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I have a John Deere 2040 with open center hydraulic pump. The hydraulics works great except when I push the clutch in the hydraulics starts jumping and the pump starts whining. Does anyone have any ideas on what could be causing this?

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Are you positive your tractor is below sn <266,749 because your tractors hyd problem sounds more like CC than OC. How long since hyd filter was changed & sump screen(key 15) checked/cleaned? It's possible hyd filter relief valve(keys 7-9) is stuck open
 

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Discussion Starter #3
Welcome to GTT
Are you positive your tractor is below sn <266,749 because your tractors hyd problem sounds more like CC than OC. How long since hyd filter was changed & sump screen(key 15) checked/cleaned? It's possible hyd filter relief valve(keys 7-9) is stuck open
Yes, it definitely has an open center hydraulic pump. The filter is new and I pulled the sump screen and cleaned it. There was some gunk but it was far from blocked. Would an open center system have this same valve?

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