Why does my loader only raise after switching work ports on a 2 spool valve?

[tomf]

I have a b2400 with LA352 loader with a Husco 9210 2-spool valve. The spool that controls the loader arm has a float position. I'd like to use the float position with the cylinders that control the bucket. So I switched the hydraulic lines going into the work ports. I expected the controls to be reversed and the float position would now control the bucket not the loader arms. Well, that's what happened except now the loader arm moves up when it should should be going up and when it should be going down.

Why would it go up when it should be going down? What do I not understand about the valve that would cause this. Thank for your help in advance.

 

[Willl]

Does that valve have a "regen" feature in that circuit ?

(regen = regenerative)

 

[tomf]

I believe it does. The brochure on the 9210 valve says this concerning the spool in question "4 position spring centered end mechanism with 'feel' in regen." What does regen mean? Thanks Tom

 

[Willl]

What does regen mean?

Regenerative.

Kubmech did an excellent explanation of regen at this thread below.

Kubmech's regen explanation.

 

[Steve_Miller]

I have a b2400 with LA352 loader with a Husco 9210 2-spool valve. The spool that controls the loader arm has a float position. I'd like to use the float position with the cylinders that control the bucket. So I switched the hydraulic lines going into the work ports. I expected the controls to be reversed and the float position would now control the bucket not the loader arms. Well, that's what happened except now the loader arm moves up when it should should be going up and when it should be going down.

Why would it go up when it should be going down? What do I not understand about the valve that would cause this. Thank for your help in advance.

Just reverse your loader arm lines. I'm assuming your tractor is a lot like most and when the loader arms go up the cylinders extend and when the bucket lifts (curls back) the cylinders are retracting or opposite. This is if I understand what you are doing.

Steve

 

[tomf]

I tried switching the lines. Still the loader booms only goes up. I still don't understand why. From what I've read on regen circuits the rod should retract sometime and not always extend. Help.

 

[Willl]

Tom, does the boom move the same through out the entire control handle movement ?

What I mean is to try different positions between control handle rest and full down boom.

On my tractor with regen function on the dump control, when using this circuit for my grapple cylinder, there are spots/areas in my control handle movement that will make it move in the opposite direction and other spots where it won't move at all, almost as if it's fighting its self. (does this description make any sense ?)

If it doesn't act like above, maybe my hunch on the regen isn't causing your problems.

 

[Steve_Miller]

Tom, does the boom move the same through out the entire control handle movement ?

What I mean is to try different positions between control handle rest and full down boom.

On my tractor with regen function on the dump control, when using this circuit for my grapple cylinder, there are spots/areas in my control handle movement that will make it move in the opposite direction and other spots where it won't move at all, almost as if it's fighting its self. (does this description make any sense ?)

If it doesn't act like above, maybe my hunch on the regen isn't causing your problems.

On my Kioti, (i"m pretty sure) it has a float position for both, the float for the arms is a detent position all the way forward but the float position for bucket dump is is all the way to the right but you have no feel for when you hit this position as the bucket still dumps. You can't tell you've hit it unless you have the bucket on a surface with down pressure and have the handle pushed all the way to the right and the bucket will curl back instead of curling down. Make any sense? If so, you may have to experiment with you're lines again to find this.


Steve

 

[MarkV]

Tom I am curious why you want a float position for the bucket? I guess by hitting float it would dump the bucket fast but I am having a hard time seeing any other advantage. Of course it may just be another senior moment on my part.

MarkV

 

[tomf]

Willl
When the joystick handle is placed in one direction the loader arms move up normally. When the joystick handle is placed in the opposite direction the loader arms move up but at a slower rate. In no joystick position do the loader arms move down. To get the loader arms to come down I have to shut off the engine and equalize the pressure by moving the joystick. Specifically, I have to move it left then right (or vise versa if I have the lines reversed). Then the loader arms will drop about 6 to 12 inches. I can see the loader hoses move from the change in pressure as I move the joystick. So it seems that pressure is decreased and then a second or two later the pressure builds up to stop the downward movement.

Steve
I'm pretty sure I don't have float on both spools.

MarkV
I don't want the float to dump the bucket. I want it because I've been working on adding a snow blade to my loader. In fact, it's done and works except for the painting and hydraulics to angle the blade. I plowed snow with it yesterday. I'll attach a picture. Figuring out the hydraulics has been a pain because of the different type of connectors I needed. But I think I've figured it out. Several years ago I purchased a used blade thinking it had the hardware to attach to my B2400. Wrong! The hardware was for some other Kubota. The dealer wanted over $1000 for the mounting hardware so it sat in my barn until about a week ago when I saw a simple way to attach it. However there were some physics I had not thought about. For instance, when the blade is angled and the blade is pitched up or down, one side of the blade is lower than the other. Which means either snow is missed or the blade digs into the ground on one side. This means that the mount needs to be parallel to the ground. If I use float position on the loader arms the loader arms will dig into the ground because of my attachment design. Not good. So I thought that by using float to control the pitch, the snow blade would follow the contours of the road. It seemed to work based on the limited testing I did before I realized I had no down control of the arms.
Disregard what I wrote about the loader arms digging into the ground on float. Because I've just figured out and tested that they do not. When I tried it before the blade must have been pitched up. I'm going to go test it in the snow after it warms up a little. Thanks MarkV. If I hadn't written this response, I never would have thought about it.

I still do not know why my control arms only go up. I would still like to know why.