Just Discovered that Pump Out and Power Beyond hoses to Loader Reversed at Block ???

[WranglerX]

In a open valve, series system its always after pump and first valve body "power in" (P), its usually then from "power beyond" (PB) port to next valve body "power in" (P) port and so on through each successive valve body till it gets to 3PH which is usually last hydraulic mechanism in system... At least this my understand of general hydraulics...

Dale

 

[Gordon Gould]

What are you calling a hydraulic block? I do not see one listed on parts illustrations.

It is easy to get confused when hydraulic components are connected together.

One valve's IN is fed by another component's OUT.

I have been told by Cross Manufacturing's tech specialist if that if the P (Pump out) and PB hoses are swapped the valve will not operate properly.

No, it will not operate properly. When the spool is shifted the Power Byd is blocked.

Thanks, Jeff


I doubt you have circuits improperly connected. Only change them after great study. In hydraulics, expensive components are destroyed in fractions of a second. It is not a "Lets try and see what happens," world.

Dave M7040

Thanks for the warning Dave. I looked at this long and hard before I came to the conclusion it was incorrect. I'm no expert but know the basics and have done several Hydraulic mods on tractors and dozers. I have a tractor op manual which shows and explains the hydraulic block and valve position when a loader is added and I have the loader installation manual. Both agree in illustrations and wording that the lines are swapped at the block.

Your statement about the blocked PB port just adds to the mystery. I am not going to do any thing I can't undo and I understand the potential for damage.

gg

 

[K5lwq]

Gordon, could you take some pictures of what you are seeing? I am not understanding how it has been fine reversed all this time.

 

[Gordon Gould]

If I am wrong now is the time for me to find out ! So I appreciate all the help.

OK here is a 2 minute video tracing the flow direction from pump out on the block to PB return to the block. I think it is reversed. Then there is the loader operating.

M5640 Hydraulics Reversed - YouTube

Here are some pics. Hydraulic Block - Green is pump out



3rd Function valve - Green into Power Out



In front line goes from Power in marked P on 3rd Func to Loader Valve PB out



Yellow on Loader valve is Power In and goes back to The hydraulic block Power Beyond in (see pic 1)



A couple from the two manuals





So what do you think ?????

gg

 

[ptsg]

Great video describing all the routing Gordon. Along with the pictures, it helped tremendously figuring this out.

From your description and following the hoses, it does indeed look like the green and yellow are swapped. The good thing is that the loader valve is hooked properly, it's just not on the right order. Should be loader valve then 3rd function.

The green line should go on the In port of the loader valve. The PB line from the loader valve will feed the P port of the 3rd function. The T/Out port of the 3rd function will go back to the PB port of the hydraulic block.

Regarding the functionality of the system. I don't think you won't notice anything after the changes but the system will be better protected this way. If anything, the 3rd function won't get flow until you have the loader valve lever in Neutral.

On a side note, the Tank hose on the loader valve (4rd picture) is rubbing very hard on the mount. You may want to loosen the 45 degree fitting and rotate the hose slightly so the mount doesn't cut the hose open.

 

[Gordon Gould]

Well I solved the mystery. It turned out to be the only thing that would make all the info and knowledge from you guys correct and me looking foolish.

I took off my small belly pan and cut all the tie wraps securing the hoses inside their sheath to the tractor bottom. I removed the Green hose from the hydraulic block then loosened the green hose at the 3rd func valve so I could rotate 180 for it's new connection point on the block. It wouldn't rotate. Started pulling on hoses. What the flip - The Green hose has Yellow tape on the other end and the Yellow has Green. The joke is on me. All I need to do is swap the tape on one end.

Thanks for the support and sorry to be a bother. In hind sight I should have taken the bottom off first and removed a hose end so I would be sure.

gg

 

[K5lwq]

Lol now it is making more sense. Don't feel bad, we all have done something like that before. :thumbsup:

 

[Gordon Gould]

Thanks ptsg, good eye on the tank hose. It had a pretty good notch started from that corner. Moved it away. So I gained something in this exercise.

gg