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Case Tractors Discussion Forum
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David Brown 990 implematic hydraulics

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Matt Huelsman

07-09-2006 06:34:38




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I have a 1962(I believe) David Brown 990 implematic. The hydraulics have gone out completely. I've gotten some info from this forum, but I'm lost. I believe the pump is bad, as I can't hear it turning anymore. Could anyone point me in the right direction to find a service manual and/or parts for this dinosaur?




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Baz

07-10-2006 23:22:14




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 Re: David Brown 990 implematic hydraulics in reply to Matt Huelsman, 07-09-2006 06:34:38  
To get to the hyd pump, you need to drain the gearbox oil and remove the pto housing. The main control valve is on top of the pump. These are open centre valves which means, if they get blocked [the hole through the centre of them], they will not be held on their seats by oil pressure, then you have no hydraulics. You will need to clean your hyd screen under the gearbox. The pump is getting harder to repair these days. If you need some pictures, email me.

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