B8200 Loader dwn 3ph dwn

[dusty-t]

OK so this little b8200 I bought has been great I love it. But, and there always seems to be a (but). With the loader up and the 3ph up if you power the loader down the 3ph goes down as well. Release the loader control and the hitch comes back up. It was down on fluid, I topped it up and no difference.? priority valve ? air lock? Dumb Owner?? Any help would be appreciated. Thanks.

[Service Dept Vic]

At first blush it sounds like a hydraulic line is switched on the Power Beyond circuit.

dusty-t, can you let me know if you have a factory Kubota loader, should be a BF300 on the B8200.

Is plumbing all factory, or has anything been added, like an auxilliary rear outlet? Tell me about the control valve, is it a two spool block, with Kubota's "wobbly joystick" conversion idea??

[dusty-t]

Hi Vic. You will learn fairly quickly that nothing I own is original. And yes I know all about Guys like me , to a service tech we can be a nightmare. Now!! The good part!! The loader is an la640 off of the b7200.The valve is aftermarket 2 spool the same setup as the original valve on the la640, everything is in the spot.The loader has been on the tractor for about a month and this is the first it has done this. And yes I worked for guys like me for most of my life. That's why I am so so so so sympathetic, I'll try not to make you guys too crazy.

[dusty-t]

Sorry I should have answer'd .. there is no auxiliary.

[dusty-t]

I have the B8200 service manual and it give a pretty good description of how to hook the hoses up. It didn't like it when hooked it up without the power beyond. Ya that got changed perty quik!! When I first started it this morning it kinda bounced a bit like the hydraulics were surging. It stopped once it warmed up. It only does this thing with the 3ph when you bring the revs above 1400 rpm or so. And thats whether its warm or cold.

[Service Dept Vic]

Ok, check that the hand lever that activates the 3PH is not slightly off its center resting position, and make sure that the feedback linkage from the lift arm to the lever is not binding.

Next, with the tractor turned off, operate the joystick so you can visually see and operate each of the spools on the control valve. You want to make sure they move freely and return to their "centre" neutral position own their own.

Clean up the spools, lube it up, etc. Kubota cheaped out a little on that imitation joystick control, and it can bind on it's convoluted linkage set-up.

If these external service items don't resolve the issue, then the fault is internal to the control valve. Each spool has an internal centering spring, that if weak or broken, will not allow the spool to centre, sending fluid power to two different circuits.

There may also be foreign material inside the control, hanging up the spool, or the lift check valve, which is internal to the control valve, is faulty.

Let us know what you find.

[dusty-t]

The loader valve is 3 months new, Joystick which I realy like. That wobbly stick on the original was horrible.I will check and lube the loader valve but I think you may be right about the 3ph lever. I should have thought of that. I know things I do, -- really I do. Its just retreiving what I know when I need to know it.

[Service Dept Vic]

Report back, 1st Year Apprentice! We'll get that Kubota fixed!

[dusty-t]

Adjusted 3ph works great.Thanks Vic.

[Service Dept Vic]

We're here to help!

[dusty-t]

Well you certainly did that, it took all of about 4 minutes.