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Calling ALL Hydraulics Guru's!


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#76 ducky OFFLINE  

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Posted November 20, 2016 - 01:03 PM

This valve I'm using has an adjustable relief.

Yes you need that relief as well. It should be set to 1000 PSI for implement relief.

The 30-90 PSI relief is internal to the hydro and is located in the Pintle Assy Plate.  All the return from the valve goes over this relief except for internal leakage of the high pressure side of the hydro.

I also upload another manual that will help you understand the hydro Description and Operation.

http://gardentractor...-and-operation/

 

There are 3 Eaton manuals in the trans section, this being one of them, that you may want to down load and read.


Edited by ducky, November 20, 2016 - 01:05 PM.

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#77 KennyP ONLINE  

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Posted November 20, 2016 - 01:30 PM

I have most all the Eaton manuals I can find.



#78 ducky OFFLINE  

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Posted November 20, 2016 - 01:32 PM

I have most all the Eaton manuals I can find.

Good deal let me know what you find when you get at those tests.


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#79 KennyP ONLINE  

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Posted November 20, 2016 - 01:57 PM

Good deal let me know what you find when you get at those tests.

I also have another Eaton off a YT!



#80 ducky OFFLINE  

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Posted November 21, 2016 - 12:56 PM

If I miss your reply just give it a bump.


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#81 KennyP ONLINE  

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Posted November 21, 2016 - 02:09 PM

I'm here, Don! Just got done with some tests and it looks like the valve is the culprit. I opened the line to the valve and fired it up (after warming). Pressure dropped to nearly nothing. Broke it loose at the filter as that is the next available spot (after hooking up the first break and letting it run for a bit). Pressure was back up (about 300 PSI, what it started with after warming). Went back to the return side of the valve and took that apart. Put another hose there to get it into the bucket. Pressure still around 300 (fast idle). So the restriction is in the valve. Same issue as I had with the MF 1855 2-spool valve as it was doing the same as this one.

The fluid I am using is comparable the JD J20C fluid. Here's a basic layout of the system.

ScreenShot065.jpg



#82 KennyP ONLINE  

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Posted November 21, 2016 - 02:24 PM

I have tried another single spool exactly like this one and it does the same thing. So I am at a loss to why the pressure is so high going through the valves.



#83 KennyP ONLINE  

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Posted November 21, 2016 - 03:04 PM

I went searching for anything about the valve I could find. The valve is what Jacobsen used for the front hydraulics add-on and also what the later Gilson units used for a lift valve. I had a service manual that I uploaded here. On page 67 starts a test procedure for this valve. Note that the hydro is still the Eaton 11 pump. They say if the charge pump will produce 800 +/- 50 PSI things are cool. If the valve can hold that 800 PSI it is good. At least that is what I get from it. Nothing is said about the system pressure when the valve is in neutral unless that is elsewhere in the manual.



#84 ducky OFFLINE  

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Posted November 21, 2016 - 03:07 PM

It sure does look like the Valve. I have never seen that issue before on a Snapper or Massey.

Check that both spools are in neutral.

Take valve back apart and inspect the inerds to see if you can see any restriction in the valve, look at the spools to be sure they are not blocking any passages and then re-verify correct assembly.

I do not believe you can swap the spools from one section to the other but check that to.


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Posted November 21, 2016 - 03:09 PM

Also, the cylinder I am using is from the same LGT 17 unit.



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Posted November 21, 2016 - 03:24 PM

It sure does look like the Valve. I have never seen that issue before on a Snapper or Massey.

Check that both spools are in neutral.

Take valve back apart and inspect the inerds to see if you can see any restriction in the valve, look at the spools to be sure they are not blocking any passages and then re-verify correct assembly.

I do not believe you can swap the spools from one section to the other but check that to.

I won't take the MF valve apart unless I can find a complete kit for it. Right now all I am finding are the o-rings for the spools. I am beginning to suspect the geometry for my 3-point is off and causing the cylinder to bind causing the back pressure and leaks.



#87 ducky OFFLINE  

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Posted November 21, 2016 - 03:26 PM

Lets stay with the Massey/Snapper valve as it comes apart in section and much easier to follow the oil flow and see that the spools are in neutral.

 

Does the cylinder move at all?  Can it be move manually?


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#88 KennyP ONLINE  

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Posted November 21, 2016 - 03:32 PM

Lets stay with the Massey/Snapper valve as it comes apart in section and much easier to follow the oil flow and see that the spools are in neutral.

 

Does the cylinder move at all?  Can it be move manually?

Yes. But I moved it's mounting point (to the 3-pt) closer to the pivot due to the cylinder travel. I may need to move that point further back out so it doesn't have to work as hard. May loose some lift height but if it works, so be it.



#89 ducky OFFLINE  

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Posted November 21, 2016 - 03:42 PM

That should be ok for now till we fine the problem with the valve.

Another thought - take the 2 lines off the valve that go to the cylinder and start the tractor.  If the spools are in neutral you will not get any oil flow from those 2 fittings or very very small amount.  Check that on the capped spool also.



#90 KennyP ONLINE  

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Posted November 21, 2016 - 03:45 PM

That will take a while Don as I have the single spool on there right now. I'll PM you.






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