Rock = older than dirt , GA. MAFIA , Dirty
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- gainesville, ga.
Thought DaveP repowered his 819 also, so with with LI one that is six
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I have seen a few where the boom was whacked off just above the extension cylinder pin and another boom was welded to it (the added section was cut 4ft or 5ft below the pin)
Only draw back is now you have 4ft to 5ft more boom all the time - was thinking of making a replaceable extended boom for mine but not quite sure which method I like best yet...
Sam - the more I use the crane truck (wrecker) the more I am tending to agree with you - the reach is pretty decent already and the truck really would need to be bigger and heavier to support a longer stick...Yeah, i think i have to go with the saftey side this time. Cranes are awesome as long as they are used as designed. Modern booms with jibs were designed to be used together.
To those who go ahead, i wish u all the luck in the world. However, please dont work near me. No offense intended.
I was thinking about it and I humbly suggest you may have it wrong. The weight the crane is lifting is the same, regardless of the length of the boom. If you are lifting 10000 lbs @ 10 ft(boom retracted, not sure of the exact number, feel free to correct me) the crane frame has 10000lbs additional on it. If you are lifting 4000 lbs @ 18 ft(max extension) you are still only putting 4000lbs at the crane frame.The 816, at max. extension (18') is rated to lift 4000lb on outriggers, on rubber 3000lb, 800lb at the boom tip would put 8000lb on the boom tip if it was 10' from the boom tip, and as it gets further from the tip, the worse it gets. Cranes (the 816 has a crane) have roughly a 20% overload STRUCTUAL safety factor (not cable & rigging) tipping is 75 to 80%
of rated load, so you can see with just a few MODS you can get into trouble real easy and as I said above, just because something does not happen during the stress caused by overload, DOES NOT mean things were not stressed or that a event won't happen later even with NO overload
You are wrong, weight does matter and where it is, if the 2000 is the max load at 18', with all the safety factors in, the crane thinks it is picking up the safe max at 10'., I have been operating cranes since about 1960, I run into this kind of thinking all the time. A 10' jib x #800 load=8000lbs, if this is PAST the boom tip, the crane would think it has 8000lbs on the tip, it depends what the boom reach is if this would be a overload or not , If you weigh 200lb and stand on a 10' bar to break your lug nuts loose, you are putting 2000lbs on the other end and the lug nuts. In the crane world, there are all kind of charts that cover loads off a jib, boom tips, load/weight transfer, tip extensons DEDUCTIONS ect. A crane boom is designed for a spacific MAX. load, stress, ect. under design conditions, start adding things that CHANGE those loads and stress, and no longer within design conditions, things start to happen, stress, crack, ect. as I said before stress may not cause an event NOW, but in time will bite you in the a$$, could then happen even without much of a load.I was thinking about it and I humbly suggest you may have it wrong. The weight the crane is lifting is the same, regardless of the length of the boom. If you are lifting 4000 lbs @ 10 ft(boom retracted, not sure of the exact number, feel free to correct me) the crane frame has 4000lbs additional on it. If you are lifting 2000 lbs @ 18 ft(max extension) you are still only putting 2000lbs at the crane frame.
HOWEVER, the boom affects the leverage. Once again, thinking at the base of the crane, 4000lbs*10ft=40000ftlbs. That is the maximum leverage, torque, or moment the crane frame can handle. At 18 ft, the load is reduced to stay within the torque limit. In our case, 2000lbs*18ft=36000ftlbs. Continuing on, at 28 ft, the max weight would be 40000ftlbs/28ft= 1428lbs. This does not take into account the weight of the boom.
As you pointed out, the weight of the boom matters, so real load would be less. Probably still not be safe for 800lbs, but certainly not the same as hanging 8000lbs at the tip as you implied.
Not trying to pick a fight, but it is not the weight that matters, but the torque, or the moment in engineering speak.
Ok???? Any reason to bump a 3 year old thread with that?Robert Love in Hendersonville NC has a M819 for sale.
... I'm gonna say "NO", but glad he did - I'd have never have thought to search for this! ... been thinking about it, but assumed it would be shot full of holes by the "safety Police" and therefore not posted.Ok???? Any reason to bump a 3 year old thread with that?
According to the -10,Hey Ron or DH what's the max lift on 819 at 26'?
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