BH75 hydraulic headache

[jsranman]

I have a b2630 with a bh75. One of the backhoe hoses has a gusher of a leak not too far from where it goes into the control valve area. I could use some guidance before I go ripping this apart.

I think the hose is to the arm that make the backhoe go up and down. If that is the case, there is no access to the other end of the hose because the connection and piston is within the arm. It looks like you need to remove the piston as well as disconnect five other hoses that go up the interior of the arm because the broken line is within a protective sleave with 5 other hoses.

Getting the piston out looks tricky. It appears as though you need to have the arm all the way down, so that there is room on the tractor end of the arm to slide the piston out of the arm.

Is this line to the piston described?

Do I have to remove the pistion to replace the hose?

What about supporting the arm during piston removal?

Do I have to disconnect the five other hoses so that I can bring these down the arm as well when I remove the piston?

Here are some pics of the situation. The leaky line is the one that loops down. It has yellow tape on it. I think it is on the bottom line of connections on the valve, second one in.

Here is a picture of what did it. Lots of site work for a gutter drainage, retaining walls, set of stairs and leveling out an area for a basketball court.

Any help would be appreciated.

 

[RickB]

From what I can see, I think you have the situation assessed well. I'm glad I don't own one of those. The backhoe must be of Kubota's own design; typically not technician friendly in any way. A 'normal' hoe (Woods, Arps, Whoever) can have the hoses serviced much easier.

 

[jsranman]

Replaced the hose this afternoon. Things were pretty much as I thought except I did not have to disconnect the other hoses. I was able to scrunch up the protective sleave such that the piston came out. The upper pin was a bit stuck so I had to really pound on it to get it out. I used a cylinder hone I had from rebuilding a lawnmower engine to take the corrosion out of the holes for the pin and it went back in fine.

The action of the boom seems a little slow though. I am wondering if it could be air in the lines or low fluid. I am also wondering if it could have something to do with a larger hose. I got the hose from NAPA instead of Kubota. Although the hose fit fine it seemed to me that the internal diameter of the new hose was a bit bigger. In the back of my mind I am wondering if this could be a reason why the action is slow. Maybe I have to work it a bit.

 

[mswlogo]

Replaced the hose this afternoon. Things were pretty much as I thought except I did not have to disconnect the other hoses. I was able to scrunch up the protective sleave such that the piston came out. The upper pin was a bit stuck so I had to really pound on it to get it out. I used a cylinder hone I had from rebuilding a lawnmower engine to take the corrosion out of the holes for the pin and it went back in fine.

The action of the boom seems a little slow though. I am wondering if it could be air in the lines or low fluid. I am also wondering if it could have something to do with a larger hose. I got the hose from NAPA instead of Kubota. Although the hose fit fine it seemed to me that the internal diameter of the new hose was a bit bigger. In the back of my mind I am wondering if this could be a reason why the action is slow. Maybe I have to work it a bit.

Diameter of hose should not effect the speed. Diameter of cyclinder would. Hopefully it's just air or fluid level.

 

[wushaw]

If the fittings don't have a restriction orfice then it is air, it will work out.