Pressure testing difficulties

[Tx Jim]

I am sorry that you disagree with the facts. If I max out a cyl on a remote valve, then that relief or the FEL relief will activate. So now when any valve on the tractor that max out a cyl, the FEL relief will activate.

WHAT FACTS ACCORDING TO J_J? I disagree that a rear remote cylinder on a SCV can cause a FEL relief valve to OPEN. If 3 pt is overloaded will your so called FEL relief MASTER valve by pass? NO. Does this also mean when you continually spell gage incorrectly that it is a fact when in reality Websters Dictionary states it's correctly spelled GAUGE?

 

[J_J]

You should know better, but I forgive you.

Try this, add 3 relief valves in a series flow path with a hyd source and a gate valve in between each reliefs. Tie each relief out hose to tank.

Set the first relief at 2950 psi, the second relief at 2975 psi, and the third relief at 3000 psi.

Now close off the third gate valve and then tell me. Answer: the first relief at 2950 psi

Now, close the second gate valve and tell me which valve will relieve. first relief valve at 2950 psi

And so on and on.

Will the second and third relief valve ever relieve?

If you think I am wrong, lets hear your theory.

You can set the relief the same or different, but the lowest setting relief valve upstream will activate.

If all the relief valves are set the same, the weakest relief valve upstream will activate.

Actually, if the FEL has a relief valve, the rest of the valves, remote, BH, 3pt, they do not even need a relief because the FEL relief is doing all the relieving.

What were you going to say.

And yes, that is according to me, so prove me wrong. You should know I don't mind being wrong.

I can even fix wrong.

 

[J_J]

bumperm,

Which BH do you have?

On your tractor, B3350, if you have loader valves installed, you will then have two relief valves.

Your BH may have another relief in the front end of the valve. Some BH also have work port reliefs.

Your BH77 BH has at least 6 work port relief valves.

 

[J_J]

WHAT FACTS ACCORDING TO J_J? I disagree that a rear remote cylinder on a SCV can cause a FEL relief valve to OPEN. If 3 pt is overloaded will your so called FEL relief MASTER valve by pass? NO.


[ ACTUALLY, YES IT COULD ]



Does this also mean when you continually spell gage incorrectly that it is a fact when in reality Websters Dictionary states it's correctly spelled GAUGE?

SO TRIVAL. I ALWAYS SPELL IT LIKE THAT, SO LOOK FORWARD TO IT.

 

[Tx Jim]

You should know better, but I forgive you.



Actually, if the FEL has a relief valve, the rest of the valves, remote, BH, 3pt, they do not even need a relief because the FEL relief is doing all the relieving.

What were you going to say.

And yes, that is according to me, so prove me wrong. You should know I don't mind being wrong.
.

J_J
Actually I don't have to prove you're wrong but you need to prove you're right which of course you're not going to. This is very similar to you stating you will continue to incorrectly spell the word "gauge". You're correct about you being wrong sometimes but I know you won't admit it very similar to your continued incorrect spelling of a word. You've already read my theory in that the FEL relief valve isn't the master relief valve so have a nice night in Florida.
Jim

 

[J_J]

Jim, set your 3pt relief valve to 2500 psi, and set the FEL relief valve to 2450 psi, and then raise the 3pt to max.

The FEL valve relief will feel the pressure first at 2450 psi and start relieving. The 3pt relief valve can't relieve as the FEL valve has already done it.

If you put your ear to the FEL valve, you will hear it relieving. If you remove the OUT hose on the FEL valve, you will see fluid flowing.

Need I say anymore?

By the way, the books don't say anything about a master relief.

However one should realize that the valve that does most of the pressure relieving is in charge. Guess which one that is.

 

[Egon]

Gage?

If you want to check pressure a gauge will work much better. But, in certain circumstances, a gauge might be refered to as a gage but it likely has nothing to do about measurement.

 

[Tx Jim]

J_J
OK on my '11 Kubota M7040 with a Kubota LA1353S FEL the feedback rod was set incorrectly so as when the 3 pt was fully raised the 3 pt continued trying to raise. The relieve valve that opened was the 3 pt relief valve not the factory FEL relief valve. No I did not install a "gauge" but used a laser thermometer to determine the heat differentiation plus the sound of the by-passing valve. I wouldn't alter my tractor's factory set relief valves while tractor is in warranty anyway. After adjusting feedback rod noise and heat at rear of tractor disappeared.. Are you trying to state that on a Kubota tractor that FEL relief valve should come from factory set at a lower setting than 3 pt relief valve.?????????????? If the books don't mention MASTER RELIEF then this wild idea must be YOUR THEORY !!!!!!!!!! Did you ever research the differences in CC & CCLS hyd's?
Jim

 

[skyhook]

Thanks for the vid, Kennyd,,
very informative for those of us who get lost in hydraulic testings,:thumbsup:

JJ, or Kennyd....
What I am understanding here is,
if I have a backhoe attached in the power beyond circuit, I should disconnect it and re-connect the 3 point for a pressure test of the loader, just in case the backhoe reliefs kick in before my hydraulic block does?
Take a reading, then re-connect the hoe....
if the readings change with the hoe connected, I should adjust the hoe's relief, slightly higher than the hydraulic blocks?
Assuming I can find the relief vale on the hoe.

In other words, if my backhoe's relief is set "lower" than the hydraulic block's, it could very well be the reason
my loader is going into relief before it should while the hoe is attached..

 

[bumperm]

Okay, "gage vs. gauge" notwithstanding, there's clearly some confusion going on here . . . I only have a few active brain cells left, so don't want them all in a tither over this :c).

On my B3350 and BH77 hoe: with the hoe off, there's a "power beyond" hose to plug into a fitting on the tractor, this is part of a series loop, dumping the hydraulic fluid back into the reservoir (if I understand this correctly). Routing this hose through the backhoe doesn't change a thing, as long as no valves are moved on the hoe . . . the fluid simply routes through the hoe and back to the tractor's reservoir, right? When one moves a lever on the hoe, then the fluid gets pressurized as it's diverted into a cylinder to do work. Any relief valve on the hoe itself, will only bypass back into the original hose going to the tractor's reservoir - - it would thus have no bearing on any work (pressure build up) being done by any other hydraulic cylinder on the tractor. A relief valve on the hoe, if set lower than the main relief valve on the tractor, would not bypass before the tractor mounted relief if the hoe was not in operation (i.e. the hoe itself, when not being used, is bypassing all the fluid back to the tractor and thus experiencing no pressure build up to speak of).

If this ain't the case, I'm lost!

bumper