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JD4240 Rockshaft Control

H

Hay maker2

Member
John Deere 4240 Quad

The three point will only raise if the control lever is all the way back. As soon as I let go of the lever it will instantly move back to the lower position kind of like it is spring-loaded which it is not. The rockshaft is either up or down and nothing in-between.

It does not make a difference where I sent the Min –Max (L-LD-D) too.
I have not remove the linkage from the control lever on the side of the valve housing to see if the binding is internal or external to the control housing. If it were external, I would think that I could set the rockshaft to any position, which I cannot.

I replaced the load control shaft last summer as it was leaking. I have not used the rockshaft after that.
Obviously, something is majorly out of adjustment. Is there a chance that when I pulled the load control shaft out and replaced it something dropped out of position?
 

I wonder if either cam follower(key 9) or follower(key 13) got displaced when L/D shaft was R&R?

mvphoto33993.png
 
So the lever goes back forward when you let go of it?? There is a brake in the linkage to hold some drag on the lever,,that may be the issue for that part,, then for the next part the linkage may need adjusted to give you more control in the upper area of the lever position, this is kind of a complex adjustment that needs followed through step by step,, It is hard to explain in a post on here or over the phone,,try to get a shop manual and look over the procedure,,at that point i may be able to help you understand it..
 
I have a JD service manual.
I know there is a friction device that hold the lever in position, but like I said, its like it is spring loaded when you let go of the handle and it goes forwards. That's why I seem to think its something to do with the draft and wonder if replacing the load control shaft last year is the root cause of it.

I will investigate on Monday
 
Did the load shaft slide back in with very little effort? If you end up fighting it and need to hammer it on through...bad things can happen,,did the feel of the lever change at the time the seals were changed,,there is a bit of "spring" in the lever if the brake is slipping easy.. I am "hoping" that you did not break pin #14..when that happens you need to pull the final drives and lift the ring gear out to repair it..and that is a whole bunch of bad things...
 
(quoted from post at 15:59:27 04/05/19) Did the load shaft slide back in with very little effort? If you end up fighting it and need to hammer it on through...bad things can happen,,did the feel of the lever change at the time the seals were changed,,there is a bit of "spring" in the lever if the brake is slipping easy.. I am "hoping" that you did not break pin #14..when that happens you need to pull the final drives and lift the ring gear out to repair it..and that is a whole bunch of bad things...
Click to expand...

I think the load shaft went in smoothly. I may be wrong as I did this last summer. I just do not remember having to beat on the shaft with a hammer. Honestly, I have replaced a few of these shafts and never had to beat on one with a hammer. Its just not what I do especially known that they slide out with ease.

If I pull the shaft I should be able to look through there with a flashlight and see the lower side of the arm?
 
Yes you can see it looking through the seal hole,,when changing these seals some times the arm is in a bind and it won't let the shaft through correctly,,position of the load lever,lift lever and rock shaft can all contribute to this mis alignment .If you didn't use a lot of force you are most likely okay there,,lever break and adjustment is what you need to look at.
 
(quoted from post at 11:29:24 04/05/19)

If I pull the shaft I should be able to look through there with a flashlight and see the lower side of the arm?
Click to expand...

I think with shaft removed one can see via hole in trans case if keys 13 & 14 are in place
 
(quoted from post at 17:33:48 04/05/19) Yes you can see it looking through the seal hole,,when changing these seals some times the arm is in a bind and it won't let the shaft through correctly,,position of the load lever,lift lever and rock shaft can all contribute to this mis alignment .If you didn't use a lot of force you are most likely okay there,,lever break and adjustment is what you need to look at.
Click to expand...

I removed the linkage and the console lever moves smoothly. If I turn the lever on the side of the control housing its it springs back instantly. Defiantly an issue internally.

I removed the plug in the back and looked in at the arm, its all in place and I can see the roller from the control unit in position against #9 on the drawing the txjim attached.

I know I really need to check the adjustments per my manual, but I just don't want to think that it got this far out of adjustment. Is there any sense in me removing the control housing?
 
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