Kboom Load Charts

I swear Classic and Lumberjack (carl) have all the answers.....any crane....anytime :) my 2 11 year old HEAVILY used EFFER cranes can attest to the fact that you'll want to keep an eye on the stability more than the rating of the boom section/angle (don't get me wrong you cant push limits too far....but you can fudge them a little.) you also should only run the jib overcenter when absolutely necessary (eg. reaching under a wire or limb) and don't upward load if at all possible
 
On fly-jib use, the last section of the boom BEFORE the fly jib was the main limiting factor. The most stressed point that would limit what the fly could lift.

-If I understand this correctly-

So recently, Palfinger thought, hey, lets allow the operator to choose whether that last extension should extended. IF not extended, then put full power to the jib and allow jib to lift more.

They call it DPS, you simply have the switch activated or not.
382121-dps.jpg
 

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see how huge the capacities jump up, just by that last section not extended?

"The Dual Power System (DPS Plus) makes it possible to use the full lifting power of the fly-jib through the use of two pressure ranges on the fly-jib. With it the full lifting power of the fly jib can be used also for crane-jib combinations with a very long outreach if the crane's extension boom is not completely extended.

HOW IT WORKS

The fly-jib can also be operated with two pressure ranges through the use of a special electronic overload cut-off. If the last extension boom of the crane is extended (normal operation), then the lifting power is reduced to protect the crane against overloading. If the last extension boom of the crane is retracted (DPS Plus active), then the system switches automatically to the high pressure range thereby using the full lifting power of the fly-jib."


text credit Palfinger.
 
hey Mark,

After my TCIA expo talk you spoke with me (thanks again for the k-boom back-up support and info you added!)

One thing you said to me that I had never experienced or heard of before.

I had said that fully flat out horizontal was the "weakest" capacity of a k-boom.

After the talk you said that no, actually straight vertical is often the "weakest" because the cylinder will compress at full vertical.

I was baffled by this, because I had not seen this with my crane.

I asked a k-boom Palfinger crane expert and they said that in really old models of k-booms they used to be that way. The cylinders would not hold big weights at vertical. But vertical is a very high capacity in modern k-booms and yes, flat out horizontal was "lowest".

So, ever since you told me that I experimented with mine.

I took a big log and put mine in horizontal form. extending outward, it got to full capacity before I could fully extend my length.

I then lifted the load to vertical, at vertical, I could fully extend my boom to the max and it still only showed 60% capacity.

So, what do you think?

Is Effer not like this? Or am I not understanding something?

(extremely long work day tomorrow, so I might not respond for a day or more)
 
That's because you were at a shorter radius. I think what Mark was talking about was when the boom is so vertical that it could be upward loaded?? Upward load on a boom is BY FAR THE WEAKEST for example if you had the boom vertical with the jib over center. I would never trade my custom 1750 for any crane.......kboom A/T or otherwise
 
[ QUOTE ]
That's because you were at a shorter radius. I think what Mark was talking about was when the boom is so vertical that it could be upward loaded?? Upward load on a boom is BY FAR THE WEAKEST for example if you had the boom vertical with the jib over center. I would never trade my custom 1750 for any crane.......kboom A/T or otherwise

[/ QUOTE ]

I was confused, so he went over it a few times. Quite certain he said hydraulic cylinders would not hold the pressure in vertical if too much weight.

On the fly jib hyperextending past a vertical boom; the crane software program won't ever let the jib go anywhere near that when the other boom is near vertical. Because yes, that can be catastrofic.

Don't tell me yours will allow u to do that.
 
I was referring to the jib cylinders. I could severely overload the jib in a horizontal position but if you boom the jib straight down or up the cylinders may not hold the pressure....This would be true on any brand.
 
Yeah if you had the jib vertical with a huge trunk and pulled up with the jib extension cyls you should be ok.......but if you pulled with the 1st or 2nd knuckle you should put the lock pin in to lock the cyls on really big stuff......you couldn't hurt those cyls with brush picks....only lg trunk picks.
 
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