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Ford 9N, 2N & 8N Discussion Forum
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Lowering Hyd Fluid Viscosity (update)

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Allthumbs

03-06-2008 11:47:08




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I posted on Feb 24 about lowering hyd fluid viscosity in my 8N. I was finally able to get out to the tractor last Sat. Pushing down on the position lever did not increase lift speed as Zane had suggested I try. (I really enjoyed your motor scooter trip story) With the quadrant all the way forward it lifts fast for about 20% of quadrant lever travel then becomes very slow until about 20% travel from top and becomes fast again. Then dropping the lift it is slow until the last 20% travel. With the position lever in draft it does the same except is is slow all the way down. I moved the quadrant all the way back checking after each adjustment and basically the movement is the same. The lift is very slow in the middle travel of the quadrant lever. So I guess this is not a viscosity problem. I have not checked to see if the control rod is bent. I hope I can get back out in a couple of weeks to do some more checking. I know this is not very clear as my recollections are'nt as good as they once used to be. Thanks for all the help I was given on my original post.

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Jerry/MT

03-06-2008 20:26:09




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 Re: Lowering Hyd Fluid Viscosity (update) in reply to Allthumbs, 03-06-2008 11:47:08  
I wonder idf the piston/ring assembly is binding due to scoring or rust ?



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Allthumbs

03-07-2008 02:11:49




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 Re: Lowering Hyd Fluid Viscosity (update) in reply to Jerry/MT, 03-06-2008 20:26:09  
That is what Soundguy had speculated in the post below.(I had double posted) I had originally posted about lowering the fluid viscosity but if the problem is as you suggest maybe increasing the viscosity would help? Thanks



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Jerry/MT

03-07-2008 08:51:08




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 Re: Lowering Hyd Fluid Viscosity (update) in reply to Allthumbs, 03-07-2008 02:11:49  
I don"t think that fluid viscosity is the issue. Viscosity is a fluid property that causes the fluid to resist motion, mainly through shearing forces. You apparently have enough "resistance to motion" in your lift system so you don"t need more. If you had a leakage problem at the cylinder, increasing the viscosity might help reduce the leakage but you"d eventually have to fix the root cause of the problem, excessive leakage.

In my opinion, you really need to attack the root cause of this problem rather than spend money on potential band aids. Have you pulled the side plate and watched the the lift system perform when you raise and lower the three point? Maybe the cylinder isn"t the problem, maybe the control valve has crud on it, or is damaged, or the control fork is damaged , etc etc. Figuring out what the real problem is and fixing it will be the cheapest thing you can do. Everybody wants to get their machine to a useful state but somtimes the fix is not a simple one especially when you dealing with machines that are 50+ years old and were "rode hard and put up wet".

Good luck fixing your problem.

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