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Calling ALL Hydraulics Guru's!


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#46 olcowhand OFFLINE  

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Posted November 18, 2016 - 07:45 PM

Kenny, I haven't ever ran a pressure test on a hydro before, so I'm not able to help.  


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#47 KennyP OFFLINE  

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Posted November 18, 2016 - 07:59 PM

Been looking for Keith to chime in. Haven't seen him online for a bit.



#48 shorty ONLINE  

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Posted November 18, 2016 - 11:43 PM

I haven't played too much with hydraulics yet. Nothing to help you.
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#49 Alc OFFLINE  

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Posted November 19, 2016 - 06:06 AM

Kenny I wonder if there's a allen plug in the return section that needs to be tied to the return hose like Keith mentioned before ? Do you remember seeing anything like that ?
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#50 KennyP OFFLINE  

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Posted November 19, 2016 - 06:06 AM

I'm wondering if the geometry is off where the cylinder hooks to the 3-point. That could cause a bind.



#51 KennyP OFFLINE  

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Posted November 19, 2016 - 06:26 AM

Kenny I wonder if there's a allen plug in the return section that needs to be tied to the return hose like Keith mentioned before ? Do you remember seeing anything like that ?

None that I have seen anywhere. The whole system is plumbed just like a Ford LGT, which is what it all came from.



#52 Alc OFFLINE  

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Posted November 19, 2016 - 06:43 AM

This may or not work, I think you have enough system pressure to feel movement , but if you could have someone operate the control while you have your hand around the hose you should feel that hose change go back between the two if only one feels different the other shouldn't becaues it should be the return to tank . It might in your trouble shooting .

#53 KennyP OFFLINE  

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Posted November 19, 2016 - 07:24 AM

I just looked in the Ford Service manual and they want the gauge hooked into the rod end of the cylinder. I can do that at the valve, just real cool out there. The relief in the valve may be an issue.


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#54 KennyP OFFLINE  

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Posted November 19, 2016 - 10:10 AM

Well, I just found something. The parts list calls for a restricted fitting at the valve for one side of the cylinder hook up. See below.

ScreenShot061.jpg

 

I bet I need that in there!


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#55 UncleWillie OFFLINE  

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Posted November 19, 2016 - 11:57 AM

might just

#56 ducky OFFLINE  

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Posted November 19, 2016 - 04:04 PM

Here is what it shows at full throttle.

attachicon.gifDSCN2397.JPG

 

Kenny this reading should be 50 psi MAX at high idle. This is causing you leaks.

 

 

And here is what I get when I operate the lift handle.

attachicon.gifDSCN2399.JPG

 

This reading would be correct if the cylinder is deadheaded in or out. It is the relief pressure of the pump. 1000 PSI

If the cylinder is moving you would see a small amount of pressure and this would increase as the load increases until load is so heavy you hit relief. 1000 PSI

 

 

 

At a fast idle, pressure drops to 200 and slowly climbs back to 300.

 

This reading should be minimal. Maybe 50 psi MAX just from flow resistance.  

This is why the valve is leaking from the low pressure side. This indicates a restriction in the Valve or return plumbing.

To check and eliminate the valve remove return line from valve and attach a known good line to the valve and route into a bucket.  If this pressure goes below 50 PSI the valve is good.  Now do this down the line till you find the restriction. i.e. before and after the filter and at the line were it returns to the hydro.

 

 

 

If there is a restriction, it has to be in the cylinder fittings and I will have to take it out of the tractor to get to them.

 

If the cylinder is not deadheaded yet you see 1000 psi, yes to the restriction is somewhere between the valve spool A and B fittings and the cylinder or the cylinder is seized mechanically.

 

I suspect you may have more than one problem. (Flow restriction in the return lines/filter) (Restriction in the A or B line to the cylinder or cylinder is seized mechanically)


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#57 ducky OFFLINE  

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Posted November 19, 2016 - 04:34 PM

Here is what it shows at full throttle.

attachicon.gifDSCN2397.JPG

Kenny this reading should be 50 psi MAX at high idle. This is causing you leaks.

 

Kenny I maybe wrong on this reading.  It is what you should see on a Sundstrand hydro.

Looking at the Eaton Manual It has an internal charge pump pressure relief the receives all output from the charge pump though the hydraulic return system which would explain the 300 PSI reading when spool valve is in neutral.  Let me check this on one of my Snappers with the Eaton pump.

 

One other thought are both spools in full neutral. Meaning one is not off center.


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#58 ducky OFFLINE  

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Posted November 19, 2016 - 04:51 PM

Here is the service Manual of the Eaton 11.

Attached File  Eaton 11Service.pdf   972.26KB   11 downloads


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#59 ducky OFFLINE  

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Posted November 19, 2016 - 04:55 PM

Here is the service Manual of the Eaton 11.

Attached File  Eaton 11Service.pdf   972.26KB   11 downloads

Charge pump pressure is 50 PSI so that is what the gauge reading should be when Valve is in neutral.



#60 KennyP OFFLINE  

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Posted November 19, 2016 - 05:21 PM

 

Here is what it shows at full throttle.

attachicon.gifDSCN2397.JPG

Kenny this reading should be 50 psi MAX at high idle. This is causing you leaks.

 

Kenny I maybe wrong on this reading.  It is what you should see on a Sundstrand hydro.

Looking at the Eaton Manual It has an internal charge pump pressure relief the receives all output from the charge pump though the hydraulic return system which would explain the 300 PSI reading when spool valve is in neutral.  Let me check this on one of my Snappers with the Eaton pump.

 

One other thought are both spools in full neutral. Meaning one is not off center.

 

So that 450 lb. reading I am getting is way high (in neutral)? Meaning I have a restriction in that circuit? Now I'm beginning to think the oil filter adapter may be some of that issue. I'll have to search through invoices to find the part # to check it's flow rating.

 

Found the filter invoice. Supposed to be 7 GPM. It will take most of a day to check the return system.


Edited by KennyP, November 19, 2016 - 05:29 PM.

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