B7800 hydraulics won't go down!?

[vwkismet]

I have had my B7800 for about 8 months with no problems. I changed all of the fluids when I first got it in May (approx. 200 hours). Everything was fine after that. A couple days ago I took it out of the barn and neither the FEL or the rear 3-point will go down. Both will go up; the FEL will come down in float; but, neither will go down. No fluid is leaking and nothing is obviously wrong. I will obviously check all the hoses, but does anyone know what is wrong right off the bat?

Thanks, Michael in NH

 

[Timber]

Is the Hydrostatic transmission & the bucket dump working properly? I don't think the 3 point hydrolock knob will effect the loader.

 

[vwkismet]

Is the Hydrostatic transmission & the bucket dump working properly? I don't think the 3 point hydrolock knob will effect the loader.

Yes. Both the transmission and dump seem fine.

 

[wdchyd]

vwkismet,

First off I'd suspect a return line/power beyond quick connect is not seated properly resulting in a blockage for the return flow, second I'd make sure the 3ph lever is not engaged in the Full/Up position as this can effect the FEL....

You're obviously experiencing return flow problem back to tank if they go up but not down....Hope this helps....

Bill

 

[vwkismet]

vwkismet,

First off I'd suspect a return line/power beyond quick connect is not seated properly resulting in a blockage for the return flow, second I'd make sure the 3ph lever is not engaged in the Full/Up position as this can effect the FEL....

You're obviously experiencing return flow problem back to tank if they go up but not down....Hope this helps....

Bill

Thanks for the advice. As you suggested, the 3ph lever is out of adjustment and is usually engaged trying to lift the 3ph, thus blocking the return. When I get the 3ph to stop lifting, the FEL works fine.

So, I am going to start searching, but if anyone can point me to a quick and easy tutorial on how to adjust the 3ph lever I would very much appreciate it!

 

[wdchyd]

Nice work Michael....I've seen this before with the 3ph lever (adjustments and operator error)....Enjoy that B7800 with all this snow ......:thumbsup:

 

[easygo]

The adjustments are described in this thread and others I'm sure.

www.tractorbynet.com/forums/kubota-buying-pricing/180412-eat-my-words-about-1-a.html

I have done the same thing a few years back and it took a bit if headache before I figured it out.