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Case Tractors Discussion Forum
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DB 885 hydraulics

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John in nz

11-22-2003 17:43:09




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I have recently purchased a David Brown 885 and now find that the hydraulics are very slow to lower. Adjusting the lowering speed control does not make any difference. Can anybody help please




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kyhayman

11-23-2003 20:18:37




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 Re: DB 885 hydraulics in reply to John in nz, 11-22-2003 17:43:09  
Had a dozen Case DB's over the years and they have all been very slow to lower without weight on them (except the 1410s, if you use the dump valve). Put a #13 boot with my 230# on the arms and they come right down.



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hoop

11-23-2003 17:13:57




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 Re: DB 885 hydraulics in reply to John in nz, 11-22-2003 17:43:09  
I had a 995 that did the same thing, found the lowering control shaft had broken off on the end, if the knob just spins and never stops try checking that



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John in nz

11-23-2003 21:25:39




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 Re: Re: DB 885 hydraulics in reply to hoop, 11-23-2003 17:13:57  
I have checked the shaft which is OK, and I have a mower on the linkage so there is plenty of weight. Any more ideas.



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Elmer

11-24-2003 04:19:57




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 Re: Re: Re: DB 885 hydraulics in reply to John in nz, 11-23-2003 21:25:39  
Would there be a chance that the rockshaft may be seizing up. Have you tried to lift and lower the linkages by hand to make sure they are free. Can't seem the think of anything else at the moment. That is a problem i usually never come across.



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John in nz

11-25-2003 00:54:31




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 Re: Re: Re: Re: DB 885 hydraulics in reply to Elmer, 11-24-2003 04:19:57  
No problem with rocker arm.I have taken out the slow/fast valve but didn't help. I also took the cover plate off above the valves, and when I lossen the valve closest to the seat oil bleeds out and linkage lowers quickly.Appears to me to be something to do with the control valves. Any more ideas. Thanks.



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wayne

12-01-2003 06:49:05




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 Re: Re: Re: Re: Re: DB 885 hydraulics in reply to John in nz, 11-25-2003 00:54:31  
Jhon

Sounds to me like you have a valve stuck in the top of the valve chest you can remove these buy tapping a tappered stick in the top of them and drawing them out just dont mix them up.
You can then clean them with very fine wet and dry
paper try this hope it works.I have come across this before in the uk if i can help please email me.



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John in nz

12-02-2003 00:30:05




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 Re: Re: Re: Re: Re: Re: DB 885 hydraulics in reply to wayne, 12-01-2003 06:49:05  
I have removed both these valves (one on outside has filter, other doesn't),they both came out freely and I couldn't see a problem.Thanks



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