Go Bottom3 Point Hitch 3520
 | whiteturbo
Join Date: May 2005 Posts: 77 Shelby NC 
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2008-10-12 157197
I have a 3520 cab tractor and if I raise my 3 pint hitch all the way up it will slow the engine rpms down and puts it in a bind. It is a HYD drive and it will even slow the tractor down until I lower it a few inches to let the pressure off. I also noticed that when i lower it the hitch will drop all the way down with only a little movement at the leaver inside the cab. When it starts to fall all the way down I can pull back on the leaver and it will stop it. This just started a few weeks ago. It also has a factory diverter valve for the 4n1 bucket. It has 300 hours on it and fluid looks very good. I think it should be changed around 450 hours but thinking about doing it before then. I owned a 4310 before this one and it had a screw on top of the hitch that would stop it (I think ) but i have not found anything on this one. I did find a shaft on the left side that has a screw but I think it may be for the stop going down as i moved it and it did nothing to stop it from going up too high. Thanks for any help someone may have with this.
Jack
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 | candoarms
Join Date: Mar 2007 Posts: 1932 North Dakota 
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2008-10-15 157262
Jack,
I wish I could do more to help you, but unless I was able to see the plumbing, there just isn't much I can do but take a guess.
It's always best to eliminate those things we can. It helps with the troubleshooting process.
Remove the loader and disconnect all of its hoses. Try operating the hitch again. If the problem persists, we can eliminate most everything in the loader circuit.
This will give you some idea where to go next.
Joel ....
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| whiteturbo
Join Date: May 2005 Posts: 77 Shelby NC
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2008-10-15 157265
I found the problem and repaired it. I found a .29 cent roll pin broke. The rod that hooks to the 3 point hitch hooks to a shaft under the cab on top of the transmission. Not very easy to install on a cab tractor but working good now. I found about half of the pin sticking out so i think it may have not been installed all the way in at the factory. Thanks for the help anyway happy it was something so simple MONEY WISE.
Jack ....
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