at least the front pump is pumping and its sending fluid all the way back to where it goes into the casing, just above the sump screen hole. After that I have no idea where the fluid goes or what could be wrong. Help?
 

Welcome to YT
The frt hyd reservoir is supplied oil via the trans pump not the frt pump. Have you checked frt hyd pump drive to be sure frt hyd pump shaft is turning when engine crankshaft turns. If frt pump is pumping it's possible the priority valve(item 16) that is close to hyd filter could be blocking pressure.

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