donalddavis
New member
Hi everyone. Well, I've had mt new Kubota B2910 for about 5 days now and am already tikering with it's innards! I couldn't stand that throttle lever any more. It was very hard to move smoothly..I could move it but with a jerky, unsmooth action. So...I took off the one screw on the upper front of the plastic cowling, knocked the roll pin out of the throttle lever (so I could move the cowling up a bit to access the adjustment nuts, and eventually lfted the thing up high enough under the steering wheel (which I left in place) to get a wrench in on those nuts. The jamnut was backed off (they're 12 mm wrench size) and then I backed off the flange nut just a bit. The result was the throttle couldn't stay in any position because now the spring action of the whole throttle linkage setup was greater than the friction on the fiber (I think) plates of the throttle lever. So, I decided to take the whole thing apart and put high pressure/temp grease on everything and torque it back down. Under the flange nut, is a flat washer and two black springy washers that may be made out of some sort of fibre...not really sure. They are arced so that when flattened out under the pressure of the flange nut, they will be supplying frictional force to keep the whole mechanism from returning to idle under the effect of the linkage spring. I cleaned off whatever grease was on the washers along with the WD 40 I had sprayed on (to no avail)and smeared the sticky high pressure grease on all surfaces. I lifted the throttle rod up high enough to put some of that grease on the similar washer located on the upper side of the mounting flange that the mechanism passes through. Then, I put back the flange nut. Had to guess at how hard to tighten it, then reposition the plastic cowling so that I could temporarily put the throttle handle back on the shaft to see if it worked right (too loose or too tight). Turns out luck was on my side and it was a good guess at the amount of torque supplied to the flange nut. Then, I took the throttle handle back off again (I had stck a drill bit through the cross hole so I could have it turn the rod without having to reinstall the roll pin,), lifted the cowling back up a bit, and put on the jam nut. I didn't have a wrench narrow enough to hold the flange nut in position while tightening the jam nut, so had to grind down one of my 12mm open end metric wrenches, sacrificing it into the "special tool" category. Finally managed to get the jam nut tight enough without screwing up the torque on the flange nut, and put evything back together. It works like an absolute dream now. Nice solid feel but smooth as butter. I put all the details of this job on this post in case any of you have the same problem and are sick of dealing with it. I think the engineers should have used teflon for those thrust washers. It would have been smooth and still provided the necessary resistance to keep the throttle at any specific setting. Hope this helps! By the way...I read some posts about bad brakes so decided to test mine on a slope while the HST was in neutral. The thing stopped on a dime and the parking break mechanism held it in place just fine. I love that tractor despite minor glitches.
Don
new member
Don
new member
