4110- 3 pt hitch wont raise

[DFB]

Not sure on how it came down to the valve as the issue. I rebuilt the valve based on pics from the service manual. I had all of the pieces. I know I can buy at least most of the internal components for it. I have not trid the sensitivity screw, but can today.

My next question is how does fluid move through this system? Is their a relief on the pump? I'm ordering the manual today, have to order the paper copy since I don't own a computer w a cd drive anymore.

Oil is fed into the rockshaft housing you can follow the pump piping to see where. From there its all internal. There are pressure reliefs in the valve itself plus you also have a system relief on top of the rockshaft housing. Pretty much under the seat by the SVC. You need to do a system pressure check. If the system relief was stuck open you hear it I would think.

Inside the valve you rebuilt was a long control spool its direction is hydraulically moved when you operate the lever to raise and lower the lift arms. It allows oil to flow in and out of the lift cylinder and also blocks oil release to maintain cylinder position. That's pretty much how it works. I'm also thinking maybe the spool cannot correctly move if the screw is to tight.. Back it out and see if the arms begin to sway. Seems to me even with some worn parts the rockshaft would still operate but probably not hold position if the control valve operation is correct

 

[DFB]

Here's the Directional valve assembly diagram from JD Parts. Search under sectional you can view all the hydraulic system components

 

[Gumby542]

So I got some troubleshooting detail. Details are:

Rockshaft will not lift and and system relief valve operates- isolation valve closed

Think I found tomorrow's test

 

[Gumby542]

So, I finally had some time to go out and spend some time today. The ROD screw can be moved either way with no change. I then tried playing with the set screw under it. Interesting result. The screw was completely broken. And the nut was held on basically by paint. My EZ out is at work, so I'll grab it tomorrow pull the set screw out and get a new one. Not sure if this will be my problem, but I'm sure it wasn't helping anything. Fix this and then go from there

 

[RG1]

If the set screw doesn't take care of it, I have another thing you can check. No use posting anything until you find out about the screw first though.

 

[Gumby542]

Update- the set screw did not cure the issue. I think I am hearing a pressure relief opening near the rockshaft valve. Sounds like the hiss from when you empty pressure from an air tank.

 

[Gumby542]

Also, the top lift arms can be picked up and dropped down with no resistance at all. Not sure if that is normal or not

 

[RG1]

When you got the tractor, was the rockshaft lever to the right of the seat still in place on the side of the trans, or did you have to re-install it?

 

[Gumby542]

I'm remembering it was off. 95% sure i had to put it back on

 

[Gumby542]

I'm remembering putting the pto selector lever and rockshaft height lever back on