Backhoe Hydraulics for Backhoe

[jgbanshee]

For my next question. The loader valve has 1" OD steel tubing for the IN and the OUT then it has 1/2" steel tubing with hose to all the cylinders.

Can I run 3/4" from the OUT on the loader valve to the divider valve to the backhoe and back to the reservoir?

 

[MadReferee]

Yes, although you will have some restriction, probably on the order of going fron 3/8" hose to 1/4" hose which is very common on CUTs. I wouldn't worry about the work ports. Most work port hoses are smaller than the main hoses anyway. My dozer has 1.25" steel for the main circuit and 1/2" hoses for all the work ports.

 

[montejw]

Can I run 3/4" from the OUT on the loader valve to the divider valve to the backhoe and back to the reservoir?

??????

Are you doing this?

Pump >> Loader valve in >> Loader valve out >> Divider valve >> Backhoe >> Tank?

I think you want to do this:

Pump >> Divider (diverter?) >> Loader valve in OR Backhoe in

Monte

 

[jgbanshee]

I want to do this to keep the original 26 GPM flow to the loader then divide the flow to the backhoe to compensate for the smaller 14 GPM valves in the backhoe.

Pump >> Loader valve in >> Loader valve out >> Divider valve >> Backhoe >> Tank

 

[montejw]

I want to do this to keep the original 26 GPM flow to the loader then divide the flow to the backhoe to compensate for the smaller 14 GPM valves in the backhoe.

Pump >> Loader valve in >> Loader valve out >> Divider valve >> Backhoe >> Tank

So you'll use one of these and go:

pump >> loader in >> loader out >> divider >> backhoe (priority) AND tank

Surplus Center Item Detail

I hadn't seen those before. Seems like it should work, as long as the divider valve doesn't let the pressure go to the tank port when you load up the backhoe circuit.

Monte

 

[jgbanshee]

When will I use steel fittings that are JIC and when will I use the NPT. The divider valve specs says NPT.

 

[MadReferee]

Doesn't realler matter. Use whatever is convenient. Most tractors have a combination of both.

 

[jgbanshee]

I called Surplus Center today and talked with a tech person. I explained the system that I am proposing (Pump>>Loader Valve>>Divider Valve>>Backhoe Valve>>Reservoir) and the person told me that I will be risking cracking the outlet side of the loader valve or having the loader cylinders working without anyone touching it. He said that there will be a pressure on that side of the loader valve now because of the backhoe valve upstream unlike now with it being a return line.

What do you all think?

 

[jgbanshee]

I cannot find anyone who makes a 2 spool valve with Power Beyond to replace mine and also fit into the space provided on the loader. Plus the ones that I think there is a possiblity to custom fit them, they are only 25 GPM not 26 GPM.

 

[montejw]

I cannot find anyone who makes a 2 spool valve with Power Beyond to replace mine and also fit into the space provided on the loader. Plus the ones that I think there is a possiblity to custom fit them, they are only 25 GPM not 26 GPM.

Do you think you'd notice 1 gpm?

Monte

 

[montejw]

I cannot find anyone who makes a 2 spool valve with Power Beyond to replace mine and also fit into the space provided on the loader. Plus the ones that I think there is a possiblity to custom fit them, they are only 25 GPM not 26 GPM.

How about a picture of the loader control valve showing the mounting/space?

Monte

 

[jgbanshee]

The first post, picture 3 shows the loader valve with no other room around it.

 

[montejw]

The first post, picture 3 shows the loader valve with no other room around it.

I saw that. The picture is too close to the valve to see anything. For me anyway.

Monte

 

[jgbanshee]

Here are some more photos of the loader valve and plumbing. You can see the 1" OD input and output lines on the bottom of the valve along with the two working lines for the loader lift cylinders. On the top there are two working lines for the bucket cylinders. No room for me to buy another valve with power beyond unless the port was vertical.

 

[john_bud]

I cannot find anyone who makes a 2 spool valve with Power Beyond to replace mine and also fit into the space provided on the loader. Plus the ones that I think there is a possiblity to custom fit them, they are only 25 GPM not 26 GPM.

Remember that the 26 GPM spec is for a NEW pump at full RPM. I don't think you will be red lining the engine while running and the pump is no longer new. It's probably closer to 22-23 GPM just from age and use increasing the clearances.

Also the flow spec are flow with a certain pressure loss. They will flow more than the spec, but will have more of a pressure loss.

jb

 

[montejw]

Here are some more photos of the loader valve and plumbing. You can see the 1" OD input and output lines on the bottom of the valve along with the two working lines for the loader lift cylinders. On the top there are two working lines for the bucket cylinders. No room for me to buy another valve with power beyond unless the port was vertical.

Move the valve. Fab a new mount above the engine cowling, put any valve you want up there, lots of room.

Monte

 

[jgbanshee]

Who makes a 2 spool valve that has the inlet and oulet on the bottom side of the valve? I can only find side and top inlets/outlets.

 

[montejw]

Who makes a 2 spool valve that has the inlet and oulet on the bottom side of the valve? I can only find side and top inlets/outlets.

I don't know.

But even if all the ports are on the sides or top, you'd only need some hoses made up to route from the new valve to the existing hard lines, along with the proper adapters.

I'm sort of going through the same process myself. I've got a valve I want to replace, it lays flat with the work ports on top and the inlet and outlet are on the front edge. The valve I bought will mount (for now) on edge with the work ports coming out the side. It will look ugh buttly, but for now that's the way it's got to be. It'll mount flat when I fab up a new fixed point pivot mount for the joystick.

Monte

 

[jgbanshee]

Have any photos?

 

[montejw]

Have any photos?

Nothing to see yet, still buying fittings and hoses. I'll have some.

Monte