third function

[Ronny Karriker]

I have a new Kubota M4-71 with factory third function,when using third function the loader will not work, Dealer not having much luck. Anyone else having this problem? It is a Kubota factory third function.

 

[WranglerX]

Need better description of "loader will not work" do you mean raise and lower of bucket or curl and dump of bucket, Or all the above?

 

[oldnslo]

How is 3rd function plumbed? Some pictures of valve location and plumbing would help.

 

[dusty3030]

Open center hydraulic system. It runs in a series. Whatever is first in the series gets the priority of flow. If something upstream is being used anything downstream has to wait it's turn. If the thing upstream isn't using all the available flow the next thing downstream may work simultaneously but that is just a bonus not a guarantee.

Basically start at the pump and follow the lines and you'll see what goes where. The three point is 99.9% of the time the last thing in the series. Most of the time on these smaller tractors it goes pump to loader to any rear remote you might have to three point and then back to tank. Steering is on a separate circuit so that it's not affected. Your third function is in the series before the loader valve hence while you are using the third function the loader isn't responding.

 

[WranglerX]

Open center hydraulic system. It runs in a series. Whatever is first in the series gets the priority of flow. If something upstream is being used anything downstream has to wait it's turn. If the thing upstream isn't using all the available flow the next thing downstream may work simultaneously but that is just a bonus not a guarantee.

Basically start at the pump and follow the lines and you'll see what goes where. The three point is 99.9% of the time the last thing in the series. Most of the time on these smaller tractors it goes pump to loader to any rear remote you might have to three point and then back to tank. Steering is on a separate circuit so that it's not affected. Your third function is in the series before the loader valve hence while you are using the third function the loader isn't responding.

I thought third function was used in place of hydraulic (diversion) for bucket curl/tilt, so (in most cases) it could operate a grapple....

 

[Mike1955]

Open center hydraulic system. It runs in a series. Whatever is first in the series gets the priority of flow. If something upstream is being used anything downstream has to wait it's turn. If the thing upstream isn't using all the available flow the next thing downstream may work simultaneously but that is just a bonus not a guarantee.

Basically start at the pump and follow the lines and you'll see what goes where. The three point is 99.9% of the time the last thing in the series. Most of the time on these smaller tractors it goes pump to loader to any rear remote you might have to three point and then back to tank. Steering is on a separate circuit so that it's not affected. Your third function is in the series before the loader valve hence while you are using the third function the loader isn't responding.

Sounds like you are more knowledgeable about this than most