JD 790 w/woods BH75 Pto and subframe

[dp93]

Hi, tried a couple searches and didn’t have luck. So if this info is already available elsewhere I could use a hint.
I have an old 790 compact w/o rear hydraulic.
I’m needing a backhoe on it.
I found a Woods BH75 with a subframe off another 790 w/ Pto pump.
I haven’t viewed the hoe in person but it looks like it doesn’t quick attach or detach. Is this correct? Just trying to figure out what I’m signing up for.
Thanks for your time and assistance
dp

 

[TractorTech]

Welcome to TBN!

It is not quick attach, but it will detach. It could have a 3pt attachment, which will detach from the 3 point.
OR
It could be a later 4 point attach which is detachable as well. Go to:

3 Point

Woods BH75 Backhoe Parts Diagrams

Woods Parts Catalog Lookup. Buy Woods Parts Online & Save!

www.messicks.com

4 Point

Woods BH75 Backhoe Parts Diagrams

Woods Parts Catalog Lookup. Buy Woods Parts Online & Save!

www.messicks.com

 

[rScotty]

You don't have much choice since you want a subframe and the PTO pump style.
That's not all bad since both are big advantages.

The PTO pump is quick to connect, it just slides on and off the PTO shaft.

The Woods is a better type of subframe. It has some cross member parts that are permanently bolted to the bottom of the 790 - be sure the one you get as used comes with those!
Once those permanent parts are mounted, the backhoe just slips into those mounts and is fixed with some pins and hooks.
Here's a similar hook up in an online manual.

 

[dp93]

Thanks y’all.
rScotty that’s the info. I was looking for. The subframe and hoe stay together and connect/disconect to the tractor via cross beam connection points that are added to the tractor. Right?
Thanks again.

 

[rScotty]

Thanks y’all.
rScotty that’s the info. I was looking for. The subframe and hoe stay together and connect/disconect to the tractor via cross beam connection points that are added to the tractor. Right?
Thanks again.

That is exactly ow it works. You will eventually want to make up a simple stand to park the BH on, and then It is no more work than hooking up any other implement.

You are going to love the BH, but they do throw a small tractor around pretty easily. You'll appreciate the strength and rigidity of the subframe.

That PTO-powered BH was quite a bit more expensive originally than the same hoe that used tractor hydraulics. I think you'll like it. The PTO has enough more flow to make small bucket movements smoothly.

Woods is good equipment; and they used to have an inexpensive thumb for that hoe.
For an old guy - like me - who likes to build dry stone walls, nothing beats a little hoe with a thumb for picking, placing, and general craning. Of course all BHs can dig, but it's the other things they do that make them so handy.
Hope you get it,
rScotty

 

[lostcause]

i had a JD770 & Woods BH7500 bought new in 1996 - both of the predecessors of what you have. I opted for 3PH mounting and went with the PTO pump both due to dealer recommendation and not really knowing a lot about it back then. Knowing what I know now and having it for around 25 years, i probably would have gone the opposite way on both counts...

I never had any strength issues with the 3ph mount - many people swear you'll break them in half without a subframe. I can say that combination of tractor & backhoe probably not. i thrashed and pounded on a lot of large stumps and rocks over the years and did not break anything other than a few hydraulic hoses. I found the 3ph awkward to get aligned and hooked up. I stored outdoors so there was a lot of side to side alignment adjusting to try to get all the pins where I needed them. Also, the stock 3PH mount is a semi-universal design with an adjustable top link and there was no ideal adjustment - it either left the hoe angled slightly up or slightly down with respect to the ground. I think the subframe mount would have been easier to mount. my primary decision was that the tractor did not have a lot of ground clearance, and I feared I would be dragging the subframe a lot.

as far as the PTO pump, it was perfectly fine. at some point in the late 90's / early 2000's when i had started to learn more about tractors, i found that the PTO pump was 6GPM. That tractor had a 5.6GPM internal pump for the hydraulic system, excluding power steering. A few years after I added power beyond to run the hydraulic feed on a chipper, and eventually, around 2021 the PTO pump shaft broke. the pump and tank were then removed from the tractor and it was plumbed to the tractor power beyond when needed. There seemed to be no noticeable difference in hydraulic power with the backhoe.

 

[rScotty]

i had a JD770 & Woods BH7500 bought new in 1996 - both of the predecessors of what you have. I opted for 3PH mounting and went with the PTO pump both due to dealer recommendation and not really knowing a lot about it back then. Knowing what I know now and having it for around 25 years, i probably would have gone the opposite way on both counts...

