Jerky LSeries 3pt Hitch Fixed

[k0ua]

Progress. Now let's find someone else with and L3800 and a smooth hitch to corroborate...

I don't recall hearing about jerky L4400's either but always figured it was more to do with the cylinder size.

If all those part numbers are accurate then one might consider that an admission from Kubota that they have a performance problem and a good faith effort to fix it. My valve part number is pre to those and still an upgrade. Maybe the fix is finally here.

Yes and notice the "old" valve part number previously used in L3400 is now used in Mx5100

YR908-104 - used in MX5100

This lends some credence to the "adjustment" angle of this. Jeez. if it was this easy would not Kubota just issue a bulletin and dealers would be fixing this problem all day long? This is hard to understand.. yes need more input. more from Mx5100 and L4400 owners. And what are we to make of Messicks statements. Geez. there are thousands of posts. on this here. I will assure anyone who would listen that the video Chilly807 posted is exactly the way my 2010 L3400HST operates Exactly. I dont own a box blade, nor heaven forbid a boom pole. but the boom pole for sure would be a total wash out. No real problem using my mower just overshoot to where you want it and feather down and the position control keeps it there. The ballast is either up or down. no problem. Come on MX5100 and L4400 owners, help us figure this out. The more stats we can gather, the closer we can come to understanding this.. And could someone near Seattle go and find this Jerry the mechanic guy, and get his butt up on line? and take the stand and start spilling his guts.:laughing:

James K0UA

 

[jokergerm]

Still waiting for the video of thls dealer with smooth L series hitchs

 

[jokergerm]

Update: sales rep talked to another guy who helped on mt tractor and there is a adjustment screw in the proportioning valve for the 3pt hitch that can be adujsted and it really effects the performance of the three point hitch it self.

The guy who got fired did not know this i guess and thats why he ordered a new valve and installed it and the new valve did the same thing, so they torn it apart and the other mechainc told him about the adjustment screw and it fixed it


Not sure if this helps or not but i thought i would pass it along, someone with some balls needs to dig into there L series and go fishing!!

 

[jokergerm]

Interesting

 

[teg]

...the other mechainc told him about the adjustment screw and it fixed it ... Not sure if this helps or not...

Tell that smart mechanic to look at this thread!!! We have questions for him!!! ...and joker, thanks for your effort and time! :thumbsup:

 

[johnrex62]

Update: sales rep talked to another guy who helped on mt tractor and there is a adjustment screw in the proportioning valve for the 3pt hitch that can be adujsted and it really effects the performance of the three point hitch it self.

The guy who got fired did not know this i guess and thats why he ordered a new valve and installed it and the new valve did the same thing, so they torn it apart and the other mechainc told him about the adjustment screw and it fixed it
!

Does this mean I have to pull Terry's name out of the song? That will be extra! :laughing:

 

[Leejohn]

On a MX5000 there is a regulator valve for the 3pt and the power steering with a adusting screw and I bet this what is being adjusted. Giving more flow to the steering and taking away some flow to the 3pt.
I don't have the parts brake down for the MX5100, but I would guess they are the same. The 3pt must be getting way to much flow, more then the valve can handle so it's fast, that is making it jump up.
Now the big ?? is how to adust it. That should me in the service manual some where, maybe under the steering section. See if this helps to find a fix or get headed to a fix.
PS there is not a adustment on the 3pt valve just a relief valve.

 

[rswyan]

Update: sales rep talked to another guy who helped on mt tractor and there is a adjustment screw in the proportioning valve for the 3pt hitch that can be adujsted and it really effects the performance of the three point hitch it self.

The guy who got fired did not know this i guess and thats why he ordered a new valve and installed it and the new valve did the same thing, so they torn it apart and the other mechainc told him about the adjustment screw and it fixed it


Not sure if this helps or not but i thought i would pass it along .....

Sounds like a bit of possibly very relevant info to me .... thanks for pursuing it and passing it along :thumbsup:

 

[Harvest Moon]

On a MX5000 there is a regulator valve for the 3pt and the power steering with a adusting screw and I bet this what is being adjusted. Giving more flow to the steering and taking away some flow to the 3pt.
I don't have the parts brake down for the MX5100, but I would guess they are the same. The 3pt must be getting way to much flow, more then the valve can handle so it's fast, that is making it jump up.
Now the big ?? is how to adust it. That should me in the service manual some where, maybe under the steering section. See if this helps to find a fix or get headed to a fix.
PS there is not a adustment on the 3pt valve just a relief valve.

Thanks for the suggestion. Not sure it will work on an L3400. It looks like steering and 3 point are separate systems, each with their own separate hydraulic pump and relief valve.

 

[TheGoose]

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