Rotary Cutter Stabilizer chains - brush cutter

[Bird]

No problem, Gary, and you're not interrupting . . or at least not any more than I am. /forums/images/graemlins/wink.gif /forums/images/graemlins/laugh.gif If you cannot move your 3-point up and down in very small increments with the position control, then I would assume something is not right with it, and personally, I'd much rather have position control than the quarter inching valve.

 

[JustGary]

The Kubota L2800/L3400 position control has gotten lots of attention on this board (under "lift shudders" mainly; it's more than a shudder, I can assure you). It really does raise in 1" increments, which stinks for pretty much anything you can possibly imagine doing with a 3PH. Well, except for ensuring that your implements are perfectly clean when you raise them, because most everything gets knocked off when the implement jumps up and then stops abruptly.

On the other hand, it does have a float position, thus helping with some of the unlevel ground brush cutter issues I've also seen on the board. Especially if I would use stabilizer chains to limit the down travel (there, I got the thread back on topic!)

I don't know if the "new" Kubota valve has float or not. I'll know soon, I hope. Kubota will replace it if the dealer ever actually orders the part.

The quarter-inching valve seems like it would have very similar issues, except (duh) four times less movement. I can see how even the quarter inch on the arms is still way too much movement for most implements.

Is it really a rate valve like JerryG suggested, or is it a position lever like greg_g says? If it is a rate control, then stabilizer chains would keep you from having to look before you lower it too far.

Sorry about rambling. My posts seem longer than most others. Once I start thinking I can't stop!

- Just Gary

 

[jgbiker]

Folks, please excuse me for interrupting, but there is some kind of adjustable stop for the lift lever on a B7800. It takes alot of patience to get the adjustment just right or you will have very slow leak down, and it will have to be readjusted for different implements. I know because I had a 7800. Look at the right side lower link arm. There is a rod that runs forward from an ear at the arms pivot point through a hole in a pivoting arm of the 3 pt. control system. The rod should have a spring on it in front or behind the pivoting arm. I forget where. On this rod there should also be an adjustable sliding stop. Lower your implement to where you want it to be, push the sliding stop against the pivoting arm of the 3 pt. control system forcing the arm to pivot so that it stops any further lowering. My dealership knew about this feature but doesn't use it because it takes to much trouble to adjust. So I got rid of the 7800 and went with a B3030 which has a different set of problems. O a little fyi. A friend and I purchased our B7800 together. When we complained to the head area rep. of the western area about the poor way that Kubota explains the functioning of the quarter inching feature. and that if we had known, we wouldn't have bought the tractors, he offered to change out the quarter inching system for the control valve system. Supposedly it's an easy swap.
John

 

[greg_g]

</font><font color="blue" class="small">( Lower your implement to where you want it to be, push the sliding stop against the pivoting arm of the 3 pt. control system forcing the arm to pivot so that it stops any further lowering. )</font>
Thanks John. Even without Kubota experience myself, I thought it just had to be downright irresponsible if there wasn't SOME way (besides check chains) to regulate lift arm travel.

//greg//

 

[jgbiker]

I thought it just had to be downright irresponsible if there wasn't SOME way (besides check chains) to regulate lift arm travel


greg_g
It is irresponsible. There is no mention of the procedure I descibed in the owners manual. I discovered it by trial and error. The way quarter inching works is if you want to raise the implement, you pull back on the lever to the first stop and then release. The lever goes back to the center position and the implement raise 1/4 " pull back on the lever again and the implement will raise another 1/4" etc. If you want to raise the implement all the way up, you pull back on the lever past the the first stop and release, the lever again returns to the center and the implement fully raises. To lower the implement you use the same procedure except you push the lever forward. You can't lower the implement to a preset position with quarter inching. You have to lower it a 1/4" at a time by going to the first stop and releasing or going past the first stop and releasing just at the right height. If you use the go past the first stop mode, you have to make sure the speed control valve is set real slow or else the implement to go all the way to the ground before you can release the lever. I should mention that the procedure I described in my ealier post only works if you push the lever past the first stop.
John