My excavating and road building pics--JD 790!!

   / My excavating and road building pics--JD 790!! #1  

Barely Smokin'

Silver Member
Joined
Mar 10, 2009
Messages
103
Location
Nelson County, VA
Tractor
1952 JD 440 backhoe, JD 790
Who says you need a big tractor for earthmoving? ;) I thought I'd take some pics of my 790 this morning, showing some of the projects I've done with it.

As you can see, I've managed to do a fair amount of excavating and earthmoving, all with the box blade and bucket. For the garage approach you see here, the earth moving was done first with scarifiers all the way down and the box blade pitched back (so as to collect the spoil). If you can't tell from the pics, that's some pretty serious clay, too. About 1/3 yd at a time, I would scrape the area that needed to be excavated then, using the box blade, transport the spoil to the area that needed filling/leveling. I would dump consecutive loads in a straight line, driving over top of the previous loads until I had 5-6 loads all piled up in a rough line, then I'd push them all with the bucket to get a rough grade on the next pass. I'd use the box blade level and without scarifiers to achieve final grade, along with back-dragging the front bucket.

Most of that big ditch/embankment, however, was excavated with the front bucket. Most people would think you couldn't do this with a CUT, but here's proof. No teeth on the bucket, either. The trick is to spend some time establishing an initial pitch for the ditch by excavating into it perpendicularly then, once you've created a low trench in otherwise level ground, align one set of tires down in that trench and excavate forward along it's length, being careful to average out the high/low spots with frequent back-dragging. With practice you can develop a 'feel' for how much dirt the bucket can excavate while moving forward. I keep the bucket level and shave about 1/2 - 3/4 inch at a time. I watch the dirt just behind the bucket to gauge how much I'm excavating. Also, the bucket will want to cut more aggressively as it fills with spoil, so you need to constantly lift the bucket up as you go along.

Hydraulic relief is somewhere up around 2500 PSI.

Also, on the topic of "tippiness" in the 790 and CUTs in general---note the banks that I've cut into for veggie gardens and roads. Again, these are done almost exclusively by digging into the bank with the bucket and depositing the spoil on the low side until you achieve a level approach. Once you have the tractor at the correct attitude, you can really get to work. This would include using scarifiers to help rip into the bank. When I cut those roads and terraces, I still had the front and rear tires in the 'narrow' configuration, with the rears filled with water. Sure, it was a little dicey but I was just careful never to get sideways and always keep both implements as low as possible to the ground. In the pics, however, you'll notice that I have since turned both sets of tires around. It seems to make a HUGE difference in stability. I think the only meaningful increase in wear and tear may the added stress on the 4WD when turning in a tight radius.

I rarely use the rear scraper blade for anything (I much prefer the box blade for clearing ditches) although if you turn it around and drive forward it works great for spreading gravel.

Anyway, I hope this inspires you guy out there to think big with your little tractors!

:):):)
 

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   / My excavating and road building pics--JD 790!! #2  
Wow, thats very cool. Thanks for sharing your techniques.

I have a question though, what do you mean by the "hydraulic relief being up near 2500 psi"?

- Sean
 
   / My excavating and road building pics--JD 790!! #3  
Well done Smoken, thanks for the pics. As a fellow 790 owner I enjoy seeing what others accomplish with these fine CUTs.

Bishopknight, this JD model's hydraulic system relief valve pressure is set by adding or removing shims behind a spring. The factory setting is 2050psi. The hydraulic system is capable of handling 2500psi which allows lifting a heaver load.

Here is a thread which goes into more detail.

JD 790 300 loader
 
   / My excavating and road building pics--JD 790!! #4  
Bare, looks awesome.

(you on dial-up ?)
 
   / My excavating and road building pics--JD 790!! #5  
Looks awesome barely. Seeing what you and others have done with a box blade and a 790, REALLY makes me really want a box blade. I already need one, but I get buy for now using a full size, four foot hunk of rail road iron chained to my 72" rear blade. And when I need to 'rip' ground, I use the 3pt cultivator. The rear blade doesn't carry material like a box and the cultivator is not as aggressive as the box rippers, but the combo works so far. Cool pics!
 
   / My excavating and road building pics--JD 790!! #6  
(you on dial-up ?)

I was wondering the same thing.:)

Barely Smokin', the pics are kinda small and hard to see. Got some a little bigger?
 
   / My excavating and road building pics--JD 790!! #7  
Anyway, I hope this inspires you guy out there to think big with your little tractors!
:):):)
WELCOME TO TBN!!!
Nice job!!!

Yeah a small tractor can do large jobs....it might take a little longer but it can be done.

I have did jobs before with my tractor, and the land owner had told me that they had hired a large backhoe to do a job, and they either took to long, or messed the whole place up.

Then they hired me to come in with my 4300 & fix what the larger hoe had messed up.....I guess it all depends on the operator of the equipment.

I have also seen people that needs a ditch dug behind their house or barn....and a large backhoe can't fit, and mine barely would...and they called me to put in the ditch.

I don't work my tractor for hire..but, friends call all the time wanting something done.:D

Thanks for sharing your work and you did a great job!!!
 
   / My excavating and road building pics--JD 790!! #8  
Dirt Ditch,

Thanks for clarifying. I understand now. :)

- BK
 
   / My excavating and road building pics--JD 790!!
  • Thread Starter
#9  
Wow, thats very cool. Thanks for sharing your techniques.

I have a question though, what do you mean by the "hydraulic relief being up near 2500 psi"?

- Sean

Sean, like dirt ditch mentioned, I just meant that increased the overall hydraulic system pressure so that the tractor had a little more oomph. It made a huge difference. Now I can drive into a pile of gravel and lift out as much gravel as the bucket will hold. I still overload it with unusually large logs or something with the pallet forks but, hey, in that case I just get a bigger tractor.....anyway, I recommend the upgrade. Easy, quick, really cheap and a huge difference in performance.
 
   / My excavating and road building pics--JD 790!!
  • Thread Starter
#10  
I was wondering the same thing.:)

Barely Smokin', the pics are kinda small and hard to see. Got some a little bigger?

Hey Dirt Ditch,

Yeah, I don't know what's up with those pics. On my laptop they're much larger but I think this site is compressing them somehow when I upload them. I searched around the site but couldn't find a way to fix this and I can't resize them on this particular computer. Ah well, it is a compact tractor after all....;)
 

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