MX5100 Jerky 3pt hitch

[SPYDERLK]

Ok this thread had me concerned about my MX5100 gear model. So today I had to move some firewood on the carryall on the 3pt hitch. I checked the lift unloaded - smooth up and down. Then I loaded the carryall full - smooth up and down and could feather the lift without jerkiness. Still concerned so I checked the MX5700 and the MF 135 as a comparison - there was a noticeable difference but not a big difference.

It appears mine is not a jerky lift. Hearing that some are so jerky that the front wheels lift off the ground is disappointing, I thought Kubota would be better than that.

Esp after the problem has gone on for years and spread over several models. If I bought a new one that had it they would make good or be sued.
larry

 

[case245]

try to sue kubota you better have alot of money id sell the tractor before id try that it would be cheaper

 

[k0ua]

For you guys that have never seen one. here is an example. this is just a boom pole, now put 750 lbs on the 3pt and imagine what how much weight you have jerking around on there. My 2010 L3400HST was just like this.

https://www.youtube.com/watch?v=jSTJrL6AwYg

 

[k0ua]

Here is one that the owner says the dealer ordered a new valve (off of what is the question) and installed it. This is how they should look"

https://www.youtube.com/watch?v=sPUnz3SmOgQ

 

[SPYDERLK]

try to sue kubota you better have alot of money id sell the tractor before id try that it would be cheaper

... Example of why theyre getting away with it. ... How do you think they would defend?

 

[Chilly807]

Here are some videos of mine pre-fix, mid-fix, and just before the "fix" was abandoned and we went back to pre-fix settings..

No wonder I have a lot less hair than I used to.

Before the "fix"

Kubota L3400 3 point hitch - YouTube

During adjustment phase... there was dancing for joy at this point, I figured I had it nailed! All I did to accomplish this was to adjust the PCV to WSM specs. It was adjusted a long way from where the WSM says to set it, by the way.

Kubota L3400 3-point hitch after valve adjustment - YouTube

And the almost-final result..

Kubota L3400 with rear blade after 3 point valve adjustment - YouTube

This was shortly before I discovered that the 3pt was being held in position by a dynamic flow of oil in and out of the valve when it was supposed to be static. Any disruption in that flow, such as using the FEL or rear remote hydraulics such as angling the blade would drop the hitch an inch or two, then it would snap back up once you stopped using other hydraulics. Not acceptable, at least not to me. I changed the valve settings back to what it was originally. I first tried splitting the difference between factory settings and what the WSM recommended, but ended up with the 3pt "hunting" up and down by itself. Not good.

My conclusions? The factory is well aware that the WSM settings don't work, so they set it differently to make it usable. Left hand: "Hello? What's going on over there?" Right hand to foot: "Did you hear something?"

Sean

 

[crazyal]

I'm sure it's not as simple as tightening up the tolerances to make it smooth. It most likely would require retooling and engineering the design and then training employees on how to correctly fit and install the new valve. All of that costs money. For each piece they upgrade to the work like the GL line is just adding more to the price of the tractor. It's too bad Kubota can't find a solution for dealers to help the ones that just seam to be really bad.

 

[SPYDERLK]

I'm sure it's not as simple as tightening up the tolerances to make it smooth. It most likely would require retooling and engineering the design and then training employees on how to correctly fit and install the new valve. All of that costs money. For each piece they upgrade to the work like the GL line is just adding more to the price of the tractor. It's too bad Kubota can't find a solution for dealers to help the ones that just seam to be really bad.

It really isnt rocket science. The other companies solve it.

 

[3boys865]

I'm sure it's not as simple as tightening up the tolerances to make it smooth. It most likely would require retooling and engineering the design and then training employees on how to correctly fit and install the new valve. All of that costs money. For each piece they upgrade to the work like the GL line is just adding more to the price of the tractor. It's too bad Kubota can't find a solution for dealers to help the ones that just seam to be really bad.

To me, a smooth operating 3pt hitch should be standard expectation on ANY Kubota tractor. If they need to cut cost, cut it on something else. The 3pt hitch operation is a core function of the tractor and should not be a place to cut corners. From an engineering and manufacturing stand point, I can't for the life of me understand how the "accepted tolerance level" for the operation of the 3pt hitch could possibly be that wide. Anything from smooth to bouncing the tractor is "acceptable for that model" according to Kubota. How can it be left up to chance as to which one you get? The MX5100 is not a cheap tractor, the configuration I purchased retailed for $30K. A $30K tractor should not have a "tolerance" for manufacturing or design that includes a jerky 3 pt hitch period.

 

[Don87]

I read the threads on the 'jerky 3pt. And if memory serves me correctly, someone fixed the problem completely by replacing the valve with one from the Grand L series.

It seems that I remember everyone skipping over his post at that time.