How do you adjust a hydraulic valve?

[Junkman]

Re: How do you adjust a hydraulic valve? *DELETED*

OK.. here is the skinny.... it appears that this is the correct way to set the auxiliary valve if you want to use just two hoses. I have it on good authority from the Central Division Kubota Technical Representative that this is the way that some dealers would plumb it and that it is perfectly acceptable method if you don't need full hydraulic pressure to the cylinder.
Having said all that, I have also figured out a way to use the power beyond to power this valve and to plumb it with the three lines so it will be fully functional with full pressure to the cylinder.
Now getting to the next topic.... the valve. Yes, I am beginning to realize that you are having second thoughts about taking me into you family with the impending marriage of your old maid daughter and the proposition that you suggest that you would make it financially worthwhile for me to consider the union. I also am having second thoughts since you seem to be reneging on most if not all the promises that you have made. I know that there are going to be a lot of TBN members that are going to be very disappointed to not be able to attend the festive event that you had planned for your pole barn.
Getting back to the valve........ the basic engineering is completed and not it is onto the prototype steel modification work. Unfortunately, my pole barn is late in getting started, so I am still working out in the cold. You wouldn't happen to know where the deposit check is in the mail, would you????? /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

 

[Steve_Miller]

Re: How do you adjust a hydraulic valve? *DELETED*

Junk,

Have you been drinkin' again? /forums/images/graemlins/grin.gif /forums/images/graemlins/tongue.gif /forums/images/graemlins/blush.gif /forums/images/graemlins/smile.gif

Steve

 

[rswyan]

Re: How do you adjust a hydraulic valve? *DELETED*

</font><font color="blue" class="small">( That's correct John and I can also recommend an excellent place for Junk to stash it. Eouch! )</font>

Yeah, but continued operation of it may be a problem ....... unless he's double-jointed /forums/images/graemlins/shocked.gif

 

[bugstruck]

Re: How do you adjust a hydraulic valve? *DELETED*

With all the good theories on Junk's hydraulics I couldn't let this thread die on that kind of restriction. /forums/images/graemlins/shocked.gif

 

[Junkman]

Re: How do you adjust a hydraulic valve? *DELETED*

I went to the proctologist today and he said that I am healing well. It was about a 3 hour surgery to remove what took about 3 seconds to place. You TBN guys sure do play rough, but I am tough and can take it. /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

 

[PineRidge]

Re: How do you adjust a hydraulic valve? *DELETED*

<font color="blue"> You TBN guys sure do play rough, but I am tough and can take it.
</font>

I'm glad everything worked out all right cause as far as I'm concerned we're going to give it to you again. /forums/images/graemlins/smile.gif

 

[Henro]

Re: How do you adjust a hydraulic valve? *DELETED*

I just want to take this opportunity to pat myself on the back, as I just read this tread again from start to finish, trying to understand EVERYONE's contribution....

My head is still spinning....

But I think we still need to come to the conclusion as to why Junkman would measure 1,500 PSI on his CC valve hose when the tractor engine is running at full RPM.

That soulds like about 75% of max system pressure.

Too high to make me feel comfortable...

 

[WhiteRock]

Ok, I'll poke at this campfire a bit.. /forums/images/graemlins/smile.gif

There may have been a bubble or drop of water on the meter and it really read 150... /forums/images/graemlins/blush.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/confused.gif

 

[mopacman]

I just put a pressure gauge in line with with pressure line from the pump on my TL3200, I found with the three point hitch rased up and full throttle I have 1000 lb of pressure on my gauge. there must something in the tph that is active all the time because my tph does not leak down when the tractor is running....Larry

 

[WhiteRock]

That is interesting data. I don't know much about your tractor, but if it's hydraulic flow is 4 GPM (that is what the BX is,) it is using about 2.75 HP as long as that condition exist.

