[Dezdon]

Hello again Fedup,
I haven’t had time to work on the tractor until today.
I hate to bother you again with this, but we are still stumped with this power beyond application.
We removed the loader control valve completely off the tractor in order to read the letters in the casting of the valve body.
One port was marked “N”, the other ports that were marked had a “T” and “P”.
We assumed the T&P were tank and Pressure.
We are using the “N” port as the power beyond line, and it is connected to the pressure hose of the backhoe attachment. (we had new hoses and fittings fab’d up)
The line we removed off of the “N” port was running to the tractors relief valve under the right foot, along the frame.
We used that port on the relief valve as the return from the backhoe attachment.
The relief valve Im speaking of has the slotted screw head on it that directs flow to the loader or attachment.(?)
The LS backhoe attachment still does not respond.
The backhoe is brand new btw, it’s just been sitting around inside the garage for two years.
Here’s what we have checked and tried:
Hyd fluid levels full.
Engine rpm is brought up to around 3000rpm.
Removed return line from backhoe quick connection and have verified oil flow.
We disconnected the lines going to the loaders hydraulic rams.
We tried crossing the pressure and return lines of the backhoe.
We tried turning the screw on the relief valve. (The backhoe responded very, very little).
The bucket curled ever so slightly and the outriggers drifted downward, but won’t return.
The one thing I’m super curious about is a
“Power Beyond Sleeve”.
But I can’t find the valuable info I need to know about this particular tractor or loader valve and a power beyond sleeve anywhere online. I don’t know if that would even be needed?
My instincts says it’s a lack of pressure problem.
But I would think the current pressure settings of the tractor to run the loader, would be sufficient to run the backhoe,..that has even smaller hyd rams then the loader hyd rams.
I so appreciate you time reading this and if you have any ideas where I would from here, it would be greatly appreciated!
Thx
-Dez

 

[Dezdon]

Thanks you for your quick response.
The backhoe has two lines connecting it to the tractor.
We did indeed run the return hose back into the reservoir so we could see if the oil was flowing, and it was. We even crossed the lines to see if one line was stronger, but the flow seemed identical.
ugggg

 

[Dezdon]

Yes the loader hydraulics work. We even went so far as trying the backhoe with and without the hoses connected to the loader (via the quick connections for the loader)
My thoughts keep returning the Power Beyond Sleeve possibility. Like maybe the flow of oil ports over to a return galley inside of the loader control valve body (?)
Man, I have been all over the web searching for info on this.
The backhoe was bought new at the dealer and sat in the garage for a couple of years until the subframe connection was finally solved.
Thank you again Fedup for your time and knowledge with this problem. -Dez

 

[Dezdon]

Thank you Fedup.
I did start a new thread in search of the sleeve under the hydraulics forum.
It includes another posting from a similar situation.
Thanks again Fedup.
-Dez

 

[Dezdon]

**SOLVED**
Thank you everyone for your posts, especially Fedup, thank you for your time and patience, you were extremely helpful.
The problem turned out to be the source I had chosen for the return line. We ran the return line directly back to the reservoir. (Fab’d a removable quick connect and cap for topping of the tank when needed out of black iron)
Note: we had tried this solution sometime earlier in all our previous attempts with no success, wrong PB source at that time maybe?
The port marked “N” on the casting of the loader valve (made by KYB for New Holland) was correct for the power beyond, a power beyond sleeve was not needed and the loader and the backhoe can be operated without disconnecting the backhoe.
Btw, these LS backhoes are sweet little units!
-Dez