Was doing some reading when I ran across a mention of boom deflection. So I dug up a couple of pictures that will explain it. Grove 5150b with 2000lbs of chart left.
This is when you need to be confident with your equipment.
And in your radio man, if your lifting over a wall. Have you seen the photo of the crane laying IN the house after trying to set a pool in the back yard? Makes my stomach turn & wakes me in the middle of the night with a jerk. I had a bundle of decking slide out of a sling & land on the cab when I first started running a cherry picker. Good lesson in what not to do. I'll post the photo if I can find it. Lucky to have lived through the lesson. C Ya, Patrol Man (Dan) Goodearth13
Those old Grove AT's were tough as nails ...thats still the old Krupp ideology working there .. The new stuff bends enough to make ya wanna puke..
It takes some getting used to when flagging. When landing a load,Wire chokers will damage some stuff we set.So its a little cable and a little boom and so on to keep the hook centered over the load
Yup:thumbsup
That must have a pretty darn good line pull.....only a single part'a line n she's tweeked!.....can see the swing away is on but, still a guy would think it shouldn't bend that far...haha!
little cable. little boom sucks big time when setting a load... my last job, the load was close to the boom and the ceiling... little this little that a real pain in the levers. 30 minutes to an hour to set the load.
talk about banna boom.....is that really safe?
Yes Sir it must be , Think that one pictured was a new machine in 1999
Thats engineering for ya. I sure they could of stiffen up the boom a bit but that would of added weight decreasing the lift capacity or made the metal more brittle by hardening it.
Heres deflection Heres the 31000 boom
ben94f150 , Do you know weather or not that has mid point suspension ?
I don't believe it does because up in the air with that boom it bows looks the same
I know nothing about that machine so I'm full of questions....Thanks for the info
Its a awesome crane. Boom section are 30 feet because would weight to much to transport. Its basically a ringer with crawlers under it. Like the old manitowoc 7000 was. The counterweight positions it self as the load is picked.
A thread on the 31000: HeavyEquipmentForums
this is a pic of the model,
It's funny, because the newer ones, since the late 90's or so are designed with the unloaded boom going up and they still deflects a bunch! Our 550 ton Grove has the Mega Wing Lift attachment that helps but there's still some deflection.
The old 7,000? I have a flier for that 7,000 from '82, showing it at the factory, no sheet metal to cover the drums, with at least 300 or maybe even 400' of main, and a 100' jib doing a test lift of 30 tons, from the jib at a 120' radius. It had a huge turntable too!