Erratic Hydraulics

[wdchyd]

Has anybody here mentioned the possibility of your PB and Return lines are mixed up..??....Did they give you the right plug for the PB..??

 

[Gary Sweat]

Gary,

Just trying to catchup on this thread....Read it a couple of times and confused.......What is the original problem?..

Is it the dump cyls overrunning the pump gpm's?....

There were actually two issues going on. One was the dump cycle that I am working on correcting (still not sure how to yet) and the other is the loader does not seem to increase speed when the engine rpm is increased.

Right now I am trying to understand why the loader will not operate any faster when I run the rpm's up. Not sure if I have a problem or how to find out why it's staying the same speed. From what I have read, I should see faster movement in the loader and bucket with increased engine speed but I don't. Seems to operate at the same speed regardless of rpm's.

 

[Gary Sweat]

Has anybody here mentioned the possibility of your PB and Return lines are mixed up..??....Did they give you the right plug for the PB..??

PB and return lines are hooked up correctly. I say this based on the CV port markings and watching the gauge pressure when operating it. The PB adapter fit tightly in the hole and is the one that goes with that valve.

I will take the cap off of the return line adapter and see if any oil is flowing when the CV is in the center position, as I understand it, there should not be any oil moving through the line until I move the joystick. If there is, then that might be my problem.

Thanks for the suggestion.

 

[J_J]

Gary Sweat: Quote

I can use the 3pt and loader only if I barely open the loader valve and then both move slow. Either one by itself will move quicker. You had told me a while back that my pump couldn't support both.

I looked back and could not find where I said that. What I may have said was that if your FEL valve was using all the pump flow to operate the cyl, then for the time the cyl are operating, there will be no flow left for the 3pt. If you only use some of the total flow for the FEL, then some is available for the 3pt. The first valve upstream has priority, and will cut off or reduce the hyd flow past the first spool.

Have you played with the position of the 3pt lever such as up all the way, or down all the way, or left in the middle of travel, when using the FEL.

The flow meter with pressure gage will show the flow at any rpm, and the pressure .

 

[wdchyd]

PB and return lines are hooked up correctly. I say this based on the CV port markings and watching the gauge pressure when operating it. The PB adapter fit tightly in the hole and is the one that goes with that valve.

I'm just not that familiar with that brand of valve.....the ones I use have the PB sleeve (not plug) inline with the central pressure core and bypass the downstream flow to the 3PH (or whatever the next valve is).......You have the fitting that is inline with the pressure core going to the return to tank and the fitting that is inline with the return core of the valve is going to the 3ph....Not saying it's wrong, just saying it's different.....

I'd be suspicious....

 

[J_J]

If PB in installed and is the correct sleeve, then the only fluid coming out the return port is the expended fluid from the cyl. The normal flow would be through the valve and out the PB port. If the FEL arms are raised up, and the valve or spool is leaking, then you may see a little fluid coming out the return port with all levers in neutral.

 

[wdchyd]

The flow meter with pressure gage will show the flow at any rpm, and the pressure .

It does take the guesswork out of it.....but then again I'm spoiled and have several at my beckon call...........Too bad you're so far away in OK....

 

[wdchyd]

If PB in installed and is the correct sleeve

Maybe he has a "Closed Center Plug" installed and not a "Power Beyond Sleeve".....See Picture...!!

 

[J_J]

I'm just not that familiar with that brand of valve.....the ones I use have the PB plug inline with the central pressure core and bypass the downstream flow to the 3PH (or whatever the next valve is).......You have the fitting that is inline with the pressure core going to the return to tank and the fitting that is inline with the return core of the valve is going to the 3ph....Not saying it's wrong, just saying it's different.....

I'd be suspicious....

Look at that picture of the valve again, the PB sleeve and hose is connected to the straight through path through the valve. The return is using the top outlet . There is another return outlet on the side by the PB. Now, if the hoses are correct.

If the PB and return hoses were connected wrong, then the flow would pass through the PB port and out the return hose to tank, and the 3pt would not work.

If the 3pt works correctly and will kick in the relief valve, then we can assume it is working correctly.

Where is the relief valve on this valve. It is usually close to the pressure port.

 

[Gary Sweat]

Look at that picture of the valve again, the PB sleeve and hose is connected to the straight through path through the valve. The return is using the top outlet . There is another return outlet on the side by the PB. Now, if the hoses are correct.

If the PB and return hoses were connected wrong, then the flow would pass through the PB port and out the return hose to tank, and the 3pt would not work.

If the 3pt works correctly and will kick in the relief valve, then we can assume it is working correctly.

Where is the relief valve on this valve. It is usually close to the pressure port.

The relief valve is on the input side. When I use the 3pt all the way up I hear a relief kick in and the gauge pressure will remain around 850psi. I don't know if that is because the PRV in the 3pt is kicking in or what. The loader valve is set to 1500psi and will kick in the minute the cylinders fully extend.

When I said you had told me that the pump couldn't support both the loader and the 3pt is was because of what you had said about not having enough flow to work both. Didn't mean to misquote you, I just took what you said to indicate that was the issue.