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1941 9n hydraulics

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Ken Jansen

05-24-1999 12:09:13




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I am currently in the process of tearing down and rebuilding the hydraulics on my 9n. It sat for at least two years and it had these problems before it was parked I have been told. I just got it and the three point will raise on its own, or go down on its own. Sometimes it will control to a certain height for a while then it will go one way or the other. Sometimes when it goes up to the top it stays there no matter where the control lever is. I have the pump apart and there is no rust anywhere in the valve assy the unit did definitely have water in it from the homogenized oil I got out of it. I havent taken teh piston out yet. I am mostly looking for ideas as to where to look for damage and wear. There is a little rust pit on the side of the control valve and I have ordered one. The safety valve has some wear on the valve itself and possibly the seat although I can't see it. I know there is a tool for re-seating this valve seat from the manual but they don't give it a number. I would be interested in aquiring one of these re-seaters or an equivalent. And would like any suggestions as to other things to look at.

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DL

05-24-1999 12:58:04




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 Re: 1941 9n hydraulics in reply to Ken Jansen, 05-24-1999 12:09:13  
Mon cher Ken,
9N hydraukic is draft control that means the level of liftings arms is controled by the effort on the third point (where is a big spring).
for using a tool like a mower for example it is very difficult to control the height of your implement un less you fix the level by chains.
Regards.
Daniel



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Ken Jansen

05-25-1999 07:15:43




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 Re: Re: 1941 9n hydraulics in reply to DL, 05-24-1999 12:58:04  
I have chains for the center link and that level is not the problem. The
problem is that the lift arms raise and lower on their own. The control
lever will be at midpoint of the swing and it will be alright for a
minute or two then it will either go up or down from there without my
changing anything. I have found that the control valve has a rust pit in
it and I have ordered a new one. The safety valve has wear on the valve
face, I ordered a new one. I am concerned that the valve seat is damaged
as well but do not have any way of repairing it.

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