B2650HSD with jerky transmission

check · Oct 7, 2017

Weimguy said:
Hello, did you ever get a resolution to your hydro static transmission that was jerky? I also have a B2650 that does this and it drives me nuts. I have had it to the dealer (October 2017) and they say it acts like all the other B2650's they have on the lot. Or at least one that they compared it to. They called Kubota technical support and they had no information for them. Like no one had ever complained about this issue. I feel like Kubota is hiding the fact they have ever had a complaint on this just telling me this jump or jerk in motion is normal. They are telling me to put it in low range every time I get close to something and don't want to risk crashing into it. My tractor does exactly like yours, in high range it is jumpy every single time. Medium range it jumps about half the time and in low range it's not very noticeable due to the heavy gear reduction. It's still there, just not as pronounced. My tractor is 2 years old and the warranty is just about to run out. It only has 62 hours on it. Does anyone have any updated information on this? Is there a fix? Do I have to get rid of this thing? I just don't think I'll ever be happy with it. Crashing into my brand new dump trailer and having a hard time swapping out implements because it's so jumpy is maddening. Any help with this would be MUCH appreciated!

Wow, will have to keep an eye on this thread. I was considering the possibility of a B2650, but now there is no way!

kuboman · Oct 7, 2017

My B3200 has done it since day 1. It seemed to be worse when I changed the oil and did not use Kubota UDT. I had a 2620 before and it was smooth as silk.

BubbaJr · Oct 7, 2017

I had a 2001 B2910 that jerked quite a lot in 3rd. Not as bad in2, and not at all in 1st. It had almost 1900 hours on it when I traded it for my new B2650 w/cab. My new one is at least twice as bad as my old one. I was used to it from my old one, but I think I'm going to have a talk with my dealer about this new one. Sometimes it will snap my head back.

Weimguy · Oct 30, 2017

check said:
Wow, will have to keep an eye on this thread. I was considering the possibility of a B2650, but now there is no way!

An update: The Kubota factory rep stopped by my house and drove my B2650 around the yard to see exactly what it is doing first hand. He does see what I am complaining about. He did agree that it would be a pain to have the tractor jump or lurch while in medium range doing loader work. He seemed very knowledgeable and said there are two spring valve assemblies (fwd & reverse) that they could adjust the spring pressures on. So they are ordering both assemblies and adjusting the spring pressures on them. When they are ready I can bring my machine in and they will install them and make sure it works like I want it to. He told me there is one possible drawback to doing this and that is when my foot is not on the fwd / reverse pedal the tractor may have a greater tendency to roll if on an incline. I am totally fine with that. I used to have a manual gear box tractor and you always had to apply the parking brake if you wanted to get off the machine. It's a good practice to get in the habit of anyway. So in the coming weeks I'll post how it all works.

Weimguy · Dec 9, 2017

Weimguy said:
An update: The Kubota factory rep stopped by my house and drove my B2650 around the yard to see exactly what it is doing first hand. He does see what I am complaining about. He did agree that it would be a pain to have the tractor jump or lurch while in medium range doing loader work. He seemed very knowledgeable and said there are two spring valve assemblies (fwd & reverse) that they could adjust the spring pressures on. So they are ordering both assemblies and adjusting the spring pressures on them. When they are ready I can bring my machine in and they will install them and make sure it works like I want it to. He told me there is one possible drawback to doing this and that is when my foot is not on the fwd / reverse pedal the tractor may have a greater tendency to roll if on an incline. I am totally fine with that. I used to have a manual gear box tractor and you always had to apply the parking brake if you wanted to get off the machine. It's a good practice to get in the habit of anyway. So in the coming weeks I'll post how it all works.

Great news!! My Kubota dealer here in Lynden Washington changed out a couple springs on some valves in the transmission and now my transmission is smooth as glass. It's so much better. So my issue has been resolved.