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In Reply to: 4020 hydraulic problem posted by Mike on Sunday, February 08, 2004:
I have a 4320 syncro. Almost same issues as the others.When warmed up,and generally while trying to back up wagon,front pump chatters, the steering goes first, then brakes, then three point. So far we have:
1. checked screens and flow to front pump
2. rebuilt front pump
3. Opened trans case and diassembled andchecked
rear pump (hardly any wear)
4. Had dealer do warm flow check (no help)
5. replaced relief valve housing (but not springs
and valves)
The tractor is in my shop now. Is there a good way to check bypass at priority valve or rear pump relief valve? Would appreciate some help. Its a good old tractor, but I have spent a lot on the hydraulics.