Hillbilly stump puller VERY effective
Just thought I'd share an interesting piece of junk I recently built. Medium sized portable hydraulic unit running a 6hp pull start diesel, turning a two stage 16gpm hydraulic pump runs two 2.5" cylinders off a two spool load checked DA valve with QD's for hooking up the cylinder lines.
I have pulled stumps out with it that D8's gave up on (after circling and busting all the roots of course) and it will readily BREAK 3/8" grade 70 chain if you double up the cylinders on a single chain. Hauls in a pickup, and pretty easy to build. It's been VERY handy and will pull nearly ANYTHING if you have a deadhead to hook to. I usually hook to a tree, and use a section of worn out excavator rubber track to protect the bark/cambium. This is also VERY effective and usually leaves such minimal marks as to be irrelevant. These also make great pads for unstucking your haul truck.
Mine pulls roughly 20,000 pounds dead pull. This has been an extremely useful piece of equipment to haul to site prep with a mini excavator or loader/backhoe.
And the pictures to accompany the story are coming when?
Right now. Here's a picture of the unit without the chain. I rolled it over to the hydraulics, but didn't feel like dragging chain around for a photo shoot.
Incidentally, anyone with a log splitter pretty much has what they need to do this. Just tap into the splitter's hydraulics to run the cylinders.
I think the biggest stump I've pulled with it has been about 20,000 pounds, but I've pulled bigger out by breaking them piece by piece to deal with a smaller rootball. The biggest was an old growth redwood with three 24-30" second growth stumps, and a handful of third growths off it. This bunch measured about 18 feet across at the widest, and a big root had to be axed in half before it would come out in two pieces. Actually that was the first stump I pulled.
Oh and those blue things are a couple of hooks I used to rig up a safety chain on the last site prep I was on. They were completely destroyed. Look at the angle of the opening. GRADE 70 3/8 CHAIN ONLY for 2.5" cylinders @2000psi
Last edited by totalloser; 06-20-2009 at 08:27 PM.
hmm cool any pics of it in action or maybe even a video...we LIKE videos!
Yeah what he said... so hows that durn thing work?
I put up this thread after finishing up a hairy scary site prep on a 300foot precipice that had a bunch of stumps to pull before doing the excavation and footing. Never thought to take pictures before, but after wrapping up, it occurred to me that I'd NEVER heard of it done this way, and it might interest someone.
I will take some pictures the next time I'm pulling out something big-the only job I have lined up right now is pulling out a herd of puny (12" give or take) fir stumps.
The way it works, is the hydraulic unit provides pressure to run a valve. The valve operates cylinders. The cylinders are attached to a deadhead (like a tree or stable stump) and the other end (business end) is hooked up to a stump that is ringed and all the roots busted. The valve makes the cylinders pull chain between the deadhead and stump, pulling the stump out. Having two cylinders allows you to keep tension on one chain while you extend the other cylinder to hook up for more pull. The I use the excavator track to protect the deadhead from damage.
You could easily use a log splitter to provide the hydraulics end, but I built my own unit for two reasons: 1. I am usually pulling a piece of equipment, and a second trip to tow a log splitter would waste time 2. I wanted a diesel powered unit so it would share fuel with the truck, and my other equipment.
I guess I like the idea of the fantastic fuel efficiency of a diesel, too. About twice, or more that of a air cooled gas engine. The fuel cap didn't like biodiesel, though. Puffed up.
Last edited by totalloser; 06-25-2009 at 02:47 AM.
So what does your machine do that my 50 ton winch on my deere 450 doesn't? Essentially your just using hydraulic power to pull them out, right? I mean other than the fact that you can get your power unit into way tighter quaters than my 450, but I have a loader bucket on the front to help me get them out as well.
I mean don't take me the wrong way, If you have made something that people will pay you to use, congrats thats the goal.
What does it do that a 450 won't do? Ride in the bed of a pickup while towing a small bobcat AND an excavator on a class C. Work in tight quarters, and with minimal equipment impact. Oh and probably pull out bigger stumps.
The first stump I pulled out, a D8 had failed to remove. I probably tried a lot harder, but if a D8 gives up after a few tries, I don't know if a 450 would have much luck. Besides, the limitation of pull with something like this is simply the number/size of cylinders and chain.
But the point is like the name; HILLBILLY stump puller. Stump puller for those that don't have a 7.5 ton 450 crawler to play with. I wouldn't mind having a crawler as well, though!
