Backhoe Hydraulics for Backhoe

[jgbanshee]

I am trying to figure out how to route hydraulics for a backhoe attachment for my Ford 345C tractor. I attached some photos of the loader valve, which I would like to run some sort of 'Power Beyond' setup cause the pump is pumping 26gpm and the remote cover that is on the top cover of the tranny. There is also a photo of a flow control valve that I am not sure exactly what it does.

 

[jgbanshee]

My question is: How can I go about getting hydraulics back to a backhoe without the use of a PTO pump? My first choice would be a Power Beyond setup. My second would be adding rear remotes from the tractor's internal hydraulics by means of the under the seat block off plate on the top cover.

 

[FULLPULL]

It depend's on the backhoe .We have a 730 loader on an old ford the backhoe does tie into the loader valve. I would look up a part's diagram on newholland's web site go to part's and there should be a diagram of your loader.

 

[MadReferee]

That valve doesn't look like it's configured for power beyond. But don't despair, all you have to figure out is which line is the valve inlet and which is the outlet. Since you won't be using the loader and backhoe simultaneously it doesn't matter.

Just put your backhoe valve in series with the loader valve, either before the loader valve (not recommended) or after the loader valve (recommended). You will have to determine the best way to plumb the connections since I don't guess you want the backhoe on there permanently. A couple of QD's and a loop hose will suffice for when the backhoe is off.

 

[jgbanshee]

MadReferee, are you saying that if I were to put the backhoe valve in series with the loader valve I would not be able to use both attachments simultaneously? Is this because of a reduction in flow?

 

[MadReferee]

Why would you even want to use both simultaneously, meaning activating a spool on each valve together?

A reduction in flow is not quite the right term but without being configured for power beyond, the first valve dumps its neutral pressure exhaust fluid back into the main circuit. Not good if you want to power another valve further on in the circuit.

 

[FULLPULL]

I found the tractor part's breakdown of your tractor including the loader and hydraulic breakdown on the nh website .Look under part's then lookup 345c.Our tractor is older a 1968.Your tractor is 1988 and newer as to the site .If you call the right nh dealer to work on ford/nh construction equipment i almost bet there is a control valve under the loader to add your backhoe to.This is just my opinion.I think you can make a loop from the presure side back to the return like madref said.That's the way our's is set up off of the loader valve. You cant take our backhoe line's loose and plug them when removing the backhoe as i was told it would break something from a old mechanic .You have to couple them back together to make a loop from the presue side back to the return if you run the tractor without the backhoe.All of this work's on our setup .We only use the backhoe or the loader only one implement at a time and where not starved for fluid or presure . I would ask someone at NH if it work's for your's or get a service manual.

 

[jgbanshee]

Do I just splice into the system with Tee fittings or is there something else that I must do?

 

[MadReferee]

Do I just splice into the system with Tee fittings or is there something else that I must do?

You cannot tee into a pressure circuit. You backhoe valve MUST be in series with the loader valve. You have to break the line and insert your backhoe in series. When the backhoe is not in the circuit, the circuit must remain complete using a jumper hose. Failure to do so will dead head the pump and your wallet will be short a significant amount of money.

 

[herringchoker]

I owned and operated a Ford 4500 with FEL and 755 backhoe for 17 years. I just looked up the hydraulic circuit diagram in the Service Manual. It shows pump output going to the inlet of the backhoe valve, then from the outlet of that valve to the inlet of the loader valve, and then from that valve's outlet to the tank. There was no power beyond function back then (1967). Like MadRef and FullPull say, hook them up in series. You won't be able to operate the hoe and loader at the same time (if you can even reach both sets of levers at the same time ), but that was never a problem with me.