Kubota L35 Third Function Valve Install

[blackd]

I wondered about the TEE connection to tank. If this is true " If, for some reason, tank also has pressure, then you have a problem.", then it might be the answer to his problem. I'm not sure which valve in his system is/would caused the tank line to have pressure.

 

[Leejohn]

This is from there web site and may be it well help you guys out that understand the valve better then me.

3 Position – Double Acting Valve (Work Ports Closed at Neutral)

 

[Michael In Tennessee]

This is from there web site and may be it well help you guys out that understand the valve better then me.

3 Position – Double Acting Valve (Work Ports Closed at Neutral)

Normal. Work ports closed in neutral keeps the cylinders in position until commanded.

 

[2506shooter]

New valve arrived today and I got it installed. Same deal. Pressure on both work lines through the new valve but both the FEL and backhoe work correctly. Seems to be feeding back from the tank.

I disconnected everything and only hooked up the new valve. Pressure straight from the pump, removed the PB sleeve and capped off the port, and connected straight to the return line. Again, same deal, pressure on both lines.

I have no idea where to go from here.

 

[Michael In Tennessee]

Absolute dumb question...Do the ends of solenoids move and hit your bracket? Not sure if that valve does that. Mine does not have visibly moving parts.

 

[LouNY]

As a temporary test can you disconnect from the tee you are using for the return,
and run a temporary line from the 3rd function return directly into the tractor.
It could be that the tee connection is restricting the return flow and causing a back feed.

 

[2506shooter]

Absolute dumb question...Do the ends of solenoids move and hit your bracket? Not sure if that valve does that. Mine does not have visibly moving parts.

It doesn't have any external moving parts.

 

[2506shooter]

As a temporary test can you disconnect from the tee you are using for the return,
and run a temporary line from the 3rd function return directly into the tractor.
It could be that the tee connection is restricting the return flow and causing a back feed.

Did that this afternoon. When I separated itout everything was run straight with no Tee. No change

 

[2506shooter]

Success!
Decided I would replace the return hose so I had one made yesterday. Was able to get it installed this evening and it works! That was one of the few original hoses left on a 1999 machine that had a rough life before I retired it and have been using it around the house. I'm assuming it partially collapsed inside but I'm not sure.

Thanks for all the ideas and replies!

 

[Michael In Tennessee]

Wow! What a strange end to this adventure.