pressure testing a power beyond sysrem

[BMWMIKE]

I have a 1995 Kubota B 7100 HST and I want to test the hydraulic relief valve pressure. How do I do that on a power beyond system with out dead heading the pump? On the FEL I think I should take one of the lines ( either the lift or the curl) loose at the valve and put my gauge there, and this would give me the relief valve pressure setting for the FEL (is this the correct way to do this)?

How do I check the pressure on the three point relief valve, with out dead heading the pump? I know their is a valve under the seat that can be swithed to run a rear implement, but if I don't have a return line won't I be dead heading the pump?

Can someine tell me where (better yet a Picture) of where the relief valve is on the three point for this tractor, and where to put the gauge. What is the pump pressure and what pressure the relief valves should be set at?

Sorry to make this so long, but I wanted to tell everything I think I know so some one can tell me the correct way to do this. I am mainly interested in testing the three point pressure.

mike

 

[J_J]

If you have QD's, just plug in the gage and activate the lever for that valve momentary. This will cause the system to develop pressure and the pressure if greater than the relief pressure, it will be relieved.

If you want to constantly monitor the pressure in your hyd system, just tee in a hyd gage in the IN port of the first valve.

To test the 3pt, with the gage in the IN port of the first valve, just raise the 3pt to max and the relief will activate and relieve at the set pressure.

B-7100HST
Look at control valve items 30 to 120 3pt relief

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[J_J]

The way to deadhead a pump is to block off the flow of fluid from the pump. In an open center hyd system, the fluid is flowing all the time, and is only building up pressure when you activate a valve or steering.

So in order to test the pressure, you either tee in a valve in the flow path before the first valve or plug the gage in the QD and activate the lever for that port.

If the gage is in a tee at the IN port of the first valve, the gage will reflect the pressure, anytime the components are developing pressure such as a cyl extending, or a hyd motor is running.

By holding the lever until the cyl is at max, you will test the pumps ability to pump fluid at least up to the relief pressure setting.

Your pump pressure and relief pressure setting should be in your manual, or call the dealer.

 

[RickB]

I have a 1995 Kubota B 7100 HST and I want to test the hydraulic relief valve pressure. How do I do that on a power beyond system with out dead heading the pump? mike

You can't.

 

[J_J]

You can't.

You can't what.

 

[RickB]

You can't what.

He asked how to test his relief valve without deadheading his pump and I told him he couldn't.
The question was contained in a quote and my answer followed.

 

[BMWMIKE]

JJ, and Rick,

Thanks for the Information. I don't have QD's on the rear of the tractor. I do have a valve under the seat that when opened cut off flow to the three point and sends flow through the valve. What if I put a QD there with a pressure gauge and only open the valve part way, so I have flow both ways. Then raise the three point all the way up.

What do you think would this work?

mike

 

[J_J]

What kind of outlets do you have on the hyd block?

Do you have draft control?

Can you cause the 3pt to go into relief by raising the lever all the way up?

 

[J_J]

Does your FEL get it's hyd fluid from the hyd block? If it does, you can tee at the hyd block and read the pressure for the 3pt relief valve by

You only need one relief in an open center system, and with no attachments the tractor only comes with a 3pt relief. After you add the FEL, the FEL relief becomes the PRV for the system.

Don't know where you were going with the power beyond thing, but that is a fitting that carries the fluid downstream. Whether it is used or not, you will have fluid flow downstream to the 3pt.

Don't know what RickB was implying, but if there is an adjustable unit in the tractor, you should be able to check it and adjust it.

You usually set all the reliefs the same, and one or the other will relieve. However you could set the 3pt higher by 25 psi, and the FEL relief will activate, and relieve the system.

You could distinguish which relief was relieving by setting the 3pt relief lower than the FEL relief. With the FEL relief setting at 2500 psi, and the 3pt set at 2475 psi, and you maxed out the 3pt, you would see the 2475 psi which is the 3pt relief.