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Case Tractors Discussion Forum
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David Brown 990 3pt problem

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Robert in NY

09-25-2003 18:58:58




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Hi, I am trying to help a friend out. He has a old David Brown 990 and the 3pt hitch doesn't work anymore. He had brain surgery a couple years back and as a result can not do as much as he use to. So I am trying to help him fix his tractor but I do not know much about David Brown's let alone hydraulics. Is there anything I should look at or does anyone have any ideas as to why the hydraulics no longer work on this model tractor? I don't know much about his tractor but if needed I can get any information anyone might need to help us out. Thanks and take care.

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Robert in NY

09-26-2003 14:04:26




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 Re: David Brown 990 3pt problem in reply to Robert in NY, 09-25-2003 18:58:58  
Thanks everyone, I will be heading over to look at the machine this weekend so hopefully I can get a idea as to what I will have to do and go from there so I might be picking your brains a bit further in a little bit. Thanks again.



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rhudson

09-26-2003 18:42:54




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 Re: Re: David Brown 990 3pt problem in reply to Robert in NY, 09-26-2003 14:04:26  
Hi Robert,
i've got a 990 and 880 both have some type of hydraulic problem. i hope to work on them this winter. i have been using my 990 to pull a 15 foot woods batwing bushhog for the past three days. (my 98 hp MF that i usually use is down) i'm real happy with my 990 and always on the lookout for another David Brown, but they are rare in may area. the 990 is the best tractor i have, by far on fuel.

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Barry

09-26-2003 12:31:37




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 Re: David Brown 990 3pt problem in reply to Robert in NY, 09-25-2003 18:58:58  
Robert, I just got finished with this exact problem. My tractor 990A Selectamatic had been sitting for 3 to 5 years with little activity, and had little attention prior to that. At first my arms would not go up or down. I found that my filter was 90% stopped up, so I replaced it and the gasket. It is located underneath the tractor below the seat area. I then had hydraulic pressure and my 3point arms went up but would not come down. I had a problem in the control valve. It was no small task, but I had to remove the "control lever housing" (front of hyd area), unhook the hydralic lines from the control valve. Remove the drivers seat, the center link attachment unit (sensing unit), the ramshaft cover/lift lock assembly, then loosen the small bolt on the right side of the frame ~1/2"(holds internal pressure on a return hyd line. Then I had to loosen the "control mechanism" (rear of hyd area), remove the ramshaft(part that lifts the arms), then you can finish removing the control mechanism which the control valve is attached to. You can then get to the "latching valve" which is common to get stuck from trash. I hope didn't go too elementary, but it is a good half day job, and all neccesary if the arms won't go down. I encourage you to read some of the archives, as they helped me. I wouldn't trade my old DB for nothing. Good Luck.

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jimtex

09-26-2003 06:24:25




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 Re: David Brown 990 3pt problem in reply to Robert in NY, 09-25-2003 18:58:58  
I had the same problem with my 995, If your new to DB tractors, there is a lever on the left rear of the three point shaft that locks the 3-pt. in the up position. This is a no brainer and is probably not your problem. My problem was the hydraulic pump drive gear. The pump is located in the pto housing and is semi difficult to disassemble without an engine lift or a couple of sober strong men. The pump has a gear on it, the drive gear that turns the pump gear is attached on the inside at the rear of the pto. There is a bolt that holds it into place so that the main pto gear can drive it. if the bolt backs out a few turns the gears will not line up and the hydraulic pump will not work. If it turns out the pump is bad let me know, i have a spare with relief valve attached.

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rod

09-26-2003 03:59:49




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 Re: David Brown 990 3pt problem in reply to Robert in NY, 09-25-2003 18:58:58  
could be filter down low under the rear end is a pan you take it off to get at the filter, could also be blown orings in front of pump, could be adjustment out of whack, send me an email and I can scan and send you some info on troubleshooting and fixing the hyd system if tractor is all red it is an implematic if white and red a selectamatic
regards
rod swinamer



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James

09-25-2003 19:22:43




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 Re: David Brown 990 3pt problem in reply to Robert in NY, 09-25-2003 18:58:58  
If you do a search right here on the case discussion board for "Elmer", you will find all your answers. Elmer is an expert on DB's, and answers every question ever asked about them. Your same question has been asked many many times here and I've asked the same. If you want to narrow your search, us 'Elmer Hydraulics'.

I can tell you your problem is in the control valve on the right rear of the tractor. Before you get too involved, make sure the 3pt is not locked up in the transport position.

Good luck, it's a good ol' tractor.

James

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