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Tractor Talk Discussion Forum

pulling power

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LamborghiniR904DT

05-02-2007 09:06:27




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How could I estimate the pulling power at the drawbar for a 92hp, 7,700 pound, 4wd tractor on lightly compacted soil?




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jpl

05-04-2007 08:03:19




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 Re: pulling power in reply to LamborghiniR904DT, 05-02-2007 09:06:27  
dont do it, you wont have time to duck.



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Aaron Ford

05-02-2007 22:26:06




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 Re: pulling power in reply to LamborghiniR904DT, 05-02-2007 09:06:27  
Nebraska Test: Test Number:849 Test Date:September 1963 Engine:diesel PTO HP:91.2 Drawbar HP:78.0 Max pull (pounds):10,184

This is based on a 4020. Might be similar, might not.

My money is on the cable breaking. Watch your head.

Aaron



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LamborghiniR904DT

05-04-2007 05:20:54




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 Re: pulling power in reply to Aaron Ford, 05-02-2007 22:26:06  
So I hooked up to the block and tackle last night; the double pulley to the stump and the single pulley to a tree. First, I broke the log chain at the tree. Then I broke a 3/4" wire rope at the tree. Physics says that if my tractor was pulling 9,000# on the 3/8" wire rope, then I had 36,000# at the stump and 27,000# at the tree. By the way, the stump did not budge. Back to digging at its roots.

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LamborghiniR904DT

05-03-2007 05:46:39




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 Re: pulling power in reply to Aaron Ford, 05-02-2007 22:26:06  
I would assume momentum and RPM's make a big difference for the trator pullers and would account for those 200% numbers. The 4020 is supposed to weigh about 8,865#. According to the Nebraska test 849, it pulled 115% of its weight. Considering that running my tractor in 2wd would be comparable; then it might pull 8,855#. That makes sense to me, being that I wouldn't expect to outpull a 4020 in 2wd. The cable is part of a block and tackle setup to pull some stumps. Pulley to pulley; and pulley to tractor lengths will only be about 10-12ft; so I think(hope) that takes some of the danger out of it. I appreciate everyone's input. There are so many variables, from the wire rope's age to the tractor's power distribution to the ground on different soils. I'll take all the safety precautions I can and hook to it in a few days and see what happens. Hopefully, I'll be back to tell you what happens!

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davpal

05-02-2007 17:58:50




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 Re: pulling power in reply to LamborghiniR904DT, 05-02-2007 09:06:27  
Most good tractor pullers on a stone boat can pull around the 200% range. I have seen guys do much more and guys do a little less so I would say a decent 4wd should exert at least 200% pull in comparison to its weight. I would guess around 215%. At that rate your 7700 lb tractor times 215% would exert a pull of 16,555 lbs, or at least it would pull a sled that weighed that much in good conditions.

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LamborghiniR904DT

05-02-2007 11:51:25




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 Re: pulling power in reply to LamborghiniR904DT, 05-02-2007 09:06:27  
Basically, if I hook the tractor to a wire rope and pull, what kind of force will I exert on the wire rope? I realize there are alot of assumptions to make, but I was really wondering if anyone had a rule of thumb for a traction coefficient for this size of tractor on soil. Say if the 3/8" wire rope had an expected strength of 12,000lb, and the tractor is say 8,000lb; it would take a "traction" coefficient of 1.5 before the wire rope would break (for now, let"s ignore momentum and jerking on the wire rope). I don"t think the mechanical power of the tractor itself is at issue here - it will spin out before powering out. I just want to know what force might be exerted on the wire rope. If it"s more than 12,000lb, then I just need to be prepared to duck.

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Rich Va

05-02-2007 11:04:32




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 Re: pulling power in reply to LamborghiniR904DT, 05-02-2007 09:06:27  
I have no idea what it is you want to know. Is your tractor 92 hp at the engine and you're trying to determine drawbar hp? Are you trying to estimate what it will pull compared to a D5 cat or mack truck, or do you want to know how much dead weight it will pull in lightly compacted soil. Maybe some of the tractor pullers will come in and help you out. I think i'll take me another drink.



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Coloken

05-02-2007 09:56:47




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 Re: pulling power in reply to LamborghiniR904DT, 05-02-2007 09:06:27  
Estimate?? 77000 pounds time about 70 or 75 percent. 4 wheel..maybe 80 percent. Maybe about 6000 pounds.



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