Power Beyond - JD 790

jmerritt1 · Jan 24, 2017

Hello,

This is my first post, but I have reading posts from this site for quite some time. Its been very helpful.

I'm in need of a bit of advice. I have a JD 790 with a 70 FEL. I recently purchased a JD 7 backhoe to put on it. I purchased it knowing that I had to install the power beyond kit to my tractor. Its JD part number BM18005. Guess what....turns out that part is obsolete! I've searched everywhere for one and have had no luck. I have a search pending incase one pops up on Ebay, but I'm doubtful.

It doing some research, it appears like the kit was rather 'simple', so I am contemplating trying to build the kit myself. It looks like I need to tap into the supply side of the rockshaft and then plumb in a return to the rockshaft housing. I found a great post on anther site that seems like I could use stock hydraulic parts to build the supply and return lines.

My question(s) is relative to the connection to the rock shaft. The power beyond kit that JD used to offer hooked up to the rockshaft using a hollow screw and banjo connection on a hydraulic tube. It appears that I can get the hollow screw still (part M800853), but I need a banjo connection to a JIC that would fit the hollow screw. Does anybody know where I could get one? My plan was to connect to the rockshaft using the banjo to JIC, then use stock hydraulic hoses and fittings to create the power beyond lines. IS that a bad plan, or should it work? here is an image of the power beyond kit that I got from another post on this forum.

Appreciate any help that you can offer.

Thanks,
Jeff

beenthere · Jan 24, 2017

:welcome: to TBN

If you have not noticed, there are similar threads listed at the bottom of these posts.. looks like several address the same situation. Likely, as memory doesn't serve me exactly, there are discussions to do what you plan to do. But the bottom line, I believe that you can do it.. just know what to disconnect and plumb into .. as you are planning.

RobS · Jan 24, 2017

Welcome to TBN! I have the exact same setup with the Deere Power Beyond kit. If you need photos or measurements, let me know.

jmerritt1 · Jan 26, 2017

Bennthere,

thanks for the response. I did search the other posts and they have been most helpful. From those posts I think I fully understand how the power beyond kit works. At this point I'm just trying to come up with the best way to make the connection at the rockshaft. I just asked a question on the Hydraulics forum about using a Convert-A-Flare to transition from the existing metal hydraulic line to standard JIC fittings. this image shows my most current thought on how to make the connection. If I can do this, I could run standard hydraulic hoses to a rear set of quick connects. Of course I would have a connector hose to complete the loop when the backhoe was not in use.

jmerritt1 · Jan 26, 2017

RobS,

Thanks for the response.

I took off the cover over the SCV and rockshaft yesterday (see photo in post #4). Can you take a look at that photo and just confirm that my understanding is correct? From everything that I have seen and read, it looks like the power beyond kit just extends this hydraulic line to the back of the tractor, loops it, and sends it back to the rockshaft. If I'm understanding it correctly, I just need to extend this line (somehow) to a back set of quick connects, with a connection between the quick connects to be used when the backhoe is off.

Can you just check and make sure that those are the two ports that your power beyond uses? As I mentioned in pots 4 above, I'm thinking of using convert-a-flares and cut this hydraulic line so that I can extend it to the back. perhaps it just better to let a hydraulic shop braze on fittings instead of using a convert-a-flare. I've posted something on the hydraulic forum to see what experience other have had using convert-a-flare fittings.

again, I appreciate the help!

Jeff

kennyd · Jan 26, 2017

Jeff,
Those banjo fittings can be replace with ORB/SAE fittings, so you can connect directly to the tranny case with ORB->JIC adapters and not have to use any swagelocks.

RobS · Jan 27, 2017

jmerritt1 said:
RobS,

Thanks for the response.

I took off the cover over the SCV and rockshaft yesterday (see photo in post #4). Can you take a look at that photo and just confirm that my understanding is correct? From everything that I have seen and read, it looks like the power beyond kit just extends this hydraulic line to the back of the tractor, loops it, and sends it back to the rockshaft. If I'm understanding it correctly, I just need to extend this line (somehow) to a back set of quick connects, with a connection between the quick connects to be used when the backhoe is off.

Can you just check and make sure that those are the two ports that your power beyond uses? As I mentioned in pots 4 above, I'm thinking of using convert-a-flares and cut this hydraulic line so that I can extend it to the back. perhaps it just better to let a hydraulic shop braze on fittings instead of using a convert-a-flare. I've posted something on the hydraulic forum to see what experience other have had using convert-a-flare fittings.

again, I appreciate the help!

Jeff

Hey Jeff, sorry I didn't see this until now. I'll check tonight and let you know.

MacLawn · Jan 27, 2017

To kind of tag on to this thread about the 790, I looked at one yesterday, 500 hours with FEL, no backhoe. So, y'all saying here that installing a backhoe on the 790 is not easy, eh? If that's the case, I'll pass on this one, even though it's a great looking tractor with low hours. I need a backhoe.

pmsmechanic · Jan 27, 2017

kennyd said:
Jeff,
Those banjo fittings can be replace with ORB/SAE fittings, so you can connect directly to the tranny case with ORB->JIC adapters and not have to use any swagelocks.

