KUBOTA B2150 hydraulics

[Professor Marvel]

One of my tractors is a B2150. I recently took it to a shop to have the dryrotted hydraulic lines replaced. This unit has a front blade. This person managed to get the hydraulic lines back together wrong. In order to lift the rear hitch you must be operating the blade. I do not see any reason to take it back to him since he could not figure it out the first time. I guess I will try to figure it out myself.
My question is---does anybody have a diagram of the hydraulics I would need to get these hoses right?

 

[jmz1]

i am not exactly sure what lines you are talking about but we may be able to compare lines on my 2150 with yours by pictures.

 

[Yankee Clipper]

If you have to stroke another function to make the hitch work, the unloading valve on the postion control valve is sticking open.

Quick explanation is on an open center system, the pump sends flow to the hitch always with the engine running. You only need it when you want to raise the hitch so the unloading valve stays open until such time as you move the position control handle. A flow path to the backside of the unloading poppet shuts it hydraulically and then the fluid can go past the open main spool and up to the cylinder to turn the rockshaft and lift the load on the arms.

When the demand is met - noted from the followup linkage - the spool is pulled back to neutral, the unloading poppet opens and the flow dumps to tank. The hitch stays put if there is not a lot of clearance between the main spool and the valve body or if the cylinder shut off is closed completely.

I would take it back to the guy who did the work and have him make it right as you paid for hoses not a new problem to come to light. They should make it right if they screwed up and is sounds like they did.

Good luck!

YC