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Case Tractors Discussion Forum
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David Brown 990 hydraulics

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Pete from Pense

11-06-2007 14:45:16




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I was plowing with my DB 990 Implematic and the hydraulics just stopped working and would not raise the plow. I just changed the transmission oil this summer and cleaned the wire mesh filter. Anyone have any ideas of what could be wrong?




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Barry Key

11-10-2007 19:29:24




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 Re: David Brown 990 hydraulics in reply to Pete from Pense, 11-06-2007 14:45:16  
The Implematic models have the hold and by-pass valves mounted on top of the hydraulic pump. The pump is mounted behind the diff, in front of the pto housing. There is a plug on top of the pto housing, remove this and you will see a stud. this moves up and down with the hyd lever. With the engine running, the hyd lever in lift, GENTLY, tap the end of the stud. This can seat the valves and fix the problem. If not remove the pto housing and the valves and clean them. They are open centre valves and oil must pass through them.

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richardinnz

11-07-2007 02:08:39




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 Re: David Brown 990 hydraulics in reply to Pete from Pense, 11-06-2007 14:45:16  
If it is a Selectamatic tractor (white painted) it will most likley be some dirt in the by-pass and hold valves, you will have to remove and clean them.



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Pete from Pense

11-08-2007 12:30:43




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 Re: David Brown 990 hydraulics in reply to richardinnz, 11-07-2007 02:08:39  
My tractor is the Implematic (red tractor).



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