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Case Tractors Discussion Forum
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Case 990 hydraulics

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Tom N MS

06-17-2007 14:19:27




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Case 990 been sitting for about 5 years. Cranks, runs but hydraulics is acting strange. All hydraulic action is within the top 2 inches of the full range of motion. If it is up and you move the lever 2 inches it will be all the way down. I know I need to change the hyd. fluid and the filter in the bottom. What about putting diesel in the hyd sump and running the pump some to flush out the control valves and such? Other suggestions? Thanks

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Gwiz

06-18-2007 19:10:59




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 Re: Case 990 hydraulics in reply to Tom N MS, 06-17-2007 14:19:27  
I believe you are talking about a David Brown 990. Your tractor is probably working the way it should. You need to move the selector on the right rear of the tractor from TCU (traction control unit) to Height. TCU is for plowing and controls the draft of your plow. Pull the 3 point lift lever all the way to the back and hold it against the spring. While the lift arms are higher than the normal 'up' position, you can turn the selector back to Height.
James

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Tom N MS

06-18-2007 20:18:29




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 Re: Case 990 hydraulics in reply to Gwiz, 06-18-2007 19:10:59  
If you removed the hood, it is identical to a David Brown 990 but this is actually a Case 990 I am told. Thanks for the info.



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jonjon

06-18-2007 19:05:20




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 Re: Case 990 hydraulics in reply to Tom N MS, 06-17-2007 14:19:27  
make sure selector lever is in correct position be better to break down the pump to clean, use kerosene on the inside of the tractor.



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