Still have jerk in hydro: Kubota Review  -- Kubota Tractors Discussion Forum and Review Still have jerk in hydro: Kubota Review -- Kubota Tractors Discussion Forum

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 11-13-2000, 21:02 Post: 21476
Duane Pearl



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 Still have jerk in hydro

I posted a message a week or so ago about a "jerk" or a "surge" in the hydrostatic transmission of my Kubota B7500 HST. I took the tractor up to my dealer, who up to this point as been very good to me. At first they thought it was because the tranny was a little low on oil, which was their fault for not filling it up when I bought it. But that wasn't the case anyways. Even after filling it up, the tranny still wasn't smooth. They then got a little reluctant to even try and figure out what was wrong with it. They told me that whatever was causing the problem could probably only be fixed by tearing the whole transaxle apart, and that the problem probably wasn't really hurting anything. They told me to wait until I get 50 hours on the tractor, change all my fluids, and then see if the problem still persists. I thought that was kind of a cheap way out myself, but I went along with it for now. I sure would like it to work properly, as I spent alot of my hard earned money on this tractor, and money is something I do not posess in excess amounts. Let me describe the "jerk" once more, and see if anyone knows wnat it could be. As you press the pedal down, either to go forward or backward, the tractor will beging to just creep, when all of a sudden it lunges forward and the pedal gets stiff and kind of pushes back at my foot. If you continue to press the pedal down, it seems to operate smoothly. It's almost as if whatever valve the pedal is opening is not opening smoothly. It does this regardless of engine rpm, but only in high range. I wonder if it's doing it in low range, but is not noticeable because of the drastic gear reduction. If anyone could help, I would be greatful. Maybe if I could help my dealer figure out what is wrong, they would fix it for me. thanks.






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 11-13-2000, 22:45 Post: 21480
Gerald Pritchett



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 Still have jerk in hydro

Duane,
My B2910 acted just as you describe. It bothered me too.
I got about the same story from my dealer as you did. Not to
stop there I called the regional Kubota rep. I was told that
what you feel is the anti-creep valve closing. It will open and
close going down hill too. Any time the pressure drops below it's
setting. After you play with it a while you can feel it close
every time the hydro has to work a little harder. In low range
I could not feel it at all, middle range a little, high range
all the time. I drove a new B7500, it did the same thing.
I was also told that it could be adjusted, but it would be more
prone to creep at a stop. It worked OK so I didn't pursue it any
further.
After the 50 hr. service it worked the same, no change.
This must be something new that has been added, no one with the
older Bs have complained about it, that I have heard of.
I may not have be told the whole story about the valve,seems like
it had more torque before the valve closed. maybe a way to get the
tractor rolling easier. I don't think it's a problem, it's just the
way they work.






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 11-13-2000, 23:13 Post: 21482
Bird Senter

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 Still have jerk in hydro

Duane & Gerald, I'm no mechanic, but I've had a 1995 B7100 and now have a 1999 B2710 and I've never felt any such "jerk" and just can't believe it's normal. I don't believe I could tolerate that.






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 11-14-2000, 21:27 Post: 21508
Duane Pearl



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 Still have jerk in hydro

Gerald, I was wondering if the adjustment you speak of is in the valve itself, or in the linkage. I got an e-mail from someone talking about adjusting the linkage so that you don't notice this jerky feeling. From what I can see, this is not a problem that only I am having. There are others who are experiencing this same jerk. Is there a design flaw in the valving system? Or a manufacturing problem that is putting out bad or mal-adjusted valves? Or are they jusdt supposed to be that way. I know for a fact that when I test drove a B2410 that I did not feel any such jerk... it was just as smooth as could be. I expected the same from a B7500, and I am hesitant to believe that "that's just the way they are." I realize that it probably won't hurt anything, but I did spend alot of money for this tractor, and I sure would like to be certain that everything is ok. I sent some email regarding the situation to Kubota Corp., but no reply as of yet. I don't want to push the issue with my dealer, they have been good to me, so I am trying to become as informed as I can before I confront them again.






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 11-14-2000, 22:08 Post: 21511
KlayW in MI



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 Still have jerk in hydro

Hey DP, is the "surge" most noticable after a stop then a range change? I too have felt this "jerk" on my B2710. I mostly notice it when going from forward to reverse or visy versa after I change ranges in the transmission and mostly from high to low range just after starting to move. The difficult part is that in 30 hours of use I have felt it about only 5 times! I would describe it like this; from a dead stop selecting the range then I start moving sllooooowww, traveling about 2 to 5 inches the trans will jerk to a slightly differant (just noticable) speed with no change in the pedal. I have never felt the jerk when accelerating quickly. Sound like anything you felt?






