B2920 HST Creaking Sound

[trum979]

I had been thinking about trading my BX25 in this fall for a 2620. But after reading this tread, I am beginning to become a little more hesitant until this issue is resolved. I can't imagine having to listen to that sound while working with my tractor. It kinda sounds to me like a chattering relief valvue. Will be really interested to see if anyone finds the cause of this chattering and if there is a way to resolve it.

 

[e171fish]

BrierPatch Do you feel that your tractor rolls easier than it should when on a slope?

No. Seems to be fine.

Chriscos 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?

Yes, it makes the noise at full RPM with the pedal down.

I've tried to live with the noise for a few weeks now. When mowing it's not noticeable in low on flat ground. Going uphill the noise begins. Forget about mowing in medium.

I dug a 100ft trench and a large flower bed out yesterday. The chattering when using the FEL to scoop and transport dirt on level ground in low was extremely annoying. I could live with the chattering if it only occurred when being worked hard.

My BX2200 and BX2360 were both smooth running machines that tackled the same terrain without an issue. I'm not sure if my expectations are too high but it's to the point that I don't even enjoy using the B2920.

I was hoping this would be my last tractor.

 

[chriscos]

My hearing is shot, and my laptop speakers are horrible, and maybe I am missing some other sound on the videos, but I seem to be hearing "normal" HST whine when there is some load on the HST. Of course, it doesn't look like you have any load in the video...

Grasping at straws here, but...

Have you checked your Hydro fluid, make sure the parking break is not set, make sure one of the wheels aren't partially locked up with a brake-snafu?

I'd take it to the dealer or have them come and get it.

 

[skspurling]

I've had my B2620 since March, and mine makes that noise. After working around skid steer equipment, I don't think it's an odd noise. In fact, an easy way to make my tractor make that Noise is to get going really fast and then let off the forward pedal. It's just like when you are driving a bobcat hard like down a hill (not a really steep one :laughing, you will get that same noise as the pressure tries to keep up with the motion of the loader.

Maybe they left off or adjusted a limiter differently, or changed valve makers. It really doesn't sound any different than any other hydraulic drive equipment I have been around in the past. It's like an oscillation that sets up in the hydraulic drive system when the pump or the motor don't match flow rates and the pump becomes over run/under run. I've heard it in all kinds of stuff, so I didn't think anything of it when I heard my tractor make the same noise.

Oh, and mine has just a slight creep. It holds pretty good for an HST.

 

[OrangeRidge]

Doesn't ANYONE have a B##20 WSM ?
The by-pass valve needs a thicker shim to increase
the by-pass pressure slightly. This is an adjustment
problem at manufacture IMHO.

 

[chriscos]

Doesn't ANYONE have a B##20 WSM ?
The by-pass valve needs a thicker shim to increase
the by-pass pressure slightly. This is an adjustment
problem at manufacture IMHO.

I have the service manual, but if it needs a thicker shim then the dealer should be doing it under warranty, no?

 

[EE_Bota]

I don't have a B. I have a BX.
But my first impression, just comparing the noise to noises I have heard in hydraulics, I was reminded of oil going through metallic tubing and setting up a sympathetic vibration in the tubing itself.

 

[OrangeRidge]

... the dealer should be doing it under warranty, no?

The problem with that is nobody will want to pay . Kubota
won't be doing a recall and the dealer will play-thick ( that's the usual
game in the auto industry) and say "It sounds normal to me" ,( wood duck).

Could you post-up the valve page from your WSM please ?

 

[rswyan]

Time for an update. I loosened the keeper clamp on the drive shaft cover and slid it back. I lubed the shaft and u-joint, and put the cover back on. Whatever sound guys in earlier threads attributed to that cover, it is not the source of this particular chattering.

It may not be strictly a lubrication issue ..... but a position or orientation issue ...

The drive shaft cover is fairly stiff molded plastic (on my B2910 anyways) .... it appears to have a particular angle molded into it .......... just thinking here:

...... molded angle .... rotating shaft .... hmmm ....

Wonder what happens ...... if the shaft cover (with the molded angle in it) rotates out of what is the normal (correct) orientation ?

Reason why I bring this up is that I have been listening to a rather annoying "creaking" (squealing) noise myself for the last several hundred hours on my B2910 ......

Tonight I checked it out and found that it only makes the noise when it is not in 4WD.

So got underneath it and loosened the clamp and slip back the plastic shaft cover as far as I could (couple inches) and squirted some chain lube up there in the large open end at the front ... and squirted some on the shaft at the rear and watched it run down into the cover ..... then I worked the cover back and forth .... and noticed that it would rotate to some degree (mebbe 45 degrees ?) around the shaft.

At any rate I didn't think much more about it, and I positioned the cover in what I thought was the correct orientation and tightened the clamp up.

And then took it out for a test drive ..... the noise was completely gone .... not even a hint :thumbsup: ..... and it was a really loud and very annoying noise.

Point is, by virtue of being placed around a rotating shaft, the cover is probably inclined to rotate to some degree (mine was slathered, on the outside at least, with hydraulic fuild) .... maybe over time it rotates to the maximum point it easily can ...... and then binds due to the angle molded into it ....

 

[bp fick]

It may not be strictly a lubrication issue ..... but a position or orientation issue ...

The drive shaft cover is fairly stiff molded plastic (on my B2910 anyways) .... it appears to have a particular angle molded into it .......... just thinking here:

...... molded angle .... rotating shaft .... hmmm ....

Wonder what happens ...... if the shaft cover (with the molded angle in it) rotates out of what is the normal (correct) orientation ?

Reason why I bring this up is that I have been listening to a rather annoying "creaking" (squealing) noise myself for the last several hundred hours on my B2910 ......

Tonight I checked it out and found that it only makes the noise when it is not in 4WD.

So got underneath it and loosened the clamp and slip back the plastic shaft cover as far as I could (couple inches) and squirted some chain lube up there in the large open end at the front ... and squirted some on the shaft at the rear and watched it run down into the cover ..... then I worked the cover back and forth .... and noticed that it would rotate to some degree (mebbe 45 degrees ?) around the shaft.

At any rate I didn't think much more about it, and I positioned the cover in what I thought was the correct orientation and tightened the clamp up.

And then took it out for a test drive ..... the noise was completely gone .... not even a hint :thumbsup: ..... and it was a really loud and very annoying noise.

Point is, by virtue of being placed around a rotating shaft, the cover is probably inclined to rotate to some degree (mine was slathered, on the outside at least, with hydraulic fuild) .... maybe over time it rotates to the maximum point it easily can ...... and then binds due to the angle molded into it ....

I can believe this drive shaft shroud-cover could be a source of noise in some situations. It would, as you say, only happen when the FWD is activated. A badly adjusted relief valve in the HST would sound off in 2 wheel drive. So, someone with this other clatter/chatter noise will have to post once they've actually had the dealer fix the issue, or post once they've fixed it themselves.