4110- 3 pt hitch wont raise

[RG1]

Getting the thing mounted back in the correct position that makes the 3 pt raise and lower correctly and completely is a real PITA. The lever attaches to a stud on the side of the upper tranny housing via a cinch bolt. If it isn't in the right spot on that stub shaft, the 3 pt will not work. I am not sure I can explain this so that it makes sense to you, but here goes-

IME, the easiest way to find out where the stub shaft needs to be oriented is to take the rockshaft lever off and use a pair of pliers with rubber jaw protectors on them. With the engine running, grab that stub shaft and twist it one way or the other slowly until the 3 pt starts to raise. The range of motion that will actually make the 3 pt work when rotating that stub shaft is very small. Too far one way or the other and you get nothing. Once you get the 3 pt to move, work slowly in either direction from that until you find where the 3 pt is fully raised then re-mount the rockshaft lever in the up position on the quadrant, but be very careful not to let that stub shaft move even a little bit when re- attaching the lever or else you'll be back to square one. If you get the 3 pt to raise just a little too much you will trip the relief valve and you will hear it. There is supposed to be about 1.5-2" of free travel/play at the top of the 3 pt's lift to allow a margin of safety for times that you have an implement like a bush hog mounted and cross a ditch or something similar and have the tail wheel drag. If there is no play at the top of the 3 pt's lift stroke, the tail wheel will act like a prybar and transfer all the force to the toplink and trans housing.

I hope that makes sense to you.

 

[Gumby542]

I have a task for tomorrow- thank you!

 

[Gumby542]

So, the lever was taken off from the plate only. When I looked at it. I figured that wasn't it. However, I found out this afternoon at the whole rockshaft was replaced because the gear stub had been broken off of the one on it originally. The valve was original to it. Thoughts on if I should will look at this as a potential issue?

 

[RG1]

Either it wasn't repaired/replaced correctly, or it is still what I was trying to explain above. It wouldn't surprise me one bit if the rockshaft stub shaft is not in the correct location rotationally speaking. it is a very small window to find, and just a hair off on either side and the 3 pt does nothing.

 

[Gumby542]

How does that plate come off? Mine has a bolt through the bottom going front to rear, two Allen heads going into the rockshaft and a square head at the bottom of the U.

I really appreciate the help

 

[RG1]

What I'm referring to doesn't involve the plate at all. The shaft is the round piece in this link below that fits through plate # 4 at the bottom and into piece #12. You have to loosen up nut #11 on bolt #9 to do what I am talking about. Take part #12 off, but leave the plate #4 alone. Slowly rotate that round stub shaft one way or the other until the 3 pt upper arms start moving (with the engine running). Rotate it very slowly until the 3 point raises all the way, but leaves the recommended 1.5-2" of slack at the top (do all this without the lower draft, or the lift arms mounted). Now re-install #12 with the lever in the full up position being very careful not to move the stub shaft at all because even a 1/16" rotation makes a difference, and snug up the nut/bolt and work the rockshaft lever to see if you get full up and down motion. Adjust #12 on the stub shaft until you do (this is assuming that everything was re-built and re-assembled correctly, and that they simply didn't get #12 located in the right position on the stub shaft).


http://jdpc.deere.com/pimages/MP20/MP20278________UN22DEC98.gif

 

[Gumby542]

Does plate 12 have to come off? I tried rotating that shaft with the thru bolt off. My top arms are not attached to anything. I was only able to rotate that bolt about 90 deg. Is there more movement if the #12 plate comes off?

 

[RG1]

I didn't remove #12 on mine because I was so close to the correct spot to begin with. IIRC though, 90 degrees of rotation sounds about right. If you still aren't getting any movement during rotation throughout the complete range, something is not correct inside of it somewhere.

 

[Gumby542]

Update- I just put a known good, taken out working, valve and put it in my tractor. No movement. I then tried moving that shaft again, still nothing. Tried moving the open/ close and turn that shaft, nothing. Im feeling comfortable my valve is not the issue. I was told the system relief valve was changed when the rockshaft itself was first changed. Should I change that piece first, or should I swap the old rockshaft with the broken driveshaft out back on and see if it works then? Thoughts?