I was still not sure what that adjusting screw was for until Larry (gugliols) replied that he had the same question. He has a Jinma 354 with the same 1/2 remote and mystery adjusting screw like mine. This is what he told me:
Rob,
That "remote" capped off output on the left center of the TPH box is whats called a 1/2 remote. It can be used for a single acting cylinder (one hose going to the cylinder). So you only get power in one direction and gravity return. It can be used on a simple dump trailer cylinder. It cannot be used for double acting cylinders. Fluid is pumped out that one remote when you lift the TPH lever then returns back though the exact same port by gravity when you lower the THP lever.
Trouble is, in order to get that 1/2 remote to work you loose the function of the TPH arms. Unless you have a single acting cylinder dump trailer - that "remote" is pretty much worthless.
The "Mystery" bolt on the left MAY be what we turn to activate it ?
Then he got his manual out and read that the adjusting screw was to engage the 1/2 remote.
Rob,
Ok just read the Chinenglish operators "manual".
My version:
...the "mystery" Bolt is indeed what activates the 1/2 remote.
Screw it in (CW) will allow the TPH position lever to control fluid in & out that capped off 1/2 remote output. Screw it out (CCW) to restore normal TPH operation.
If we were to screw that bolt in with the 1/2 remote capped off, then raise the TPH lever we might just "dead head" the pump and blow it up.
So you un-cap the 1/2 remote elbow and turn the adjusting bolt clockwise to use the 1/2 remote. Then you can use the 3pt raise and lower lever to run the 1/2 remote. Turning the bolt back counter clockwise would again activate the 3pt raise and lower. But don't cap it off without screwing the adjustment counter clockwise and pull the 3pt levers, or it might deadhead the pump.
Well, I was not planning on using mine before, but now I want to.
My questions are:
1) Is there no relief valve for the 1/2 remote in case we forget to turn the adjusting screw counter clockwise?
2) Can I put a quick disconnect on the end of that elbow and leave it on?
3) Has anybody actually used this feature?
4) Can you tell me how far to turn the adjusting screw in (clockwise) to make it work. Does it go to a stop or something?
5) Then how far out (counter clockwise) to make the 3pt work again? If I unscrew it too far, will it fall out?
Thanks in advance,