758C Hydraulic Hookup Question

[SevernDH]

OK, so it has been a while since I posted about buying a used 758C and the boneheaded mistake I made not realizing it didn't come with all the brackets to mount it. I did get all the necessary parts from Partspring, and they were very helpful after I got over the sticker shock (NH's fault more than theirs). I did have an issue with how badly chipped the parts were upon arrival, but Partspring sent me a can of primer and a can of paint, so it was relatively easy to make them passable (they offered to replace the parts, but since it involved another couple trips in the back of a freight truck, I opted for paint).

On to my question: I have made the hydraulic connection at the rear of the tractor easily enough, but am trying to find a better solution for the connection to the block manifold up by the loader.

From parts diagrams and from this thread: http://www.tractorbynet.com/forums/1122312-post5.html ... it looks like all recommendations are to have either the FEL or the BH connected, but never both at once.

I would prefer a solution where I can have both available so the FEL can be used to stabilize when the tractor is moved without swapping hoses every time. I don't expect to use both at the same time, just want to use both without hose juggling.

Any suggestions? Or is there a reason I am missing as to why this is just not possible?

 

[SevernDH]

Oh, and thanks again to Hematite for sending pictures of his setup. It took a lot of the guesswork out of the installation

 

[billfires]

I have a 758C on a NH1920 and can assure you that you can operate the loader and the BH together. You will lose the 3ph hydraulics when you connect the BH hoses. Bill C

 

[dave1949]

There should be a long, flexible hyd. hose with a female QD that runs forward from your hoe along the subframe. Mine is on the right side of the frame. There is also a flex. hyd hose with a male QD droping down out of the plastic cover around your FEL joystick. It actually goes to the 3pth lever control valve.

You remove that line from the main hyd. distribution block below the right floorboard and connect it to the long line coming from your hoe. Position your 3pth arms where you want them height-wise, because they will only go down once you remove that short hose.

You will probably need to bungee up those connected lines so brush can't rip them off as there will be slack and they will droop down.

Hope this is helpful. Your FEL operation is not affected in any way.
Dave.

 

[SevernDH]

Maybe I am still missing something, but I am still thinking I will lose FEL function. Maybe it would help if I wasn't a rookie with hydraulics.

Making the connection to the hydraulic manifold requires disconnecting a line from the FEL control valve, which I am assuming needs to be connected for proper function.

While I can't find exact instructions for installing a 758C to a TC40DA, the thread I referenced earlier for installing a Woods BH and the parts diagrams I have found on Messick's and Partspring both suggest this is the way to do it.

I guess I need to try it and see if things work, rather than making assumptions and trying to solve a problem that I may not have

Should have enough time to hook it up tomorrow afternoon, but may be Saturday afternoon before I can get out to buy some more oil to flush the BH and try it all out. Hopefully, I am not just wasting your time to read this

 

[dave1949]

Maybe I am still missing something, but I am still thinking I will lose FEL function. Maybe it would help if I wasn't a rookie with hydraulics.

Making the connection to the hydraulic manifold requires disconnecting a line from the FEL control valve, which I am assuming needs to be connected for proper function.

While I can't find exact instructions for installing a 758C to a TC40DA, the thread I referenced earlier for installing a Woods BH and the parts diagrams I have found on Messick's and Partspring both suggest this is the way to do it.

I guess I need to try it and see if things work, rather than making assumptions and trying to solve a problem that I may not have

Should have enough time to hook it up tomorrow afternoon, but may be Saturday afternoon before I can get out to buy some more oil to flush the BH and try it all out. Hopefully, I am not just wasting your time to read this

Could be some difference between our TC40's backhoe plumbing, mine is not a DA. If they are the same - you are not disconnecting a line from the FEL control valve. You disconnect it at the hydraulic distribution block/manifold end. On my tractor, that hose drops down out of the plastic shield around the FEL control valve and attaches to the distribution box. It is the only flex line on the distribution box. Unplug it from the distribution box and connect to the long hose coming from your backhoe.

That should do it if our tractors are plumbed the same for using a backhoe.

If none of that makes sense when you look at it tomorrow, then maybe a DA model owner can help you better.
Good luck.
Dave.

PS - You will likely need to use the stabilizer pads and hoe arm/bucket to do the mounting on the tractor. You need to lift the hoe up enough to back into it and engage the carrier beneath the PTO shaft area. Be careful with this step, wild backhoe arm swings can damage the underbelly area of your tractor. Use a dead low idle speed.

I start with the subframe flat on the ground. I back over that and get close enough to connect the hydraulic lines. Then I start getting the subframe aligned and at the correct height using the hoe, pads, and bucket to twitch things. When I have the height and alignment, I use the hoe arm to lower the front end of the subframe such that it will not be hit by the ears that drop down where the subframe is pinned on each side. Then I back up some more and get the backhoe crossbar into the carrier beneath the tractor. When that is done, I use the hoe arm/bucket/pads to raise the front end of the subframe up between the pinning brackets. You may need to twitch here and there, up, down, left right to get the pins in. Tapping with a hammer is okay too. It's easier to do than to describe

 

[SevernDH]

Dave, I think I follow you on how to hook things up, and I appreciate your help with that. Looks like it will take me a little longer than I thought, since I now have to order a hose and another quick connect coupler. The connection from the FEL control housing to the manifold is a rigid tube in my case, so I need the hose and additional coupler to make it all work.

Thanks to everyone who has helped, I would be completely lost without the help of others' experience on this one. Will post progress and further questions as I get further into the process.

 

[dave1949]

Dave, I think I follow you on how to hook things up, and I appreciate your help with that. Looks like it will take me a little longer than I thought, since I now have to order a hose and another quick connect coupler. The connection from the FEL control housing to the manifold is a rigid tube in my case, so I need the hose and additional coupler to make it all work.

Thanks to everyone who has helped, I would be completely lost without the help of others' experience on this one. Will post progress and further questions as I get further into the process.

You are welcome to any help I can give you. I am worried that your DA and my S may not be plumbed the same. I have 3 or 4 rigid tubes that go into the FEL joystick area. Before you spend money on hoses and couplers, try to get some help on here from someone who has a DA model with a hoe maybe.

Dave.

 

[Raspy]

I have a TC 29DA with a 758 backhoe and the front end loader. They both work at the same time just fine. Sorry, but the tractor is a couple hundred miles from here and I can't be specific with the hose routing. Dave 1949 has his the way mine is. I just use a quick disconnect to remove one and plug in the other, up in the front near the right floorboard but actually attached to the frame.

 

[dave1949]

I have a TC 29DA with a 758 backhoe and the front end loader. They both work at the same time just fine. Sorry, but the tractor is a couple hundred miles from here and I can't be specific with the hose routing. Dave 1949 has his the way mine is. I just use a quick disconnect to remove one and plug in the other, up in the front near the right floorboard but actually attached to the frame.

I wonder if the flex. hyd. hose that seems to be missing is part of the backhoe kit? Mine came with the hoe already installed by the dealer, so I'm never sure what a TC looks like without one.
Dave.