Leaky Control Valve

[rScotty]

I don't know if Kubota carries it, since it was an add-on WR Long bucket they put on when I bought the tractor, new in 2004.
I spoke to someone at Hyvair and he said beyond checking the spool for trash, there isn't much I can do. I checked the spool and it's clean with no visible wear.
He said one option, besides a new valve, would be a pilot check valve I could add on if I wanted no leak-down. I am investigating that now. So far, that would be about 102, and I can add it to my current valve, since it is already leaky (something about how the pilot valve works that if I got a new main valve, I would have to use a different main valve with the pilot valve).
View attachment 880273
Chris

Nifty stuff. Thanks. I was hoping you would take it apart. Unfortunately, all of these sliding valves have to leak to some extent just because they have to have some clearance in order to operate. I see on the spec sheet for that valve that they have a specification for leakage. Yours might even be in spec !

I agree with the tech that the only way to absolutely stop leakage is an on/off valve. In fact, if the grapple is holding compressive force or working against gravity then you could use several of such valves- at least one in the feed and one in the return.

An alternative would be solenoid valves if you don't mind taking the extra step to engage them.

Nice to see the innards. Frankly that valve looks like a nice piece of design to me. What did you think of the assembly?
rScotty

 

[TORQUIN]

I think I will upgrade to the pilot check vale when I can afford it. It sucks when I am carrying a power pole or log, for the clamping force to slowly release and drop the pole.

Chris