Green Tractor Talk banner

Rockshaft not working on 4100

10916 Views 10 Replies 2 Participants Last post by  Kennyd
Ok, this is on a 4100HST 4x4 with FEL all factory.

Alright, so while hooking up my aux hydraulic spool I needed to raise the three point to put in the new hydro top link. The hydros were all disconnected and so I placed the lever in the highest position and then placed a jack underneath the attachment I had on it so I could move it the inch I needed to get the pin out. Well. I got it all back together and tried to lift it. Nada. Hydros aren't dead headed and all the other functions work well ie (steering and fel)

So here's what I did to troubleshoot.

1. Checked for dead heading as sometimes happens if the aux's aren't plumbed correctly. No issue, the tractor's not bogged down and other functions ok.

2. Checked that the lowering speed adjuster was in the open position and the lever for height adjustment lever moves through the range. A little sticky, but it works ok.

3. I reinstalled the oem pb kit to see if it was a flow issue. No change.

4. I went ahead and removed the rockshaft assembly and inspected for mechanical damage. None seen. checked the linkages, etc and hadn't noticed any physical damage etc. When reassembling I noticed the control valve for the rockshafts relief valve was jambed in the plate it rests in. The plate was slightly ascew so I loosened the three screws that hold it in and it was still off so I smoother out the hole a little so it would rest in it like shown in the manual. Reassembled and no change.

5. Removed control valve again and completely disassembled it figuring it may have some debris in it since it's supposed to be the last in line to receive fluid and it may have gotten something in it since I installed many new components. Didn't see anything and it appears all the valves in the control move like they're supposed to.

6. While the control valve is out of the rock shaft assembly I blew through the return line on the aux hydros and did see flow from the return port inside the rock shaft housing for what it's worth.

I did notice that if you use the fel to the point it starts to bypass and then let off really quick it'll make the rock shaft move up about an inch. It does this consistently. It will lower correctly when ordered to.

I'm beginning to wonder if I didn't tweak the eccentric shaft(or inside levers) that the control lever is mounted to causing the control lever to not engage the control valve spool enough to raise the rock shaft.

I guess I should have checked the engagement of the actuating mechanism with the control valve installed in the rock shaft when I had it out.

Anyone encounter something like this?
See less See more
1 - 4 of 11 Posts
Wow, quite a story SQ...lets try to break this down into small pieces to get this figured out.

Alright, so while hooking up my aux hydraulic spool I needed to raise the three point to put in the new hydro top link. The hydros were all disconnected and so I placed the lever in the highest position and then placed a jack underneath the attachment I had on it so I could move it the inch I needed to get the pin out. Well. I got it all back together and tried to lift it. Nada. Hydros aren't dead headed and all the other functions work well ie (steering and fel)
What valve did you use? With or without PB plug?

3. I reinstalled the oem pb kit to see if it was a flow issue. No change.
Was this PB kit already installed on your tractor, or did you add this as part of the spool install project? If you just added this, then I know what the problem is...

Answer these then we will continue please. And I moved this to the Hydraulics forum, seems to fit better there.
4
Diagram Text Design Parallel Technical drawing
Auto part Text Diagram Line Automotive engine part
Diagram Text Auto part Technical drawing Plan
Text Auto part Diagram Design Line


Here are all the related pictures from JDP.

The set screw that re routes the fluid to the PB was installed when I installed the PB kit. I think that's what you were thinking:wink: Wonder if it came loose though? I know I torqued on it.
Yes, that is exactly what I was thinking-hoping really for you! I know it burned me when I installed my PB kit, and I have seen and helped many others who have done the same thing.

I am struggling to find any more suggestions:think: I am trying to relate how jacking up the implement would cause this problem and drawing a blank.:banghead:

I know this is stupid but are you sure one of the hoses is not binding the linkage? I know it's tight in there...


I did notice that if you use the fel to the point it starts to bypass and then let off really quick it'll make the rock shaft move up about an inch. It does this consistently. It will lower correctly when ordered to.
This has me confused as well, that is a symptom of a valve in parallel and not in series.
See less See more
Sounds like you have a good handle on it SQ, let me know if I can help in any way...
Wow, what a story! Your persistance certainly paid off!
  • Like
Reactions: 1
1 - 4 of 11 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top