Hydraulics, Redux...

StoneyFF · Apr 6, 2004

Hey, guys...

Did some more investigating and I think I'm beginning to understand more about the Hydraulics on my TC35D.

To refresh everyone's memory, I have a grapple on the bucket that uses the first rear remote to move it... or would if the hose hadn't sprung a leak and been removed so I can get them replaced... and on that note, is $135 for two 20' hoses reasonable?... Back to the original issue <grin>...

Anyway, when the backhoe is hooked up, it uses one of the lines that normally goes to the rear remotes... meaning that the rear remotes (and the grapple) aren't functional when the backhoe is on. Well, I just took the PHD off (after digging some holes and finding a lot of rocks... in some cases so many that I'm going to have to use the backhoe!)... took the PHD off and put the back hoe back on... by myself, I might add <proud smile>... Well, as I hooked things back up, I realized that the first hose (the shorter one) hooks up to what I think is the 'power beyond' hose coming off of the three rear remotes. If that is, indeed, the 'power beyond' then the other hose would be the return, right? Cause the other one is the one that I have to disconnect from the remotes in order to plug in the other (longer) back hoe hose... So, if it's the return, shouldn't I be able to Y the two returns together back to the sump instead of having to disconnect one to connect the other?

OK, so what am I missing, cause if it was this simple, wouldn't the dealer have installed it right in the first place?

Stoney
{I'm gonna get this right if it kills me... um... let me rephrase... <grin>}

JerryG · Apr 6, 2004

Stoney,
I think that a schematic of the hydraulic circuit with and w/o the backhoe would benefit you quite a bit.

 Hello Guys, does anyone have one for a NH?

MadReferee · Apr 6, 2004

Depending on the hose (diameter, # of wires) figure 30 to 50 cents per inch ($3.60 - $6.00 per foot) plus end fittings. You are looking at 40 ft of hose so figure $144 - $240.

It looks like $135 is well within the ballpark.

PineRidge · Apr 6, 2004

Jerry and Stoney I was lucky enough to locate the assembly instructions that came with my backhoe. The longest line from the backhoe actually connects to the power beyond port. The shorter line is the return line back to the tractor. The loop itself should have nothing to do with the rear remotes since the return is tapped into the end plate on the end of the remote bank itself.

Normally there is a flexible hydraulic hose coming from the joystick FEL control with a female quick connect fitting on the end that terminates at the control valve (port 7). To make the backhoe connection this hose is disconnected from the control valve and connected to the longest hose on the Backhoe. This is actually the power beyond port connection. All connections must be made with the tractor engine OFF NOT RUNNING. The shortest hose from the backhoe is attached to the port in the end of the remote end plate. Am I confusing you now???

The above procedure renders the HPL inoperative while you are using the backhoe. Otherwise if the 3-point hitch were to operate while the backhoe was in place very bad things might indeed happen.

WARNING: I was told that starting the tractor without either the HPL or the Backhoe connected would flat out destroy the Hydraulic pump. One or the other must be connected before you start the engine.

My final thought is this, can the grapple and the backhoe be T'd together? I don't really know the answer to that question. I personally don't know why they can't but I would ask someone with a bit more knowledge on the hydraulic system than myself. You just want to be darn sure that the HPL can't operate when the backhoe is in place.

MadReferee · Apr 6, 2004

Do the rear remotes work when the backhoe is connected? I'll bet they don't since you have broken the high pressure connection to them and the 3pt when the backhoe is connected to the loader's power beyond hose.

The setup in the diagram makes the backhoe the last valve in the circuit since it only has a high pressure inlet and a return to tank outlet. Now if the backhoe had a power beyond outlet, it would connect to where the loader hose connected to the manifold, thus continuing the circuit to the remotes and the 3pt. Dangerous, yes, but it looks to be the only way to make the remotes work with the backhoe (based on the diagram).

MikePA · Apr 6, 2004

<grin>... = /forums/images/graemlins/grin.gif
 <proud smile>... /forums/images/graemlins/cool.gif

PineRidge · Apr 6, 2004

Do the rear remotes work when the backhoe is connected? I'll bet they don't since you have broken the high pressure connection to them and the 3pt when the backhoe is connected to the loader's power beyond hose.

The setup in the diagram makes the backhoe the last valve in the circuit since it only has a high pressure inlet and a return to tank outlet. Now if the backhoe had a power beyond outlet, it would connect to where the loader hose connected to the manifold, thus continuing the circuit to the remotes and the 3pt. Dangerous, yes, but it looks to be the only way to make the remotes work with the backhoe (based on the diagram).


Mad I truthfully can't answer that question. I just installed my rear remotes about a week ago, and my rear top & tilt cylinders are on their way from CCI. Maybe someone else might have the answer to that question. I do remember that techinNY told me that the return connection at the rear remotes was a return point only for the backhoe circuit and not subject to high pressure but I can't verify that one way or another.

MadReferee · Apr 6, 2004

I do remember that techinNY told me that the return connection at the rear remotes was a return point only for the backhoe circuit and not subject to high pressure but I can't verify that one way or another. 

That further comfirms what I thought, the backhoe is the last valve in the circuit and the remotes and the 3pt are not connected when the backhoe is.

jinman · Apr 6, 2004

Stoney, considering the headaches you are having with the remote valves, I think I'd run the FEL bucket curl through a solenoid actuated dual diverter valve and put a button on the side of my FEL joystick that when depressed would actuate the grapple. Then you would control the grapple with a left-right movement of the joystick. After gripping the material, you'd release the button and go back to normal FEL operation. Considering the hassle your rear remotes are going to give you with the backhoe installed, I think using the diverted FEL circuit would be a superior setup. Does this sound possible?