Chilly807
Elite Member
To answer Texas Boy's question, I did adjust mine to the specs in the workshop manual, which were quite different to the factory settings in one dimension. It was butter smooth when I was done.
The problem that caused was that the implement was being "held" dynamically by flow through the 3pt position control valve mounted above the transmission, inside the tranny case.
When you used the loader valve or the remote hydraulics, whatever implement was on the lift arms would drop a couple inches, then snap back up as soon as you stopped using the other hydraulics.
It is a series circuit, using "power beyond", or "high pressure carry over" as it's known in Europe. Unless downstream valves, such as the 3pt control valve in this case (last valve before the sump), are closed, any use of upstream hydraulics, such as the loader or remotes will affect the 3 point arms' position.
It was bad enough I decided it was worse than the original jerkiness and I reset the valve to it's original condition. LD1 found the same thing with his, as did SMWeatherman on his MX4700.
So, I think they were deliberately set incorrectly to minimize a problem the factory techs at Kubota know there's no easy fix for.
In short, if it walks like a duck, sounds like duck, looks like a duck.. It's a duck. No way all three tractors were set "wrong", three different years and 2 different models. And coincidentally set "wrong" to an adjustment that eliminates pogo-ing of the 3-point at the expense of smooth operation? Come on, really? What it is, is a compromise, and nothing but.
If you want to read the thread on my adjustment saga, it's here, just search for L3400 3-point hitch adjustment, there are pics too.
The reason SMWeatherman's and Jeff's works better is that the pc flow control valve has a damping effect on the flow of oil to the cylinder.
Just for fun, try standing on the lift arms and slowly raise the lift at idle. It'll feel like someone's hitting the soles of your boots with a hammer.
Like James said, other than this issue it's a great tractor, they just didn't correct the 3-point operation in the design phase.
If you'll excuse me, I need to check my blood pressure...
Sean
The problem that caused was that the implement was being "held" dynamically by flow through the 3pt position control valve mounted above the transmission, inside the tranny case.
When you used the loader valve or the remote hydraulics, whatever implement was on the lift arms would drop a couple inches, then snap back up as soon as you stopped using the other hydraulics.
It is a series circuit, using "power beyond", or "high pressure carry over" as it's known in Europe. Unless downstream valves, such as the 3pt control valve in this case (last valve before the sump), are closed, any use of upstream hydraulics, such as the loader or remotes will affect the 3 point arms' position.
It was bad enough I decided it was worse than the original jerkiness and I reset the valve to it's original condition. LD1 found the same thing with his, as did SMWeatherman on his MX4700.
So, I think they were deliberately set incorrectly to minimize a problem the factory techs at Kubota know there's no easy fix for.
In short, if it walks like a duck, sounds like duck, looks like a duck.. It's a duck. No way all three tractors were set "wrong", three different years and 2 different models. And coincidentally set "wrong" to an adjustment that eliminates pogo-ing of the 3-point at the expense of smooth operation? Come on, really? What it is, is a compromise, and nothing but.
If you want to read the thread on my adjustment saga, it's here, just search for L3400 3-point hitch adjustment, there are pics too.
The reason SMWeatherman's and Jeff's works better is that the pc flow control valve has a damping effect on the flow of oil to the cylinder.
Just for fun, try standing on the lift arms and slowly raise the lift at idle. It'll feel like someone's hitting the soles of your boots with a hammer.
Like James said, other than this issue it's a great tractor, they just didn't correct the 3-point operation in the design phase.
If you'll excuse me, I need to check my blood pressure...
Sean
