BX relief lifting: Kubota Review  -- Kubota Tractors Discussion Forum and Review BX relief lifting: Kubota Review -- Kubota Tractors Discussion Forum

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 02-14-2007, 16:21 Post: 139752
botamac

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 BX relief lifting

Today I was plowing my driveway with my BX 23 and I noticed after I was done That when I shifted to high gear to head back the the barn that the trans made a shuttering sound, like the relief valve was lifting. The Trans fluid level is okay up to level. The parking brake was not on. The sound only heard when I take off from a stop it’s not a metal sound, it sounds like the relief is lifting. Anyone have any thoughts on this before I send off to the dealer to have them check it out. So Sad






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 02-14-2007, 16:30 Post: 139753
Murf

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 BX relief lifting

First off, I'm not sure what you mean by the relief valve "lifting", do you mean opening?

The weather in Michigan hasn't exactly been balmy the last little while, it is possible that the hydraulic fluid was still so cold, even after working a bit, that it was thicker than it should be. This would certainly put some real pressure to the system under a big load like starting off in high range, especially if you were in a hurry to get back in front of the fireplace. Smile

Best of luck.






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 02-15-2007, 11:29 Post: 139768
botamac

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 BX relief lifting

Yes it is opening. And the oil is warm first the tractor is stored in a heated barn and I start it and let it run for about 15 min. when I brought the tractor back to the barn after using it for about 2 hours and shut it down the oil in the trans was warm not hot but warm. I don’t know if there is an adjustment or something got past the filter or may the relief spring is weak or out of adjustment. I’ll go home today and start it up and see if it does the same thing. Then I’ll make a decision from there.






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 02-15-2007, 14:47 Post: 139772
Murf

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 BX relief lifting

Ok, now a few blanks are filled in.

First of all, the relief valve will open under a sudden full-load start or in high range, even when the fluid is warm.

The type of drive system in hydrostat's like this need to build up to speed, you can't just push and go, you have to be a little patient and let it slowly gain speed. This type of drive system uses a variable displacement pump. In other words, the farther down you push the pedal, the higher the displacement (the more fluid) the pump moves. The problem is however, that the drive motor is directly coupled to the wheels and can only consume fluid at a certain rate, namely the displacement per revolution of the motor, times the number of revolutions per minute the motor is turning.

In the end, if you try to pump twice as much fluid as the motor can accept, the relief valve will open to dump the excess volume straight back into the reservoir.

I suspect this is what is happening.

If there was a problem with the relief valve itself, it wouldn't change depending on what range you were in, it would be the same all the time.

Best of luck.






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 02-15-2007, 23:02 Post: 139790
earthwrks

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 BX relief lifting

My blue does this too. If it's nice and warm out you likely wouldn't be hearing as much of the hydro being taxed. Instead, you'd take notice of the engine lugging. Both are indications of the wrong range (too high) or not high enough RPM to compensate. Most likely the go-pedal is hard to push down too---this goes back to Murf's eloquent disertation of displacement versus RPM.
Now, if you use the lowest range and press down on the go-pedal, there will be little or no resistance.






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 02-16-2007, 09:11 Post: 139793
botamac

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 BX relief lifting

Yesterday I hooked up the rear 5’ blade to remove the hard pack off the drive way and in the past the tractor had no problem doing this.I had it in 4 wheel low range and in the past it had no problem. Yesterday I did this and would get about 10’ and the relief would open so I would raise the rear blade up and the relief would reset then I would put the blade down and in about 10’ it would do the same thing. Now either the filter and screen is plugged or the spring is weak on the relief or needs to be adjusted some how. I still think that this size tractors hydraulic systems are under cooled and if the fan is not cooling the fluid when it is hot outside in the summer time, then in time it’s going to put undo stress on the system and this problem my have worked up to this over a period of time.






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 02-16-2007, 09:34 Post: 139794
hardwood

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 BX relief lifting

Did your blade hook onto perhaps an edge of some cement or something in the drive that was solid enough to make the tires spin on the tractor before the bypass valve kicked in? Do you have chains on the tractor? Did you drive it back to the shed with the blade lifted without a problem? Maybe your answers to these questions will lead us to your problem a bit quicker. Best of luck. Frank.






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 02-16-2007, 13:53 Post: 139806
botamac

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 BX relief lifting

The answer to hardwood reply is no.






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 02-23-2007, 21:25 Post: 139983
botamac

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 BX relief lifting

Found out today the problem with My Bx the relief valve okay, it’s the pump motor gone bad. I was told by the dealer mechanic it’s a known problem on these tractors. Luckily under warranty.






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 02-24-2007, 18:28 Post: 139989
Art White



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 BX relief lifting

Just got back from vaca but this is interesting to see that the hydro pump was shot! I think they might be searching as we haven't had any problems with them.






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

Thread 139752 Filter by Poster:
Art White 1 | botamac 7 | earthwrks 1 | hardwood 1 | mscott6799 2 | Murf 2 |




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