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Kubota steering

T

TKiste

Member
I have two properties a half mile apart. When driving my little Kubota BX down the paved road that half mile, the steering wheel makes a full revolution to the left. When starting out, say the symbol is straight up, about quarter mile the symbol is upside down, then back to straight up again. yes it is a straight road. It turns back an forth as it should and the wheel will stop if turned all the way in either direction. just going straight for long distances it slowly rotates to the left. Is this an indicator of something going wrong? Internal fluid leak? Just a quirk of power steering? Losing my mind?
 
If everything's tight ie tie rods steering knuckles steering cylinder attachment itself no leaks than I wouldn't be too worried. Just about every power steered tractor we've had over the years does it too.
 
Recently had the same problem with the steering on my Super E Case. After I rebuilt the LH steering hydraulic cylinder the problem went away.
 

It is due to the fact that it is hydrostatic and that your driveway has a crown to it that is constantly pulling your front tires to the right. perfectly normal.
 
My F-2000 has done that fore as long as I have owned it (+-12 years). Mine (1988) is a full hydraulic steering, not hydraulic assist. I mow and clear snow with it and have put 1,300 or so hours on it.
a257145.jpg
 
When Case switched over from power assist steering to hydrostatic steering they changed the steering wheel and emblem in the center so you couldn't define the top or bottom.
Loren
 
I've known about the phenomenon for a long time (my Oiver 1550 did the same, from the day I bought it in 1976). However, not until now did someone give a logical explanation (crown in the road). Thanks!
 
If it is full hydraulic steering with only one cylinder and if that cylinder does not have a rod out of both ends then it is going to do that. The hydraulic unit which has the shaft from the steering wheel going into it displaces a given amount of fluid per revolution, usually designated as cubic inches per revolution. The hydraulic cylinder which does the steering has more cubic inches of volume on the end without the rod. Therefore, it takes more turns to fill one end of the cylinder than the other. Since steering keeps requiring small corrections, it ends up using more oil to turn one direction than the other. This also means the steering has more power turning one direction than it does in the other direction.
 
My neighbor has an older BX2200. I have been taking care of it for several years for her. IIRC last year I put a new steering cyl. on it and she said that was like the 3 rd. one. Kubota had problems with those cylinders. You could tell hers was not steering right. I didn't know how she could mow with it !
Also had to replace the power steering hoses as the early ones were not good hose. For the most part pretty much trouble free.
 
(quoted from post at 10:17:02 02/16/18) If it is full hydraulic steering with only one cylinder and if that cylinder does not have a rod out of both ends then it is going to do that. The hydraulic unit which has the shaft from the steering wheel going into it displaces a given amount of fluid per revolution, usually designated as cubic inches per revolution. The hydraulic cylinder which does the steering has more cubic inches of volume on the end without the rod. Therefore, it takes more turns to fill one end of the cylinder than the other. Since steering keeps requiring small corrections, it ends up using more oil to turn one direction than the other. This also means the steering has more power turning one direction than it does in the other direction.
Click to expand...

Paul, I agree with most of your post, but that has nothing to do with the "centered" position of the steering wheel changine over time/distance.

That's because of "slip" in the hydrostatic steering unit, or possibly some oil leaking past the piston sealing rings in the steering cylinder(s).

"Slip" in the hydrostatic steering unit is simply a small (normal) amount of leakage past the precision fitted internal parts, there are no seals in that area.
 
Well, Well let me wade in to this mess. First of all yes EARLY BX tractors had plastic steering lines and a recall replace all of those. The steering cylinder is two way with same rod out each end so no difference in displacement. Out of probably 450 BXs this dealership has sold looks like we have replaced 7 steering cylinders, are they problematic maybe but not to a great degree. I have and do get the complaint the poster is talking about . Not certain there is any wrong but just more the nature of the beast. If anything needs or could be done might remove the steering cylinder and repack the operating cylinder, but I certainly would not tell you that doing that will make your tractor not drift in the steering on the long road drive.
 
I should of added.
If it is not leaking external and if when you go to turn it the wheels react in relation to you turning the steering wheel I'd say it is likely fine. When the neighbors went bad inside the cylinder it started gaining play from when you turn the steering wheel until the tires moved. Extremely hard to keep it going in a straight line ! Her dealer told her they updated or changed them inside and I think maybe a part number supersession too ? It was easy to change if it does go bad.
 
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