Hydraulics issues ford 850

This tractor has set for about 5 or 6 years and with the help of my sister funding part of the cost I got it resurrected from the dead, this tractor has a lot of sentimental to the 2 of us, everything sounds and work good except the hydraulic 3 point lift, what I've done so far to the hydraulic, completely drain it and refilled to proper level, with out a load it works good it will pick me up 170#, did notice when I drained the fluid it was really chunky towards the point of it getting empty (I did run it and allow the fluid to get warm) so I let it drain for a while, after that I hooked the 5' brush hog deck up I noticed that it picks it up but doesn't seem to pick it all the way, it tends to drift down partially and then go back up, it does this the entire time I have the lever all the way up, it lifts it up pretty quick, also, it seems to do better when I give it more gas which I do understand that, your allowing the pump to pump faster when you throttle up but it still drifts and doesn't seem to come up near as far as it does without a heavy load, any advice would be greatly appreciated.
Thanks
Patrick
 
I found it, has a new part# (UF70698 Pin) it can be found at www.link_disallowed for starters not real expensive 5.99 not sure about shipping.
 
8N's part# 374072-S from what I read off another forum posted on 6/17/2002 is the same part for 600 and on up through 900 it the on that I posted about earlier on walts tractor.
 
Been doing some goggling on this part and found the web page I've been looking for, I new I'd seen a diagram and instructions about this pin when I read olds reply (I'd filed it in the back file cabinet in my brain, old's reply jogged it) here is the web page http://www.oldfordtractors.com/rep.htm#q20 scroll way down and you'll see it, I hope it's ok for me to list a web page on here
 

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