I like this idea.

jmerritt1 · Jan 27, 2017

Kennyd,

thank you. that was what I was looking for. From another TBN post I know that the port is 3/4"-16, so that should be SAE 8. Now I can just get the correct ORB/SAE fitting and not have to reuse the banjo. again, thank you!

jmerritt1 · Jan 27, 2017

MacLawn,

It seems like it should be fairly easy to make the power beyond kit that JD no longer makes. Most of the trouble that I am having is my lack of experience with hydraulics (I have absolutely no experience with them). That said, I'm on the verge of a solution, so I will be sure to update this post once I have it figured out and working.

The 790 is a great little tractor. I've had good luck with it.

jmerritt1 · Jan 27, 2017

Thanks Rob.

beenthere · Jan 27, 2017

MacLawn said:
To kind of tag on to this thread about the 790, I looked at one yesterday, 500 hours with FEL, no backhoe. So, y'all saying here that installing a backhoe on the 790 is not easy, eh? If that's the case, I'll pass on this one, even though it's a great looking tractor with low hours. I need a backhoe.

I don't read into this that it is difficult.. just informative as to how to get the hyd. lines to where the backhoe connects. That looks pretty straight forward, as I see it shown.

RobS · Jan 27, 2017

MacLawn said:
To kind of tag on to this thread about the 790, I looked at one yesterday, 500 hours with FEL, no backhoe. So, y'all saying here that installing a backhoe on the 790 is not easy, eh? If that's the case, I'll pass on this one, even though it's a great looking tractor with low hours. I need a backhoe.

The initial setup, or prep, takes some time but if you have all of the correct brackets and such it's pretty easy. Once you have the tractor prepped, the install/remove is literally a minute or so. I got my hoe used and it was setup for a different tractor. I bought the install kit for the 790 and converted the hoe to fit. (they used the #7 backhoe on various different tractors).

RobS · Jan 27, 2017

Hi Jeff,

I got home and had a look at my tractor. UN-fortunately, I cannot see a thing with the cover in place under the seat (it's off in the photos you posted). Let me know how badly you need the info, it looks like I could pop that cover off pretty easily if you want.

I also found some extra parts that came with the PB kit but it's nothing you can't find locally.

And I have the parts catalogs for the 7 and 790. There is an exploded view of the PB kit but it's not very clear where each connection attaches. There are 3 solid lines shown but one must be for tractors without the DSCV control. Assuming you have the DSCV for your loader, it appears that both lines tie in there and not the rockshaft cover.

pmsmechanic · Jan 27, 2017

RobS said:
Hi Jeff,

I got home and had a look at my tractor. UN-fortunately, I cannot see a thing with the cover in place under the seat (it's off in the photos you posted). Let me know how badly you need the info, it looks like I could pop that cover off pretty easily if you want.

I also found some extra parts that came with the PB kit but it's nothing you can't find locally.

And I have the parts catalogs for the 7 and 790. There is an exploded view of the PB kit but it's not very clear where each connection attaches. There are 3 solid lines shown but one must be for tractors without the DSCV control. Assuming you have the DSCV for your loader, it appears that both lines tie in there and not the rockshaft cover.

Would the instructions for installing the PB kit be on John Deere's web site? Or if someone has one maybe they could scan it and post. John Deere usually has very comprehensive instructions with their kits.

beenthere · Jan 28, 2017

I looked at my service tech manual that covers the 790 and found these two pages that may help.. (seems a bit brief to me).

pmsmechanic · Jan 29, 2017

beenthere said:
I looked at my service tech manual that covers the 790 and found these two pages that may help.. (seems a bit brief to me).

This will definitely help the op but what I was thinking about is the installation instructions that come with the kit. They are usually very detailed.

I went to here John Deere - Parts Catalog and found the part number for the 790 PB kit which is part number BM18005. I googled "john deere bm18005 installation instructions" and came up with nothing for that kit. What I did come up with is this: http://www.greenpartstore.com/assets/images/instructions/2012/lvb25220_installation_instructions.pdf. These are factory instructions for PB kit LVB25220.

These instructions are obviously for the wrong kit but I wanted to show what was available from John Deere. Anybody who can read can follow them. So....If someone saved their instructions and could post them that would be great.

Another route to go would be to go to the service manager at you local dealer and ask if they would print off the instructions for you. I'm sure they would have a copy in their computer somewhere. If you run really stuck I can ask my service manager buddy if he would give me a copy. Just pm me or leave a note on the forum.

jd110 · Jan 29, 2017

I have a pdf of the instructions but the file is too large to attach here. It is approx. 18MB. I can send it by email if you send me your email address.

jmerritt1 · Jan 30, 2017

jd110 said:
I have a pdf of the instructions but the file is too large to attach here. It is approx. 18MB. I can send it by email if you send me your email address.

Just sent you my e-mail address in a private message. appreciate the help!