I never had any strength issues with the 3ph mount - many people swear you'll break them in half without a subframe. I can say that combination of tractor & backhoe probably not. i thrashed and pounded on a lot of large stumps and rocks over the years and did not break anything other than a few hydraulic hoses. I found the 3ph awkward to get aligned and hooked up. I stored outdoors so there was a lot of side to side alignment adjusting to try to get all the pins where I needed them. Also, the stock 3PH mount is a semi-universal design with an adjustable top link and there was no ideal adjustment - it either left the hoe angled slightly up or slightly down with respect to the ground. I think the subframe mount would have been easier to mount. my primary decision was that the tractor did not have a lot of ground clearance, and I feared I would be dragging the subframe a lot.

as far as the PTO pump, it was perfectly fine. at some point in the late 90's / early 2000's when i had started to learn more about tractors, i found that the PTO pump was 6GPM. That tractor had a 5.6GPM internal pump for the hydraulic system, excluding power steering. A few years after I added power beyond to run the hydraulic feed on a chipper, and eventually, around 2021 the PTO pump shaft broke. the pump and tank were then removed from the tractor and it was plumbed to the tractor power beyond when needed. There seemed to be no noticeable difference in hydraulic power with the backhoe.

That is exactly ow it works. You will eventually want to make up a simple stand to park the BH on, and then It is no more work than hooking up any other implement.

You are going to love the BH, but they do throw a small tractor around pretty easily. You'll appreciate the strength and rigidity of the subframe.

That PTO-powered BH was quite a bit more expensive originally than the same hoe that used tractor hydraulics. I think you'll like it. The PTO has enough more flow to make small bucket movements smoothly.

Woods is good equipment; and they used to have an inexpensive thumb for that hoe.
For an old guy - like me - who likes to build dry stone walls, nothing beats a little hoe with a thumb for picking, placing, and general craning. Of course all BHs can dig, but it's the other things they do that make them so handy.
Hope you get it,
rScotty

Well how about that !
Here are 2 old tractor guys and both saying the same things....What were the chances?
rScotty

 

[dp93]

That is exactly ow it works. You will eventually want to make up a simple stand to park the BH on, and then It is no more work than hooking up any other implement.

You are going to love the BH, but they do throw a small tractor around pretty easily. You'll appreciate the strength and rigidity of the subframe.

That PTO-powered BH was quite a bit more expensive originally than the same hoe that used tractor hydraulics. I think you'll like it. The PTO has enough more flow to make small bucket movements smoothly.

Woods is good equipment; and they used to have an inexpensive thumb for that hoe.
For an old guy - like me - who likes to build dry stone walls, nothing beats a little hoe with a thumb for picking, placing, and general craning. Of course all BHs can dig, but it's the other things they do that make them so handy.
Hope you get it,
rScotty

Hello Scotty,
Hope you had a merry Christmas.
You replied to one of my threads a while back and I’m hoping you may have some new suggestions if you have the time.
So I bought the woods BH75 for my Jd790, as you mentioned I also got the crossmember for the front of the subframe. Thanks for the intel.
So here’s the sitch, I have a Great Bend 260 loader on my tractor, I was looking to see if it was going to mate up correctly but it seem to not fit right. Would you happen to know if woods makes a front crossmember for the GB loader frame or should I try some type of fabrication on the one I have. Thanks for you time,
dp

 

[rScotty]

Hello Scotty,
Hope you had a merry Christmas.
You replied to one of my threads a while back and I’m hoping you may have some new suggestions if you have the time.
So I bought the woods BH75 for my Jd790, as you mentioned I also got the crossmember for the front of the subframe. Thanks for the intel.
So here’s the sitch, I have a Great Bend 260 loader on my tractor, I was looking to see if it was going to mate up correctly but it seem to not fit right. Would you happen to know if woods makes a front crossmember for the GB loader frame or should I try some type of fabrication on the one I have. Thanks for you time,
dp

No, I don't know offhand about that crossmember. I'd be surprised if Great Bend didn't have parts to fit a JD790...but if they do not have a member in stock, ask if they have a dimensioned drawing of their subframe parts for the GB260 on the JD790. You know that they probably do, the problem may be getting them to find & send It. But if they would, it sure would save time.

I always seem to end up doing some fabrication myself, even when things should fit. I used to weld the fabs together, but anymore have taken to bolting joints just for convenience. They are much more forgiving. I'm tending toward half and 5/8" diameter short bolts with Nylock nuts in grade 5 or better...from Amazon..

I've also found a local metal-working shop that will take my dimensioned sketches and form a piece of steel to fit. Reasonable prices, too. I'm going to use them for everything from now on. The world just got a lot simpler and less work...
rScotty