I have a B7500. When I raise the hitch, I can hear the engine load up. If I leave it all the way up, the engine remains loaded up. Also in this situation, my FEL will not work properly. I have not looked at it's design, but this is what I think is happening. In the up position and the lift at max height, I think the system relief valve is being activated. Also the PB from the FEL feeds the 3pt hitch. When the 3pt activates the relief valve, there is minimal delta pressure across the FEL valve to operate the FEL.

I have to pull my 3pt level off at max height for proper operation.

Could it be that something similar is happening on your tractor?

 

[MMM]

</font><font color="blue" class="small">( system relief valve is being activated )</font>

I can't imagine that either. There's usually an unloading valve that allows much more flow.
I admittedly don't know much about more modern tractor hyd systems, but on the older ones, when position is reached, system switches over to low pressure. There would only be a constant pressure if serious lift piston leakby was involved. A major case of hiccups in other words. Also when max height on pos control is reached it also switches to low pressure. If pos control is out of time with rockshaft, screwy things like mentioned on this thread happen.
Does your loader struggle to maintain position also? This is all quite interesting and I wonder at the design of it if not malfunctioning.

 

[WhiteRock]

No, my loader doesn't struggle. It actually works quite well and is very fast as long as the 3pt doesn't come into play. When I first got the tractor, I had a limb knock the 3pt lever in the up position. I thought I had broke my tractor. I looked and looked. I figured it out on the way back to the house.

To clarify, the 3pt hitch on this tractor is not modern. /forums/images/graemlins/frown.gif It is a cost reduced implementation. It is not a position control lift. Your description matches what I have seen of position control. This is more like a spool valve with no return to center and no cancel. I know, don't ask me. I can't believe they saved that much money. It is usable once you get use to it. If you never used PC, you probably wouldn't notice.

 

[Henro]

<font color="blue"> When I first got the tractor, I had a limb knock the 3pt lever in the up position... </font>

WhiteRock,

I thought on tractors without position control there was a linkage to return the 3PH lever to center when the hitch reached top position.

I know on my BX this happens (at least most, if not all the time).

Actually the BX manual states: "Hydraulic control lever is automatically returned to neutral position when the implement is raised at top position or down at lowest position."

I would suspect that your tractor (I know it's not a BX, but still should work the same I think) needs a minor adjustment to the linkage

 

[MMM]

I goofed in not remembering your loader ran off a separate valve. From the symptoms it sounded like it was run from remote banks.

 

[MMM]

Henro, then is it safe to say Junkman's (BX22) lift is same as yours and could possibly be maladjusted also and creating the constant system pressure?

 

[Henro]

<font color="blue">Henro, then is it safe to say Junkman's (BX22) lift is same as yours and could possibly be maladjusted also and creating the constant system pressure?
</font>

I guess that could be a possible explanation for why Junk measured such a high pressure...

But knowing how much effort Junkman puts into keeping his tractor and other equipment in top operating condition (impression I get from reading his posts) I would doubt that to be the reason.

Now if the lift lever were somehow moved into the raise position, and something kept the hitch from raising all the way to the point where the linkage would shift the lever back to neutral, that could have the same affect...

I guess we'll have to wait for a response from him on that one. /forums/images/graemlins/smile.gif

 

[Junkman]

All levers were in there neutral position. My 3 pt hitch lever always returns to the neutral position and my loader valve has never had any problems associated with it. This is as puzzling to me as it is to you. When warmer weather arrives, if it ever arrives, I will put the loader back on the tractor and then take readings again. As for anything being maladjusted, I don't believe that anything on the tractor is maladjusted, other than me..... /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

 

[mopacman]

When I tested my iseki TL3200 tph pressure I had a two bottom plow on it. My pressure with the plow sitting on the ground 500lbs less. With plow raised up and the engine at full speed was 1000lbs and at idle it is 700lbs. This is what I found tonight when I retested it....Larry

 

[WhiteRock]

Does your tractor have position control 3pt hitch?

 

[mopacman]

Yes but i dont know how to use it. I have not had time to play with it....Larry