b2910 hyd. noise in high gear: Kubota Review  -- Kubota Tractors Discussion Forum and Review b2910 hyd. noise in high gear: Kubota Review -- Kubota Tractors Discussion Forum

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 11-11-2004, 10:09 Post: 100199
ampebob



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 b2910 hyd. noise in high gear

Thanks for all the previous ideas posted on plowing snow! I ordered chains for the rear.
When in High gear,on a flat paved road or going down hill at about 3/4 throttle, I frequently get kind of a scream or ringing from what sounds like the front axle housing. Any ideas on what might be the cause? Do any of you know if the noise is a problem.
Bob Brown






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 11-11-2004, 11:24 Post: 100204
AV8R



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 b2910 hyd. noise in high gear

Is the 4wd engaged? There will be some gear noise from the slight mismatch of rotation when moving quickly.

If not, check for play in the front drive shaft support bearings (in axle and trans). It may have some play there.






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 11-11-2004, 12:02 Post: 100208
beagle

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 b2910 hyd. noise in high gear

My 7800 has the sam drivetrain and I don't recognize the noise you are descibing, so I would be a little concerned. How many hours do you have on the machine? Have you checked the front axle fluid level? The noise you descibe sure does sound like bearing noise, but are you sure it isn't the hydro whine. I certainly have more hydro whine in high gear than in either of the other two ranges, which is normal.






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 11-11-2004, 13:37 Post: 100215
ampebob



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 b2910 hyd. noise in high gear

Well I never run 4 wheel in high gear. The front housing is filled with UDT/ my dealer. Let me explain some more. When on flat paved road the noise begins after the machine (in high gear)reaches speed (rpm~2200). If I reduce speed, slow down say to 1000rpm the noise stops. If I stop and put the machine in mid range and run the same (2200rpm) no noise. If I go down a steep slope in high `1500 rpm the noise is back.
Could it be hydraulic cavitation? This could be hazardous to the pump system.






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 11-11-2004, 13:40 Post: 100216
ampebob



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 b2910 hyd. noise in high gear

Sorry forgot--320 vey easy hours. This has occurred from the day I purchased the unit.
What is the nature of hydraulic whine?






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 11-11-2004, 14:23 Post: 100218
Art White



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 b2910 hyd. noise in high gear

I doubt that it is a hydraulic noise but gear noise. Can you isolate it from side to side or center? Do you have the ability to raise the tractor on jack stands on all four and run it in four wheel drive to get the noise? You have bevel gears on both sides of the tractor and a set of gears in the center. One set or the others are not quite machined right to cause this noise. You can run it in four wheel drive for this test as there would be no ground contact with the ground and tires to cause wrapping. If you could do that then the dealer will know exsactly where to go to solve the problem and you will know where they need to fix because of your work in isolating the problem.






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 11-11-2004, 14:26 Post: 100219
beagle

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 b2910 hyd. noise in high gear

Make sure you check the hydraulic fluid level and the hydrostat filter. You want to be sure the hydrostat charge pump isn't starving for fluid.

The whine is from the hydrostatic transmission which is a seperate closed circuit system form the rest of the tractor hydraulics. When you operate in a situation where the drive motor works against the drive pump, down hills for example, or in high range, where back pressure increases against the pump, the pump will start "complaining". There is also a pressure relief valve in the hydrostat that will protect the system if the pressure builds beyond the relief setting. You could be hearing some pressure relief.

The normal whine of a hydrostat is just the machine doing what it does, create fluid pressure and turn in into rotational enengy. There are losses in the system, some of which is vibrational, or the whining.

I've now shared the best expanation anyone has given me to the same question.






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 11-11-2004, 14:32 Post: 100220
beagle

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 b2910 hyd. noise in high gear

By the way, "squeeling" is almost always a pressure releif valve doing it's thing. If it squeels during normal use, you may have a relief valve setting in the hydrostat that needs adjustment.






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 11-11-2004, 15:03 Post: 100222
Billy

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 b2910 hyd. noise in high gear

Bob, could this sound be a more distinctive (higher pitch) whine when in high range? I know you said high gear but making sure you didn't mean high range.

All tractors I've been around make more of a whine when in high range. The faster you go, the more whine.


If it's still a screaming or ringing and coming from the front, it's not gear whine.






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 11-12-2004, 07:11 Post: 100256
ampebob



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 b2910 hyd. noise in high gear

Yes the noise only occurs in high range. It does not always happen and may start while just running along. Seems like it could be hydraulic/pressure valve related. The tranny is full.
Bob






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