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3 point lift range on 8N

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Curt Cooke

01-31-2000 19:34:13




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I'm a Farmall guy repairing an 8N of the neighbors. Had to put a new hydraulic pump in. All's well except the hitch won't pick up all the way. I think that the pin that rides the cam on the inside of the hitch arms is at fault. It's worn, almost gone. Is this a common problem? Am I missing something else?




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BB Stacker

02-01-2000 06:00:54




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 Re: 3 point lift range on 8N in reply to Curt Cooke, 01-31-2000 19:34:13  
The worn cam follower pin is a common problem and should be replaced. I think your problem is probably linkage out of adjustment. I would replace the pin and adjust the linkage as per the book. The pin is available from New Holland. Check the archives because there was a part number problem, I think you have to use a later model pin. One of the real pros will probably straighten me out on this. Good luck

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Curt Cooke

02-01-2000 20:42:31




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 Re: Re: 3 point lift range on 8N in reply to BB Stacker, 02-01-2000 06:00:54  
Thanks alot guys. I replaced the pin and that problem is solved. My next quest is understanding the position and lift controls. I can't figure it out. I can lift the hitch with position control lever up. When I then move the position control to the down position, the hitch falls to the floor and the lift control is inoperative. How is the relationship of the levers supposed to work? Thanks again.
Curt

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EricG.NH

02-02-2000 13:16:20




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 Re: Re: Re: 3 point lift range on 8N in reply to Curt Cooke, 02-01-2000 20:42:31  
Let's start by defining them. The little lever under the seat is the position control lever. It can be either vertical or horizontal. The big lever in the quadrant is the touch control lever. The position control lever selects between automatic position control(vertical) and automatic draft control mode(horizontal). When the small, position control lever is vertical, the touch control lever has a one to one relationship to the height of the lifts arms. Raise the touch control to the 1/3 point and the lift raises to 1/3 it's height. Move the touch control to the 1/2 point and the lift raises to 1/2 it's height. Lower the touch control lever back to the 1/3 position and the lift drops back to the 1/3 height. One to one. The automatic action in position control mode is such that the lift will self correct its height if it should droop, like in the case of minor leakdown. Automatic draft control is another beast altogether. With the position control lever in the horizontal position, the touch control lever acts like a three position switch. The three positions command the lift to raise up, hold or lower. Now this is the action when the tractor is just sitting there. With an implement on the lift, as you raise the touch control lever, at some point the lift will rise and continue to rise until it reaches the top. If you then lower the touch control lever, at some point the lift will drop and continue to drop until it bottoms out. Between these two points is a neutral spot where the lift holds but will not correct for droop. If your quick on the draw you can position the lift to a specific height while in draft control mode, by getting the lift to raise then dropping the touch control into the neutral position. This is the action the lift should take when the tractor is not dragging a plow or other ground breaking or drafting implement. The beauty of the automatic draft control comes in when dragging a plow, where the touch control lever actually sets the depth, and the system automatically corrects for uneven ground. I'll be happy to go deeper about how it does this if you want. The 9/2Ns only have draft control. The 8Ns have both, position and draft. This is where "Zane's Thang" comes into play. His clever device allows the position of the lift to be "fed back" to the touch control, effectively adding a type of position control to the lift on 9/2Ns.
Hope this helps,
Eric

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Jim(UT)

02-01-2000 15:11:01




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 Re: Re: 3 point lift range on 8N in reply to BB Stacker, 02-01-2000 06:00:54  
As I remember, you need to ask the New Holland dealer for the cam follower pin from the NAA. It's the same part as the N but for some clerical reason all the dealer parts books (and software) shows the N pin not available.



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EricG.NH

02-01-2000 06:16:03




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 Re: Re: 3 point lift range on 8N in reply to BB Stacker, 02-01-2000 06:00:54  
As far as I can tell your right on the money. Sounds like your a "real pro" as well! :o)
Eric



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