On the subject of d-8's and stumps... A couple of years agop I was working for an excavation contractor in south central pa. We were building a development out of an old field. There was a hedge row made up of maples and locust and some oaks along the property boundry and the trees got a fair amout of wind.
Well that day they wanted me to bring my stihl in and cut the boundry back a little bit so a swale could go in. Along the path that the swale was going in was about a 20" maple tree, maybe 50' - 60' high.
So I asked the d8r driver how high he liked thr stumps for digging them out, then I asked the guy int the 953 what his preference was, and they both said, "however you want..."
At this point its 10:30, and triming back the hedge is suposed to take all day... and this maple is the last to go...
Now I could have been nice when I cut the maple off, and left them a 5' high stump, but I needed amusment and left them a loggers stump, just as low as I dared....
first off they tried a 953 and that was nothing doing, so the d8r with a single shank came over. His first attempt was blade first and he stalled the crawler. then he spun around and put his ripper down, after about 30 mins of ripping he finally had all he could get to ripped. Back in with the blade, this time it wiggled a little... To get that little maple stump out they both had to work together, but they got it after about 1.5 hours of playing with it. Maybe I should have been nice and left them a 5' stump.
Here's a better illustration of the pulling power of this machine. This (and broken chains) is why I only use grade 70, now. But the rams pulled the hooks open, and ruined the chain, too.
The reason I chose 2.5" cylinders and only 3/8" chain is the portability issue. 2.5"x24" stroke cylinders can be picked up fairly easily, and picking up 30 feet of 1/2" chain would be difficult... at least for me!
I actually originally used this setup running off the hydraulics on my JD790, but I couldn't run the tractor and stump pull at the same time. The portable hydraulic unit keeps the tractor(s) mobile while reefing on the stump.
Last edited by totalloser; 06-30-2009 at 09:18 PM.
I'm thinking of a safety improvement, radio remote control for the power pack, so you could be in a bunker when the next chain gives out!
Thanks for the post.
maybe you don't need remote control.......just longer hoses? I'm not sure how far the chains are flying when they break but I would say depending on the length, maybe twice the working length of the chains should be suffcient for your hydraulic line. Also I would check your chains to see the tensil rating of each chain and then match accordingly, then add your safety factor of two or three times the peak working load.
I've built several rams and tools in my shop and used the following formula to good results with no breakage to date.
Hydraulic pressure force
output pressure of pump times area of cylinder ram. equal total force applied to each ram.
ex: 1500 psi x 3" x 3.14 = 14150 lbs of force for work done
Then match your chains to be twice the load possible applied shouldn't break any more chains.
hope this helps, just my two cents I guess.
I appreciate the input. Glad someone is at least getting a kick out of it!
The hydraulic lines are long enough to keep you out of the way. The chains don't stretch much, so when they let go it's nothing like breaking a cable which would take your head off. The two ends just pile up by the deadhead and stump. But the broken link sails off at a 90 degree angle with some force. Plenty enough to hurt you.
My setup is actually set up to peak at 2200psi on a two stage pump, so it delivers 16gpm, but drops down to about 4gpm at full pressure. With 2.5" cylinders with a 1.25" rod, the math works out like this: (Pie radius squared of the cylinder diameter)-(pie radius squared of the rod diameter) multiplied by 2200psi works out to about 8100 pounds dead pull per cylinder. So not quite what I originally claimed. Doubled up, mine only pulls 16200 as currently set up. However, more cylinders/chains could easily be added to nearly infinitely increase the pull.
This significantly overrates the chain, but the working load of the chain has a safety factor (probably 3:1 or so), and shock loads to consider. Hydraulics are very friendly in this regard, transmitting very little in the way of shock loads. The way I have broken the tougher gr70 chain was when a stump was aaaaalmost coming out, and so I cheated and doubled up the cylinders on a single chain and overrated the chain. The nice thing about gr70 is that it doesn't bend, it breaks. So all you do is remove a weak fuse! Yes, and I still have all my teeth...
I would post up some pics, but site prep has been at a standstill for a while now. Rough times. I can't believe in retrospect, that I didn't take pics. I can think of a few choice Kodak moments that have passed me by.
totalloser, a few questions:
Is it to-tall-o-ser or total-loser?
Is there a Fort Bragg in Calif? There is a large Army base in NC by that name.
Now to your red neck stump puller. So the retraction stroke is the all the pull power and the retraction stroke is less powerful than the extension stroke.
If I understand all you have written, you may have solved my how do I pull some of my stumps.