JerryG
Super Member
catvet,
That is how that system works.
That is how that system works.
Rotary Cutter Stabilizer chains - brush cutter
- Thread starter survriggs
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survriggs
Silver Member
Greg:
</font><font color="blue" class="small">( your lift arms will eventually go into a float condition )</font>
What do you mean by this?
</font><font color="blue" class="small">( but are useless in stopping them from moving upwards )</font>
The only way I can see that the lift arms would move UP while operating the cutter is if I would bump the lever???
I'm not questioning your advice, I'm just thick-headed sometimes and don't quite understand.
</font><font color="blue" class="small">( your lift arms will eventually go into a float condition )</font>
What do you mean by this?
</font><font color="blue" class="small">( but are useless in stopping them from moving upwards )</font>
The only way I can see that the lift arms would move UP while operating the cutter is if I would bump the lever???
I'm not questioning your advice, I'm just thick-headed sometimes and don't quite understand.
greg_g
Super Member
- Joined
- Dec 18, 2003
- Messages
- 6,126
- Location
- Western Kentucky
- Tractor
- JD3720 Cab, 300X loader with 4-in-1 bucket
When a leakdown condition goes unchecked, there will eventually be nothing holding the lift cylinder in place. As a result, the lift arms will move up and down (float) in sync with the motion of the implement attached. Some tractors intentionally have a FLOAT position on the lift control levels - I think it's actualy just a bypass - since there are some conditions when you WANT the lift arms to follow the terrain.
As far as the lower lift arms moving up with stabilizer chains, the same explanation applies. In a leak down condition, the chains do not present a physical stop in the UP direction - as they do in the DOWN direction.
But then again, who knows what Kubota has got engineered into this 1/4 inch business. I might be completely in the wrong ballpark.
//greg//
As far as the lower lift arms moving up with stabilizer chains, the same explanation applies. In a leak down condition, the chains do not present a physical stop in the UP direction - as they do in the DOWN direction.
But then again, who knows what Kubota has got engineered into this 1/4 inch business. I might be completely in the wrong ballpark.
//greg//
catvet
Gold Member
</font><font color="blue" class="small">( catvet,
That is how that system works. )</font>
That's what I figured. I would think that stabilizer chains would be a great advantage with this sort of system to allow you to get back to the same height you were previously at. Otherwise you end up scalping the ground.
That is how that system works. )</font>
That's what I figured. I would think that stabilizer chains would be a great advantage with this sort of system to allow you to get back to the same height you were previously at. Otherwise you end up scalping the ground.
JerryG
Super Member
If a person has a quarter inching system and using an implement that needs to be returned to the same position repeatedly, the check chains are the best way to go.
greg_g
Super Member
- Joined
- Dec 18, 2003
- Messages
- 6,126
- Location
- Western Kentucky
- Tractor
- JD3720 Cab, 300X loader with 4-in-1 bucket
</font><font color="blue" class="small">( If a person has a quarter inching system and using an implement that needs to be returned to the same position repeatedly, the check chains are the best way to go. )</font>
In the absence of a B7800 owner's manual indicating otherwise, I find it difficult to comprehend Kubota NOT provisioning this "quarter-inch" control system with some kind of adjustable stop for the lift lever.
If true, it gives renewed meaning to the word "cheap" that was used earlier in this thread.
//greg//
In the absence of a B7800 owner's manual indicating otherwise, I find it difficult to comprehend Kubota NOT provisioning this "quarter-inch" control system with some kind of adjustable stop for the lift lever.
If true, it gives renewed meaning to the word "cheap" that was used earlier in this thread.
//greg//
JerryG
Super Member
My understanding of the quarter inching valve is that you hold it in the direction that you want it to go and when you let off it self centers. If you tap it in that direction it will raise or lower one fourth inch but the lever self center when it is let off. It isn't like true position control that the height of the implement corresponds with where the lever is. If this isn't right, I am sure that someone will correct me.
<font color="blue"> If true, it gives renewed meaning to the word "cheap" that was used earlier in this thread. </font>
You got that right. I can see where it would be fine if you were just mowing with a belly mower or a finish mower, but not for anything that is ground engaging.
<font color="blue"> If true, it gives renewed meaning to the word "cheap" that was used earlier in this thread. </font>
You got that right. I can see where it would be fine if you were just mowing with a belly mower or a finish mower, but not for anything that is ground engaging.
JustGary
Silver Member
I personally can't wait to find out about the quarter-inching valve, but here's how the one-inching valve works on my L2800.
It has a standard position type lever with float at the far forward position and all the way up at the rear position. The total travel of the handle on the lever is probably eight inches or so. I'm at work right now or I'd post a photo of the lever for you.
If you start with the lever all the way back (arms up) and then push it forward a little bit, the arms will fall a little bit. If you push it forward further, it will fall more. In general, this action is in one-inch increments, but down travel speed is controlled by the knob near the front of the seat. You get the feeling that you have decent control going down because of the speed adjustment.
On the other hand, if you pull the lever toward the rear, nothing will happen until you pull it far enough for the valve to get to the next increment. You know when you get to the next increment because the arms then rise one inch. Suddenly. With full force. No feathering, no force adjustment. One inch at the arms means about six inches at the tail wheel of a five foot mower, by the way, and when that baby jumps, the whole tractor does. That's the source of complaints with the one-inch valve that Kubota will replace.
I presume that the quarter-inch valve will work in the same way except that 1) it moves in quarter-inch increments instead of one inch, and 2) I hear that it feathers better rather than just jumping to the next increment all of a sudden (in other words, a proportional indexing valve).
At least I hope #2 is true, and as soon as my dealer gets the part, I'll know for sure.
Obviously, someone with actual experience with the quarter-inch valve could tell us for sure about the action of the lever.
- Just Gary
It has a standard position type lever with float at the far forward position and all the way up at the rear position. The total travel of the handle on the lever is probably eight inches or so. I'm at work right now or I'd post a photo of the lever for you.
If you start with the lever all the way back (arms up) and then push it forward a little bit, the arms will fall a little bit. If you push it forward further, it will fall more. In general, this action is in one-inch increments, but down travel speed is controlled by the knob near the front of the seat. You get the feeling that you have decent control going down because of the speed adjustment.
On the other hand, if you pull the lever toward the rear, nothing will happen until you pull it far enough for the valve to get to the next increment. You know when you get to the next increment because the arms then rise one inch. Suddenly. With full force. No feathering, no force adjustment. One inch at the arms means about six inches at the tail wheel of a five foot mower, by the way, and when that baby jumps, the whole tractor does. That's the source of complaints with the one-inch valve that Kubota will replace.
I presume that the quarter-inch valve will work in the same way except that 1) it moves in quarter-inch increments instead of one inch, and 2) I hear that it feathers better rather than just jumping to the next increment all of a sudden (in other words, a proportional indexing valve).
At least I hope #2 is true, and as soon as my dealer gets the part, I'll know for sure.
Obviously, someone with actual experience with the quarter-inch valve could tell us for sure about the action of the lever.
- Just Gary
Bird
Rest in Peace
Gary, your tractor has "position control" instead of a quarter inching valve and they're two entirely different things.
JustGary
Silver Member
Dawg. Sorry. I should have known to keep my fingers shut. I've read the posts about the Kubota fix for the L2800, and thought that the fix was a quarter-inching valve. I just frustrated that mine doesn't have it yet. Thanks.
I'm sorry for the interruption. Please continue the thread in your normal manner!
- Just Gary
I'm sorry for the interruption. Please continue the thread in your normal manner!
- Just Gary
