non tree related crane fail in my area

I'm not getting a tape out no, but if I can stick a steel toe under a tire +\- 3" I call good. There's no advantage or reason not to go by the book. I'm not being a smart arse either but I think you may be underestimating how heavy the tires, wheels and axles are and how thier contribution to the counterweight will effect your stability.
 
"tires are to be clear of ground" period. not my statement-the manufacturers. the crane tipping moment does not change no matter how high its jacked as long as the cribbing, mats, dunnage provides a no-shifting stabile base. period. not my call- its physics. not arguing- just stating facts that you seem to be unaware of. in the past, before front outriggers were offered for 360 chart rating, it was very common for ops to block under front wheels for stability to offset the engine weight ahead of turret centerline, which is the sole purpose of the front stabilizer. (not for jacking- hydraulic system relief is set lower for frt jack.)
 
I think your both splitting hairs,because we're all saying the same thing but,ok have it your way.I wasn't trying to get into a pissing contest here,I have over 10,000 hrs operating a crane as I'm sure you guys do also.Go back and re read what I said I really don't think you understand what I'm saying.I never said not to go by the book,I never said I don't go by the book.Big wood says I underestimate how heavy the rear ends are and how they are needed for counterweight,how do you arrive at that assumption?So your saying if my truck was 1 inch off the ground and yours was 3.then I'm unsafe and your not?
 
I often have at least some of the tires in the air, due to the unlevel setup areas I have to contend with in a mountainous region. But, the rare times I'm on level ground, I take the weight fully off the suspension but the tires are still on the ground,just, call it almost clear of the ground. I won't argue with the manufacturers, but my load chart for my 101S doesn't say anything about lifting all the tires clear of the ground (not to say that Manitex doesn't claim that, it's just in my paperwork).

It DOES say full capacity over the front (no outrigger required for this) UNLESS the front tires are in the air. In several years now of running this rig, I've learned what I can do over the front, even with the front tires in the air, and it's quite a bit as per picking a truss or three up or something pretty light out to 50' or so.

I always try to make any significant picks, 75% and higher of the chart, directly off and over the rear, that's where I feel most stable anyway. Can't see the tires making much difference in that position, off the side more so. Can't go wrong going with whatever the manufacturer says though I'm not sure they say that for my crane.
 
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I often have at least some of the tires in the air, due to the unlevel setup areas I have to contend with in a mountainous region. But, the rare times I'm on level ground, I take the weight fully off the suspension but the tires are still on the ground,just, call it almost clear of the ground. I won't argue with the manufacturers, but my load chart for my 101S doesn't say anything about lifting all the tires clear of the ground (not to say that Manitex doesn't claim that, it's just in my paperwork).

It DOES say full capacity over the front (no outrigger required for this) UNLESS the front tires are in the air. In several years now of running this rig, I've learned what I can do over the front, even with the front tires in the air, and it's quite a bit as per picking a truss or three up or something pretty light out to 50' or so.

I always try to make any significant picks, 75% and higher of the chart, directly off and over the rear, that's where I feel most stable anyway. Can't see the tires making much difference in that position, off the side more so. Can't go wrong going with whatever the manufacturer says though I'm not sure they say that for my crane.

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your walking into an ambush here courierguy,lol probably best to steer clear of this one.by the way I sent you a PM about your airplane,in case you didn't see it.
 
Terex TC-125
The manual states:
Extend all outriggers to firm contact with solid level surface, leveling vehicle
In the event that other conditions exist such as: loose or sandy soil you will be required to restrict your operations. In some areas you may be able to level your crane with bearing pads or blocks. These pads must be made of strong material.....and should not exceed 2" in thickness. If pads are used the outrigger spread will be shortened and will effect the stability of your crane.


This is directly from the operators manual.

Always follow the manufacturer recommendations.
 
The boom was 92' with a jib and an extension. Mine was 1979. yes 12.5ton.

My point in my original post was more to not make generalizations about to be used with every crane but use the specific crane manuals.
 
these statements by terex (i would think on an older machine with short boom) show how much the manufacturers have changed their user instructions. firm contact on a solid LEVEL surface-who has the opportunity to do this often? restrict operations on loose, sandy soil-how much restriction is safe? pads are to be made of a strong material-pretty ambiguous at best. all and all it left a lot up to the operator. the directions have changed in great detail about every aspect of crane operations-directed mainly by the legal dept not the engineering dept of each and every manufacturer. we all know that everything in life is the details and the bigger the crane you operate the more detail-orientated you need to be. when there is a crane problem all the details are reviewed during the investigation.
 
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