Splitter valve return

Now that my splitter is running nicely, I wonder if it has a return function that maybe just needs adjusting or a new spring. It has never retracted on its own since I've owned it. I bought it used in non working condidtion. Its a Brand valve. There is a allen key behind the lower part of the lever on the body of the valve. Anyone have experience with these models?

From what I can tell from the picture it does not look like a detent valve. Hope this helps.

Agreed, I don't see a detent adjustment on that valve.

The detent is located inside the cap directly opposite the handle. It is factory set. Could be worn or have a broken spring.

Could also just be a return spring in there. Detent adjustment is usually a large hex that protrudes at 90deg to the spool axis.

How does the cap usually come off? Friction fit, screw?

LOL I like Jags approach
Take movable parts off to see how it works, or should work, or what's broke .
Worst is you buy a new valve

Detent assembly similar to yours.
. This will provide some basic info.

http://www.energymfg.com/pdf/36403x.pdf

It does resemble this. After dissasembly mine seems to be working as it was designed.