L3400 3-point hitch adjustment

   / L3400 3-point hitch adjustment #31  
I spoke to the service manager again in the out of town Kubota dealership (I did not buy the tractor there) and he said he would have his tech do this adjustment for 180 dollars of shop time. He stated that Kubota would not pay a dime to them for this. I took him up on his offer and got on the waiting list (6 weeks) for this kind of non emergency work. He agreed with me that Kubota should pay under warranty for this, but they have refused. He was very apologetic over this, but I can't expect him to lose money on a job and he has no relationship with me to begin with. He said if we had bought the tractor there, they would have just done it to keep the customer happy. My selling dealer is not interested in my problem, and is in denial of it being a problem.

James K0UA
 
   / L3400 3-point hitch adjustment #32  
...he said he would have his tech do this adjustment for 180 dollars of shop time...
To me that seems like a very good price but after seeing what a fine job Sean did... if I still had a jerky hitch, I would try doing it myself.

Sean, was it pretty straight forward or was it harder then it looked?
 
   / L3400 3-point hitch adjustment
  • Thread Starter
#33  
That sounds like a pretty good price to me too, James. There's at least 3 hours of labour in there, plus some time adjusting. The only parts should be some sealant for the case cover, a few copper washers for the hydraulic banjo fittings (unless you anneal the old ones and re-use them) and maybe a little bit of oil. I'd say he's doing the job at his cost to encourage you to start using them for service and parts. Smart business.

As far as difficulty goes, it wasn't bad if you're mechanically inclined. Getting it apart is pretty easy with someplace clean, warm and dry to work, which I have.

Special tools really aren't needed, about the only things I used that the average owner might not have were the dial verniers and feeler gauges for measuring the valve settings.

I really have to thank the folks that provided the information I used to set the valve. They know who they are, I'm not going to mention any names since I doubt they want to be deluged with requests for information. If they want to volunteer to post it or provide it privately to interested folks, I'll leave that up to them.

I have a few tweaks left to do to get it just right. When you shut the engine down the 3-point settles very slightly, maybe an inch or so, which it didn't do before.
If I increase the set screw gap slightly it should eliminate that and still keep the lift smooth. That's going to be trial and error, with a minor change being followed by a re-assembly and test run. I set the gap at 0.006", which is in the middle of the tolerance of 0.004"-0.008". I expect to be at the high end of the limit or even slightly beyond to eliminate the settling. I could live with it, but since I already have it apart I might as well see if I can reduce or eliminate it while I'm at it. I also want to check the feedback rod setting in case that has an impact on it, but I doubt that will change much.

I have to rig up some sort of frame to set the top case back in place easily. My back is pretty good, but it's awkward holding that much weight at arm's length over the transmission. I think a block and tackle I have might be just the thing.

Overall, I'd say I'm pretty happy with the results I got. My time doesn't cost me anything and I learned from the experience. Thanks to some friends here the information to do the job was available too.

It'll be interesting to see if anybody else here takes the plunge and tackles their's. I had a few misgivings about it at first, particularly while it was still under warranty. Once I was into it, it went better than I thought it might have. I did end up removing the wiring harness from the right fender to get it all the way over to the left side and completely out of the way. If you have a helper to hold it to one side while you sit the case cover in place you might not have to do that, it took me about 5 minutes to remove it.

Sean
 
   / L3400 3-point hitch adjustment #34  
subscribed:thumbsup:

Nice job and nice write-up.

thanks for all the specs. I have thought many times about just tearing into mine to see what I can see. But without those specs I would have been lost.:confused2:

Maybe I'll tackle mine if I get some spare time in the next few months.
 
   / L3400 3-point hitch adjustment #35  
Sean - I don't have a 3400 but have followed that problem out of curiousity for a long time. I must say that your work made one of the most interesting and best done threads I have ever seen. Just like being right there looking over your shoulder.Thankyou for sharing.
 
   / L3400 3-point hitch adjustment #36  
I just had my 2011 3800 fixed and it works perfectly. I don't know if the dealer got reimbursed from Kubota...

This is a great thread and I am impressed with you Sean. Good work!
 
   / L3400 3-point hitch adjustment #37  
Great job, let us know how it does with some weight on there. That will be the game changer.

I also have the L 3400. I may need to start looking for a caliper and feeler gauges...
 
   / L3400 3-point hitch adjustment
  • Thread Starter
#38  
Thanks for the kind words guys, this has been a thorn in my side for long enough that I'd like for all of us here with these tractors to benefit in one way or another from the experience.

Today I tried some variations on the set screw adjustment to find the "sweet spot" with the best response and smoothest operation. All told there were about 8 different settings that I tried with varying results. I made a short spacer 0.630" long to put between the valve plate and body for more consistent measurements.

It seems like there isn't much difference between 0.006" - 0.016" gap, all have very smooth lift with a slight "settle" or "sag" when you shut down. I didn't try anything below that. The spec is for 0.004"-0.008" gap (0.1-0.2mm). Once you go above 0.020" gap things get interesting, however.

I tried going back to the original setting of 0.045 to see what would happen. Sure enough, the jerky action was back, but there was no settling of the hitch when you shut the engine down.

I reduced the setting to 0.030", and something I wasn't expecting happened. The hitch started cycling slowly up and down about an inch all by itself.

Reducing the setting to 0.026" made the cycling much worse, enough to actually shake the tractor with only a drawbar on the hitch arms. About 3-4 inches up and down fairly rapidly.

I tried going down to 0.020" and the hitch was close to being stable, a couple of minor oscillations then it stabilized for the most part. Right on the edge of acceptable, I think. It also settled about an inch after shutdown at this setting.

From this, I'm going to re-set the gap at 0.006"-0.008" tomorrow and re-assemble everything to try it for a while.

I can't understand why it would have been sent out from the factory with a setting of 0.045" unless it was a mistake. The WSM clearly explains how to set the valve, and it works well at that setting, so unless the factory is working to a different specification for some reason it's a mystery.

Sean
 
   / L3400 3-point hitch adjustment #39  
I can't understand why it would have been sent out from the factory with a setting of 0.045" unless it was a mistake.


You know I wonder if somehow it is a millimeter vs. standard thing. Spacecraft have been lost because someone screwed that up...

Just a thought.
 
   / L3400 3-point hitch adjustment #40  
It would be amazing if a Kubota factory rep saw the two videos and e pictures/ narrative in this thread and still deny a problem. The Kubota organization does a lot of good things right, but they seem to have a tin ear when it comes to acknowledging a chronic problem. I'm glad my hitch doesn't do this - my blood pressure is glad too :)
 

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