Position Control question: Kubota Review  -- Kubota Tractors Discussion Forum and Review Position Control question: Kubota Review -- Kubota Tractors Discussion Forum

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 12-28-2003, 18:42 Post: 72490
BARNEE

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 Position Control question

I have an L3000DT with position control. I seem to get good control over movement of the 3ph in the downward direction (i can lower it incrementaly with incremental position lever movements), but not as good in the up direction. Once the 3ph has been lowered to a certain position I have to move the position lever quite a ways in the opposite direction before it starts to raise. it's basically a trial & error process to find the point the implement will start to raise again. Makes it difficult to control for box blade work. Is this pretty much normal? My B7100D had finer control although it had a slightly different system.

thanx






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 12-28-2003, 19:46 Post: 72500
Art White



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Barnee, I wonder if the hitch is centered on the control. Check your manual as I believe they have some good information on the hitch.






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 12-28-2003, 20:23 Post: 72512
BARNEE

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Art, thanx for the reply. I take it from what you say that my experience isn't normal for position control. I looked at the manual. It has a section on '3ph & Drawbar' and another on 'Hydraulics'. Both are pretty basic & neither discusses centering of anything. What exactly do you mean by being 'centered on the control?

thanx






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 12-28-2003, 21:21 Post: 72531
Art White



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Let me get to the shop in the morning so I can refresh myself on that model. All three points are going to work differntly from model to model, make to make.






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 12-29-2003, 06:18 Post: 72546
TomG

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 Position Control question

My Ford hitch works pretty much as you describe and I've always thought of it as normal--I might learn something here. It does make a difference whether the hitch is in a float position or not. There isn't much delay to the lift as long as there's weight on the hitch. Some delay happens when the position is set lower than the implement on the ground. I think it takes time for valves to close and pressure to build to the weight of the load. In addition, if the 3ph is in float, the control lever has to be raised to the level of the implement before the hitch goes into lift mode.

I've said before that I never was able to get a box scraper to work very well trying to control it with the 3ph but then I didn't try too long before I got a hydraulic top-link. You may be experiencing what is normal for the 3ph but Art likely will be able to say for certain. I forget which hitch was discussed here where the control lever moves in clicks, and each click represents a specific increment of movement.






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 12-31-2003, 08:24 Post: 72769
Art White



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Well I couldn't really find a reason for it to be the way it is,but didn't find a way to cure or change it. Did find out others are the same so that is the good point. Now it's just time to adjust ourselves to fit around the equipment.






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 12-31-2003, 18:26 Post: 72809
BARNEE

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Thanx Art, i appreciate the help






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 01-01-2004, 10:36 Post: 72835
TomG

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 Position Control question

I think the main idea to get used to is that operating the lever isn't the same as raising or lowering the hitch. Changing a position control hitch changes the position. In operation a changed position may raise, lower or do nothing to the height of a hitch. Particularly when a hitch is in float, there's no way to tell how far up the lever much be pulled to put the hitch in lift, and the amount of float changes as both the implement and tractor follow the ground contour.

When I first got my scraper I tried some grading. The scraper would try to take bigger bits as it first started up hills. I tried to reduce that by raising the 3ph as I started up a hill--it didn't work very well. What I now realize is that even if there was little float when on the level, the float increased as the tractor started up a hill. Anytime a hitch has float, there's a range where pulling the lever up does nothing. I'd inch the lever up and nothing would happen. By the time I would hit lift, the scraper would already be on the hill and would dump the box. I just don't think a position control hitch is designed for this type of control. I was certainly never able to get good results trying it.






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 01-01-2004, 16:25 Post: 72849
Art White



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Tom, just for for your info that is where draft control comes in for your depth control instead of the hitch control.






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 01-02-2004, 06:22 Post: 72881
TomG

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Morning Art. I solve the bigger bite at the bottom of a hill problem by tweaking the box back slightly with a hydraulic top-link but trying draft control would be interesting. The top-link gives me fairly precise control unlike the 3ph. I solve the dumping box when going over a dip or when cresting a hill by giving the 3eph plenty of float.

When I thought Barnee's comment through I believe I identified a common misconception. The thing is called a lift and it's sort of natural to think that the lift raises when you pull the lever up and lowers when the lever is put down, but that's not exactly what happens. It only lifts if the new position set by the lever is higher than the level of the hitch at that time. It only lowers if there's weight on the lift.

Since I use mine with a lot of float I think that means I'm unlikely to get the right movement at the right time with position control. Draft control could do it better though. It might be less confusing if we stopped calling them lifts but then what else would they be called?






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

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