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I'm back with another hydraulic question.

L

L.Fure

Well-known Member
I decided to buy a hydraulic valve for my 340 loader that had a float setting. Now picture this; looking at the hydraulic valve from the top. On the left side is the in port that comes from the hydraulic pump. On top of the valve body is the four work ports that goes to the cylinders. Now on the right side there is an out port that is called the power beyond port that goes to the control valve, in front of the shift lever, that controls the fast hitch cylinder. Then on the right side there is a return port that goes to the hydraulic reservoir (transmission). My new valve has all of this, but in order to use the out port as a power beyond port I have to purchase a power beyond sleeve to make this work. My question is, why can't I plumb the pressure hose for the fast hitch into the hose from the pump that attaches to the left side of the hydraulic valve?
 
You can't plumb into the "input" side and make it work, because it's an "open center" system, meaning when the valve spools are centered, the oil is constantly flowing through the valve from pump to sump. There is virtually no pressure on the input port until you move a valve spool to push a cylinder ram. The "power beyond" option takes the return port and allows any unused flow to be used on any remaining open center valve spools in the system, such as your fast hitch. This is called a series connection. Trying to put two open center valves in parallel won't allow either to work, as there will always be a loop flowing to the tank from one or both valve blocks.

Hope that is a bit more clear than mud.
 
Yes, that makes perfect sense the way you explained it. I'm just trying to get this project done without having to send for another part. If I didn't have to use the power beyond port I would just leave the #12 SAE plug in the hole and use the three quarter inch port for the return. But as it is I would have to order a power beyond sleeve to use the power beyond port. The picture of this sleeve doesn't look like anything special to me. I wonder if a #12 SAE male to 3/4 NTP fitting would work for this purpose? Something like this I probably could find locally.
 
Without seeing the valve first hand I can only offer a guess. What the sleeve probably does is change the internal porting of the valve, otherwise the 'dump' side of the valve spools and the 'power beyond' tap both connect to the 'return' (tank) port. I'm fairly certain that the sleeve is a precision machined part specifically for that make and model of valve.

Much as you'd like to get-er-done, this is one place you have to get it done right, so order the part. If you aren't using the fast hitch at the moment, you can cap the open side and leave it out of the circuit. At least you'll have the loader available to move snow if needed until you can get the sleeve.
 

You're right, I just need to be more patient. I really don't need to get this project done right way. I just wanted to play with my new toy and now have to wait. :lol:
 
The power beyond port is designed to withstand the high pressure generated when you actuate the fast hitch. That high pressure "backs up" through the system back to the pump.

The return port is not. It MIGHT hold up, but I've heard of people splitting valve bodies on valves that did not have power beyond. I would imagine the return port on a valve with power beyond isn't any stronger.

On a low pressure system like this it probably won't be a problem, but why take the chance for wont of a single part?
 
I just ordered the power beyond sleeve for this valve. This has been a learning experience for me. I like learning something new from time to time. It makes life interesting.
 
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