Backhoe how many hydraulic lines needed to run a backhoe?

[adlertom]

Hello,

I'm new to tractors, and have a hydraulics question:

I'm buying a New Holland NH TC33DA with a FEL. I'm not purchasing anything right away that requires rear hydraulics, but I want to be ready for the future.

If I ever buy/rent a backhoe in the future, how many hydraulic lines are needed to run it? I can add two sets of rear lines as dealer installed options. Do I need both sets or is one set adequate? Is anything else necessary?

Thanks,

Tom

 

[Cliff_Johns]

Back hoe will need one line going out and one return, no SCV -- sometimes called power beyond. The Back hoe has it's own controls.

You would want a set with an SCV if you want to control hydraulics from the seat like you would with a hydraulic top link or something like that.

Cliff

 

[jinman]

I think Cliff is right about a backhoe only needing a single supply and a single return. I also think those are not connected using the standard remote valve. The standard remote valve has to be controlled by a lever at the normal tractor operator's station. That's not what you want for a backhoe.

Adlertom, why don't you post this question down in the New Holland Owning/Operating forum. You'll be more likely to find help there from folks who are experts. I'd answer your question, but I don't have a backhoe, so I can't give you all the specific details you need. I just know general info. /forums/images/graemlins/smirk.gif

 

[Gary_in_Indiana]

I have a Deere 4200 with their model 47 backhoe and there are only two hydraulic lines to connect/disconnect when attaching/removing the backhoe from the tractor. I would assume that would be it for a New Holland as well.

 

[PineRidge]

You have been given good advice so far. I have a TC-40D equipped with a BH and it attachés by means of the power beyond. Actually there are two hydraulic lines as Cliff stated one supply & one return. Once The BH has been connected to the power beyond it disables the 3-point lift as well as any rear remote function while you are using the BH.

 

[adlertom]

</font><font color="blue" class="small">( Adlertom, why don't you post this question down in the New Holland Owning/Operating forum. You'll be more likely to find help there from folks who are experts.
)</font>

I guess I considered this more of a general question about backhoe hydraulics. Is this type of thing pretty standard or do different manufacturers configure their backhoes differently?

The dealer installed optional remote valve is a self centering valve controlled from the operators position (lever installed in the right fender). So, it sounds like this isn't what I would want to use for a backhoe, woodsplitter, or other such rear mounted attachment.

Am I correct in assuming that the self centering valve would be more appropriate for rear mounted PTO attachments that had some sort of hydraulic control component, like the chute direction on a snowblower, or the height of a rotary cutter?

Would I just need a supply and return hydraulic line with connections convienent to the rear of the tractor?
Tom

 

[adlertom]

Mike,

Thanks for the info.

I don't completely understand "power beyond", but does this mean you have a pair of quick disconnects somewhere near the rear of your tractor for the backhoe attachment?

Could this also be used for some other attachment that did not require control from the operator position, such as my woodsplitter example?

 

[Cliff_Johns]

</font><font color="blue" class="small">( I don't completely understand "power beyond", but does this mean you have a pair of quick disconnects somewhere near the rear of your tractor for the backhoe attachment?

Could this also be used for some other attachment that did not require control from the operator position, such as my woodsplitter example? )</font>

Yes, and yes.

Cliff

 

[PineRidge]

One of your attachment points is in the middle of the tractor near the manifold block/diverter block and the second connection is on the end plate of one of your rear remotes. If your tractor has no rear remotes then there will be a blank off plate in that location and the plate should be tapped for the BH connection.

 

[Henro]

Here is my take on it...disregard if it seems to be nonsense... /forums/images/graemlins/crazy.gif

My understanding is the most subcuts use an open center hydraulic system, which has all the components (loader, 3PH, and do on) hooked up in series. Each contol valve is set up so that when the handles are centered, the hydraulic flow just passes right through that particular control valve and down stream to whatever may happen to be there.

Now, if rear remotes are installed, it is my understanding that they generally involve installation of additional control valves, that control the flow of the hydraulic fluid to their outlet points.

Generally, one would hook a cylinder to the provided outlet points and use the handle of the control valve that was connected to those outlet points to control that cylinder.

Some tractors have a point where additional hydraulics can be hooked to. It is simply a point at which the series loop can be connected into. In this case, the flow is diverted from the series loop to the new control valve, and then back to into the series loop. So that all the original equipment on the trackor, like the loader and 3PH will still be able to function.

Often if a control valve is inserted, it needs three hoses that are related to the tractor. These are the inlet, the return to tank, and the power beyond, which simply is returns the hydraulic fluid to the original series loop, where it can provide pressure to do work somewhere down stream.

Now if you had a backhoe, it would seem to me it would be no different than having a log splitter or anything else. Seems to me the control valve would have three hoses associated with it, if indeed it was an open center type setup that is common on CUTs. You would have an input point, where the hydraulic fluid would come in. You would have a power beyond output point, that would send the hydraulic fluid on to watever was down stream when the backhoe was not in use, and you would have a return to tank, that would send the fluid from the backhoe back to the tank when the back hoe was in use.

The point I am trying to make is there is a difference between rear remotes that are added to a tractor for use by things such as top and tilt, and what you might need for use with a backhoe.

The backhoe would likely have its own control valves and would not need the control valve that are normally associated with rear remotes that might be an option from the tractor manufacturer...

Hope this makes some sense... /forums/images/graemlins/smile.gif /forums/images/graemlins/blush.gif