Power steering not working

[Fatzi]

Hi folks
I have a Kubota B8200 tractor made in the early 90’s with a bf300 front end loader on it. It has a D850 motor in it.
I lost my power steering but if I lift up on the loader it works fine. I’m thinking something is blocked up in the loader controls because that is where it is fed from. Any thoughts on this?

 

[North Idaho Wolfman]

What your picture shows is the hydraulics for the loader, nothing to do with the steering.
PS on that model was an add on so need picture of it and how it's hooked up.

 

[Fatzi]

What your picture shows is the hydraulics for the loader, nothing to do with the steering.
PS on that model was an add on so need picture of it and how it's hooked up.

that is correct. It is being feed from the top left hose on that picture going down to this control valve (hose with the white dot on it. To the power steering cylinder

What your picture shows is the hydraulics for the loader, nothing to do with the steering.
PS on that model was an add on so need picture of it and how it's hooked up.

 

[TheOldHokie]

that is correct. It is being feed from the top left hose on that picture going down to this control valve (hose with the white dot on it. To the power steering cylinder

The PS is fed by a priority flow divider that splits the output from the hydraulic pump into two independent streams. The priority flow is sent to the PS circuit and the excess flow is sent to the loader valve. You nèed to have a look at the flow and pressure on the priority side of that vslve.

Dan

 

[TheOldHokie]

that is correct. It is being feed from the top left hose on that picture going down to this control valve (hose with the white dot on it. To the power steering cylinder

Thats the older hydraulic outlet block used in early production but I dont think that hose feeds the PS.

I think that hose is pump out to the loader valve and i believe loader tank and power beyond returns are the two bottom pipes.

PS is a separate circuit fed by the two steel pipes on top of the outlet block and is independent of the loader.

Dan

 

[Fatzi]

Thats the older hydraulic outlet block used in early production but I dont think that hose feeds the PS.

I think that hose is pump out to the loader valve and i believe loader tank and power beyond returns are the two bottom pipes.

PS is a separate circuit fed by the two steel pipes on top of the outlet block and is independent of the loader.

Dan

Hi Dan
This is what I plan on doing. I’m going to inspect this valve on my bench because I believe something is blocked in there.

 

[Fatzi]

I’m sorry for all the reply’s I working off a new iPad I got

 

[North Idaho Wolfman]

@Fatzi
Your problem is very likely NOT with the loader valve.
Taking the loader valve apart is a waste of your time.
If something was blocked in the loader valve the loader wouldn't work.

Your problem would be with the priority valve (divider valve) in the block at the bottom.
The loader does not feed the PS.
The PS and loader are fed from the pump, they just get different flow amounts based on the priority valve.
And the priority valve should always give you flow to the PS before the loader.

Be very careful taking it apart, do it in a very clean and organized environment, paying very close attention to how each part, and direction of each part, comes out of the block.