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John Deere Tractors Discussion Forum
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4020 load control shaft update

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gary in neb.

06-22-2011 04:28:49




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ok, so i checked the adjustments on the 3 point and i dont think it"s even possible to adjust the cable far enough to get it to work at all. i must have missed the yoke on the arm when replacing the shaft. so, is it easier to drop the oil and start over, or pull the valve off the top and try to get the arm back over the shaft?




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Tx Jim

06-23-2011 04:16:28




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 Re: 4020 load control shaft update in reply to Central Illinois, 06-22-2011 04:28:49  
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Tim

I can't remember which is easiest way to replace the cam in the correct linkage? R&R rockshaft housing or just R&R the control valves housing???



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gary in neb.

06-23-2011 05:41:37




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 Re: 4020 load control shaft update in reply to Tx Jim, 06-23-2011 04:16:28  
i did the control valve. arm was off the cam so set that back on and it's much better. still off a little bit, need to adjust the gears but it will work for me to mow hay (if the rain stops). still need to look into the valves to find out why i have "load" on the arms going down and hvae to do final adjustment through the hole in the back. BUT thank you all of you for helping me. it was driving me nuts as to what i could have messed up.

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Tim S

06-22-2011 14:19:16




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 Re: 4020 load control shaft update in reply to gary in neb., 06-22-2011 04:28:49  
I don't think it's possible to "miss" the arm when installing the shaft, but I have had a few come in here with the follower out of place on top ,,some how they jiggled it out when the shaft was out,,I'm not sure how that happened ether, to deal with that the rock shaft comes up and is re-aligned with the follower.



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Tx Jim

06-22-2011 06:05:50




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 Re: 4020 load control shaft update in reply to ND Farmers Wife, 06-22-2011 04:28:49  
Gary

I going to ask you again. DID YOU TRY TO ADJUST NUT INSIDE DIFF HOUSING????
If removing cable and operating lever by hand the 3pt raises all the way I think the nut needs adjusting inside diff housing accessed through the hole in the rear.



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gary in neb.

06-22-2011 06:11:10




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 Re: 4020 load control shaft update in reply to Tx Jim, 06-22-2011 06:05:50  
sorry, i did try that. made no difference if i turned the nut in or out. it seemed like it turned a long way then just stopped, so i'm guessing bottomed out (going in) but the book dont say much. so i tried going out with it and same thing. when i tried adjusting the cable i was off close to 2 inches (not enought adjustment) and the book says to adjust that first then adjust the nut inside in the "L" setting. i guess what bugs me is how can it be so out of adjustment when it worked good before and all i changed was the shaft, bushings and seals.

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Tx Jim

06-22-2011 04:43:30




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 Re: 4020 load control shaft update in reply to David G, 06-22-2011 04:28:49  
Gary

Do you mean you tried to adjust the nut inside diff housing with no success?
It's possible the spring on the actuating cam coincidentally broke. Removing the RS control valve housing would allow you to inspect spring & cam. I see no way one could slid the L/D control shaft in place without it being in the proper place. I stand by my statement that on the early 4020 there's nothing in the bottom to knock off.
This post was edited by Tx Jim at 04:45:33 06/22/11.

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gary in neb.

06-22-2011 05:40:26




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 Re: 4020 load control shaft update in reply to Tx Jim, 06-22-2011 04:43:30  
i agree about nothing to know off but, everything worked fine (other then a down issue that i think is a valve) but now it wont go all the way up. if i take the cable off, i can move the lever by hand and the 3 point will go all the way up. it's almost like it's stuck in the load side somehow, or that i somehow got the shaft under the load arm or it's binding somehow. still could not find my 4020 book but found my 2510 book and it talks about how to adjust the cable, but my cable, with the lever in full up, is about where the arm is to start moving the three point. i know the lever was moved from "D" to "L" when the shaft was out, so not sure if that messed with something or not. i'm at a loss right now.

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thurlow

06-22-2011 07:13:13




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 Re: 4020 load control shaft update in reply to gary in neb., 06-22-2011 05:40:26  
Cable's not moving in the clamp, is it?

On at least a couple of occasions, I've had the 'spool' come off the cam follower (terminology may not be correct) on tractors with a LOT of hours on them. It can happen if the rockshaft is 'over-rotated' to the top. This will result in erratic rockshaft operation....



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gary in neb.

06-22-2011 08:16:08




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 Re: 4020 load control shaft update in reply to thurlow, 06-22-2011 07:13:13  
i sat down with parts book and manual. i think it's got to be something in the top. broken spring, "e" clip came off, something. i agree there is nothing in the bottom that i could have messed up, but maybe when i was driving out the old bushings, i hit the arm enough to dislodge something on the top end. gonna try that tonight and take it off and see what i can see. sometimes i just need to sit and think about these things for a bit.
got a 71 ford convertible a guy dropped off that done run very well, if at all. he had a guy put in a carb kit, did not help. new plugs, wires, cap, rotor, all t hat good stuff. still runs crappy. pondered on it for a day and then "duh" tried to run it with the choke on, and it ran good...lack of fuel. bad carb rebuild. hopefully this will be the same. just a "duh" moment.

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