IH 684 add hydraulic rear remotes

I want to add rear hydraulic hookups on my IH 684 tractor. Right now it has no hydraulic function outside the transmission and power steering. I see a plug on the side of the hydraulic pump assembly that I assume will be a pressure point where I can connect my hoses to. What I don"t know is where to connect the return. Does anyone have a service manual that can look this up and maybe email me the diagrams? If not, do you know if this will work and can you give me some tips? Thanks!

(quoted from post at 22:54:23 06/04/12) I want to add rear hydraulic hookups on my IH 684 tractor. Right now it has no hydraulic function outside the transmission and power steering. I see a plug on the side of the hydraulic pump assembly that I assume will be a pressure point where I can connect my hoses to. What I don"t know is where to connect the return. Does anyone have a service manual that can look this up and maybe email me the diagrams? If not, do you know if this will work and can you give me some tips? Thanks!

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Hi Jason, I would look for a 74 or 84 series tractor in a scrap yard and buy the rear remote assembly.

If you are just hooking in up to a log splitter with its own hydraulic controls, look at attached diagram.

JimB

Thank you Jim. Very helpful. Do you know if I am correct to assume I can get pressure from the plug on the pump assembly? There is a hose connect directly beside it that looks to have the same size fitting as what would replace the plug?

In the diagram it says to connect to the elbow on #38. Can you tell me what #38 is? It doesn't look like the pump assembly I'm seeing. Thanks again!

Hi Jason, are you saying your 684 does not even have a 3pt and draft control? I assume what you are calling the hydraulic pump is the MCV (Multi Control Valve) that the filter is attached to? The pump is actually behind the MCV. The MCV's function is to split up the 12 GPM hydraulic flow from the pump into 3 GPM@1500 PSI for PS and PB, 9 GPM@2500 PSI for 3pt and remotes, and 160 PSI for PTO. Looking at filter on MCV the left side is for PS and PB, top right is for PTO and right is for 3pt and remotes. All the other plugs are for relief valves, splitter and test ports. Hydraulic housing is the large casting that is mounted on top of differential housing, has the 3pt rock shafts and the hydraulic filler plug and a good portion is under the deck plate under the seat. To access Tube #39 you have to lift the seat and the deck plate, elbow #38 is located under the deck plate at the right front corner of the seat at the right front corner of hydraulic housing.

The hydraulic system on 684 is open center meaning that hydraulic flow has to continuous high pressure to return. If you are planning on connecting the high pressure side to a remote on a log splitter and return to drain plug under axle that will work but if you remove the log splitter control valve out of the circuit then you will have to connect pressure line to return line.

Hope this helps
JimB

Yes very helpful Jim. You were correct I was calling the MCV the hydraulic pump. Now I have a clearer picture. I need to remove the seat and will gain access to the hoses where I need to connect. My next question was going to be about the valves but you already answered it. I need to get open center valves so the flow is continuous. Also, do you know why I have to remove hose #39?

Hi Jason, pipe #39 is the high pressure retun from end plate where remote valve normally is to the draft control return. By removing pipe #39 and diverting flow to new hydraulic valves, high pressure flow is now going to new valves. You could plumb return line into draft control return instead of drain plug under the axle but all the loader installations that I have seen follows the left hand side of the diagram that I posted.
I hope your 684 has pipe #39 and draft control under the seat because about a year ago someone posted on here about a 674 that he had bought from the state and it had no remotes and no draft control and no pipe #39.

JimB2

I know it has a draft control handle but I haven't removed the seat or anything to look for pipe #39. Thanks again for all your help Jim.