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 11-14-2000, 23:19 Post: 21514
Gerald Pritchett



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 Still have jerk in hydro

Duane,
I did not discuss what valve could be adjusted, but I think I would let Kubota
or a Kubota dealer decide what needs to be done to your tractor. Like I said
we may not know all it does. For instance, the cruise worked real good,it
maintained the set cruise speed better than my L3010HST, and I could feel the
valve open and close going up and down hills in medium range cutting grass.
Bleeding some of the pressure may have fixed other problems, never heard
of a B with the "power steering loss" problem and the "jerk" problem.
I'm just thinking out loud on this subject. Don't take anything I say to
the bank. I'm just a tinker that likes tractors. If your not satisfied with
your tractor, drive a L3010HST, it has the "Feather step" HST, a different
machine than the HSD.









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 11-15-2000, 07:26 Post: 21519
Art White



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 Still have jerk in hydro

I've been watching this post and with interest, Take the tractor to the shop and tell them to fix it or give you a tractor that doesn't have the "jerk". It could be a safety issue if not resolved. There are not two identical mechanical things ever built but a jerk in the drive line is unacceptable to me as a Kubota dealer and I would get to the bottom of it. Often times you may have a little different noise from a machine do to the gear lash which is nearly impossible to find and we have to pass on being able to find it but a jerk in the drive train is not right. The life of the parts involved very well will have no difference in life but to adjust or replace that valve is just the proper way to fix it. A thought on the low oil. Had a customer who was getting ready to hook up his new tractor to his plow, had to change hydraulic ends on it and when he put it in the coupler he left it there but got side tracked and had to do something else. Son fresh of the school bus see's dads new tractor sitting there running hops up on goes for ride out back and of coarse playing with the levers finds by moving one lever it will squirt oil 30 feet out the back! Wow was it fun while son gets the tractor back to the plow but dad can't raise the plow due to lack of oil! What a call from this guy, he was hot and I couldn't blame him I was to, 45 minutes later my mechanic is at the farm and can't figure out where 20 gallons of transmission fluid went when the little boy shows up and talks about the oil gun on dads new tractor. It just isn't always the dealers fault!






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 11-15-2000, 09:01 Post: 21523
Roger L.



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 Still have jerk in hydro

Art, thanks for writing that piece of advice. It is particularly valuable coming from your perspective. When I started reading this thread the thing that stuck in my mind was Duane saying:
"Maybe if I could help my dealer figure out what is wrong, they would fix it for me. thanks."
After I read that sentence I suddenly felt tired and defeated by all the dealers out there who just don't care. Maybe is is because of my own experiences as an old time mechanic and repair shop owner. Your common sense answer makes my day! Smile






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 11-15-2000, 16:28 Post: 21526
Duane Pearl



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 Still have jerk in hydro

Art... I am sorry if I offended you with the "it was the dealer's fault" line. You are right in saying that it's not always thier fault. Even if it wasn't filled up from the dealership I should have taken the responsibility, and had enough common sense to check the oil level myself. Sincerest apologies on that. Now to the matter. I must say that during the purchase of my new kubota, that my dealer was just simply great, and I am not sure that they are anything less than that now. I perhaps am just a little too easy going. I don't like confrontation, and I like getting along with people. I am afraid of pissing them off, and then finding myself in perhaps an urgent set of circumstances where they just blow me off. If you think this problem with my tractor is big enough to get a little pushy, then I will just have my wife call them. Smile I sure would like to hear back from Kubota on this... I am not even sure that I sent my email to the right place. Can someone post the correct email address for me? Also, the jerk is indeed noticeable in low range, but only when there is a load on the tractor. (ie pulling a box scraper)






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 11-15-2000, 19:19 Post: 21528
Duane Pearl



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 Still have jerk in hydro

Do you guys think I should give my dealer the benefit of the doubt and wait until I get 50 hrs on the tractor and change all the fluids? I seriously doubt the problem will be solved by the changing of all the fluids, and if I wait intil 50 hours I will be waiting quite a while. I just won't use the tractor that much this winter unless it snows like crazy. Also, I was wondering what kind of safety concern you are talking about Art. I mean, the jerk isn't enough to knock me off the tractor or anything, just enough to irritate me and make me ask questions.






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Discussion Boards > Active Subjects > Messages as Posted > Kubota Review Forum

Thread 21476 Filter by Poster:
Art White 4 | Bird Senter 1 | Duane Pearl 7 | Gerald Pritchett 2 | KlayW in MI 1 | kthompson 1 | Roger L. 1 | weimguy 3 |

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