B2920 HST Creaking Sound

[BrierPatch]

Thanks BP. Appreciate your help and troubleshooting on this.

Good Job ! :thumbsup:

 

[Creek44]

My opinion of the offending noise after 100hrs of use has been that it is of HST origin and that it is a normally abnormal manifestation of this particular model.

 

[jambx]

Your U-Tube was great - made me feel I was not alone - I am at 140 hours and the exact noise is still there most when under load - I have never been able to isolate it - since other owners too hear this sound I am begining to think its just normal HST whine for the 2X20's

When I think back to my origional BX22 - that baby just purred at all speeds when compared to this B - although I a still very happy with this platform.

Here was my thread back in 2009;

http://www.tractorbynet.com/forums/kubota-owning-operating/145409-b2920-vibration-under-load.html

 

[bstrom]

I've got a 2008 B2620 with around 240 hrs on it. I've used it pretty hard at times and never noticed this noise so I don't think it's normal I'm sorry to say. The only thing I did maybe different than normal is change the HST oil at around 50 to 60 hrs but I doubt that's it. I also did not run it fast or hard the first 50 hrs but I'm sure most people do that I guess.

Also mine does not roll easily on slopes, especially in 4 wheel drive. What about something wrong with the diff lock or the L-M-H gearing or clutch adjustment? I don't know what, just wild guessing because it's a clattering sound.

 

[bp fick]

Even if, if it is "normal" under heavy load, how can it be normal when just driving around? Nope. Not ready to accept that such a ratcheting racket is normal with the OP just driving around. $.02

 

[BrierPatch]

I've got a 2008 B2620 with around 240 hrs on it. I've used it pretty hard at times and never noticed this noise so I don't think it's normal I'm sorry to say. The only thing I did maybe different than normal is change the HST oil at around 50 to 60 hrs but I doubt that's it. I also did not run it fast or hard the first 50 hrs but I'm sure most people do that I guess.

Also mine does not roll easily on slopes, especially in 4 wheel drive. What about something wrong with the diff lock or the L-M-H gearing or clutch adjustment? I don't know what, just wild guessing because it's a clattering sound.

I was concerned enough about mine that instead of doing the 50 hr service myself I had the dealer do it so there was no chance of it being something I did. However this is when I was unable to convince them of the problem also.:confused2: I also tried to break it in by not running it hard or constant speed/rpm for extended periods and not running it full throttle.

 

[donn12]

I am pretty sure mine makes a similar noise when in high gear but I do not use high very often. I have always thought it was normal.

 

[wowwee]

I have a B2320, it makes the same noise. I have 60 hours on it now. I never noticed the noise until a few months ago when moving snow. Noise only happens under load, doesn't always have to be a heavy load. First time I heard it I immediatly thought it sounded like a hydrostatic transmission noise. Hope it stays the same for another 3000 hours, or even better, self destruct while it's in warranty.

Dale

 

[chriscos]

i have a 2920. Mine makes the same noise when I have the rpms set too low, or I am pushing into a huge pile, but I don't seem to recall it making this noise "normally", or better yet, it doesn't make that sound when I don't expect it to.

To me, it sounds like my HST when I am "bogging it", For example, if I have the RPM set too low.

Did you have the go pedal all the way down in the second video? Does it make that noise with the go pedal all the way down at full RPM?

It might not be pressure relief, but instead, the sound of the fluid going through valves that are not open all of the way?

I'll experiment some more, but one thing to keep in mind, if you are running at full RPMs you might as well press that pedal to the floor, since you are burning the fuel anyway

I don't like to run at full throttle if I don't have to.. and now that I think about it, I make my gear/RPM choice based on not having to hear that sound.

My $0.02...

 

[ackerrj]

i have a 2920. Mine makes the same noise when I have the rpms set too low, or I am pushing into a huge pile, but I don't seem to recall it making this noise "normally", or better yet, it doesn't make that sound when I don't expect it to.

To me, it sounds like my HST when I am "bogging it", For example, if I have the RPM set too low.

Did you have the go pedal all the way down in the second video? Does it make that noise with the go pedal all the way down at full RPM?

It might not be pressure relief, but instead, the sound of the fluid going through valves that are not open all of the way?

I'll experiment some more, but one thing to keep in mind, if you are running at full RPMs you might as well press that pedal to the floor, since you are burning the fuel anyway

I don't like to run at full throttle if I don't have to.. and now that I think about it, I make my gear/RPM choice based on not having to hear that sound.

My $0.02...

I have a B2320 with 13 hrs on it that does not make that noise even under load. Your noise does sound like a vibrating heat shield. I have run mine at 2600 rpm with a 400 lb king kutter rotary mower, no unusual noises. Also under heavy load doing subsoiling. The noise there sounded like hydraulic fluid under pressure, kind of a wooshing noise. Dealer assured me this was normal HST noise under load.