I think I have this picture thing figured out. Chris
I'll put some more up tomorrow . Once I figured it out it's pretty easy. Chris
fantastic pics, bud.
zeeklu, did you reeve the 3 part like that so you can go to 4 quickly? It’s not the right way to do a 3 part on the head from the pic that I see here. Just wondering.
Very nice photos and can u give the cost of these Cranes??
I don't follow you.What is wrong? Chris
On a wooden bridge ??
It's oak,it's plenty strong! They are mats the utility uses made of 2 layers of 2"X6" bolted together over soft spots. They aren't tightly spaced so they pick back up pretty easy . They set them witk a Bobcat with 8' fork blades . Chris
Here's a little better picture of the mats. Chris
I've been told that the big one is around $3,000,000 and the smaller one was around $1,000,000. Chris
No doubt these pics are very interesting. Thanks for sharing
I mention it because the head is reeved offset from the centerline of the head it self. The block is reeved ‘centered and balanced' on all 3 parts, but the head has part #1 on the far right and part #3 in the center. That isn’t as balanced of a 3 part line reeving on the head section if you took the part #2 up thru the far left on the head. Then that would load the head equally from side to side. One part far left, one part far right and the last one going down centered on the blocks anchor point. It’s close to being balanced as it is in this picture, and if you weren’t loading it up to near your line pull limit for the 3 part then it would be fine like you have it. But if I was making a near capacity lift for the 3 part reeving then I would not do it the way it is shown. As it is here the left half of the head has no suspended parts of line at all, but the center has one and part of the 2nd and none of the first The rest is on the right of center. So it’s not balanced on the head, but is balanced on the block. We each have our way of doing things and I wondered if you were aware of the concentric head reeving there?
you are correct gostr8r. his reeving would be more properly balanced by moving the live line one sheave to the left on the boom head.
Yes, it would be an improvement db1612.
It's reeved according to the Liebherr Operators Manual. It does look odd but it's done according to factory specs. The live line is on the second sheave and parts 2 and 3 are on sheave 5 . There is 7 sheaves on the head . Chris
Then that’s how it should be. The manufacturer always trumps chumps like me!
don't sell yourself short. most of the time when engineers screw something up, they eventually rely on seasoned operators and mechanics to straighten the problem out with a stiff dose of experience and common sense tempered by computer calculations from the engineers and designers. (so they can claim they solved the problem that everyone has noticed but the factory swears never existed!)
Liebherr engineers will Never admit there is a problem! No way no how . We had a LTM1300 Liebherr that wouldn't wrap right on the drum. The factory was out at least 6 times trying all kinds of band-aids. Extra cheek weights on the hook block and a bunch of other silly stuff. After some research we learned the European cable spec was a little different,about a 1/2 MM smaller so each layer on a European spec cranes drum would make a nice snug layer while our US spec drum would get progressively looser with each additional layer. After a few layers the cable would start diving into the lower layers as the line pull would increase. Real fun with 150 ton on the hook! Chris
True. I’ve seen a few goofs from the factories in my time in the biz’. Rare but it happens. Grove Operator’s Manuals from the late 80’s until recently were completely wrong in their instructions and calculating safe net loads.
The crane is an LTM1400-7.1. All LIEBHERR cranes have very detailed reeving plans in the Operators Manuals. There should never be any guess work involved because you should never deviate from the reeving plans, ever.
There is no such thing as a European spec drum or a US spec drum. If anything the drum was flawed during manufacture.
most euro and japanese machines have lagging that is machined to work best with metric sized wire rope. american machines historically have had lagging that was set up for imperial measurements, (5/8,3/4,7/8,1,etc) each works best when used with what it was designed for, although metric sizing has become more prevalent. (all started years back with tower cranes from europe with their high-performance, compacted strand rope).
What I should have said in reference to the "drum" being Euro or US spec was that LIEBHERR (or any of the European machines) would not deviate from their metric specifications to pacify us in America. If a rental company uses a rope that is fractional in size to replace an O.E. rope then they will have to deal with it. In my experience if the rope is winding with gaps between wraps it sometimes is the end where the lagging kicks the rope over, that area could have a dimensional mistake from its manufacture.
It was a standard drum. Not U.S. verses European. It was the cable that was different. It was factory U.S. spec cable. Chris