What is better?Short boom, low angle or long boom

Just give us the hook,load wont be that big,stubby jib,long jib whatever,just want to get the job done/go home!
 
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The load chart on my Terex 4792 says "It is safe to attempt to telescope any load that is within the limits of the load chart". That's verbatim straight off the chart,...

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If thats what your chart reads then fine.

The manual for the larger cranes that I have run specifically say not to extend or retract the boom while it is under load. But with the smaller ones (both straight stick and knuckle) I have retracted the boom, although they were only used for loading wood, not for the removal.

My main point is still read the chart, know the chart, understand the chart. Obviously you do that, but I don't think anyone can make a blanket statement that its always safe to extend or retract the boom while under load. It varies with each crane.

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...how are you going to run a crane and not telescope in with a load on the hook.

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Done it for years.
 
If it says it on your chart it should be safe, but I still would not do it because of the excess of wear on the slides, most stick boom cranes are designed for extending your boom to the required length and leaving at that length all day.
 
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how are you going to run a crane and not telescope in with a load on the hook.

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I don't understand your question boom up to bring the load towards you and boom down to move it away from you. when you are moving something away from you extend your boom to the requred length before you pick it.
 
If I have 92' of boom out and take a log out of the top of the tree and then want to put the log on the bed of the truck I have to telescope in as would any boom truck. At the steepest boom angle at full extension the radius is beyond the bed. Winch up, telescope in holds the load steady and brings it toward the truck. They even design it that moving both levers full(winch up, telescope in) holds the load steady.
 
Re: What is better?Short boom, low angle or long b

the manufacturer would love for you to do that all day, then they can sell you more wear pads. if you baby your gear then set the load down and boom down and scope in
 
Re: What is better?Short boom, low angle or long b

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the manufacturer would love for you to do that all day, then they can sell you more wear pads. if you baby your gear then set the load down and boom down and scope in

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I'd rather just be productive and use the equipment as it was designed and intended rather than waste time worrying that I might take an additional 5 hrs off the life of a wear pad that has a 2000 hr. life. Keep your booms lubed and the additional wear is negligable.
 
Re: What is better?Short boom, low angle or long b

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we put way more hrs. than 2000 on our cranes and never had to change wear pads.

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ditto
 
Re: What is better?Short boom, low angle or long b

We don't lube the sliding sections of the boom,it just attracts dirt to wear it out quicker.Thousands of hours and the wear pads look great.I never scope in with a load,I put all the logs on the grund as we go,then load them all when it's time to rake up.That's just the way I was taught.
 
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If I have 92' of boom out and take a log out of the top of the tree and then want to put the log on the bed of the truck I have to telescope in as would any boom truck. At the steepest boom angle at full extension the radius is beyond the bed. Winch up, telescope in holds the load steady and brings it toward the truck. They even design it that moving both levers full(winch up, telescope in) holds the load steady.

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Whole different deal there, of course if you have all your stick out your load radius will not reach the bed, even at max boom up. The discussion started about extending/retracting the boom as opposed to boom up/down and using the winch to position the hook. Just today I had 85' of stick out to reach the far end of the house, and the next pick was a sheeted gable 5' from the rig, I boomed up to 80 degrees and then retracted as required to reach. What I don't do is run the boom out and in if I can boom up/dn and winch.

Terex says lube the pads, National says theirs are self lubing, all I know that HDPE (high density polyethelene) is tough slippery stuff, I personally use a light spray lube very sparingly and in frequently, and mostly just on the bottom pads. I too try to run it out and in at a steeper angle if possible, its just makes sense that'd be less wear on things. Replacing the wears pads can be a bit more work then imagined, note the varying thickness of the shims, all must be be setup so everything is straight, pretty much set to a datum point transiting the truck centerline, I've never wore a set out but I've read the how to on it, and its a bit involved if done properly.

Having just chassis greased my 22 ton today , changed the oil etc, I hit the cranes zerts, and didn't touch the pads, it always amazes me how simple they (boom trucks) are, my Kubota tractor with loader and backhoe has a lot more points to grease!
 
Check very carefully there could be more than you think, when we bought our 38 ton manitex we asked the dealer for a lube diagram, never got one, we asked a mechanic on the dealers staff and he said " I think theres 5, could be 6"

We have two years in with this machine, and we're still finding grease fittings.

We use STP on the boom and outriggers, spray grease on the rotation gear and krown rust oil on the winch line.
 
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By the way Courierguy did you see the thread Crane Failure in Awakenings? That was a manitex 22 ton.

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Tell me how and what "Awakenings" is and I'll check it out...
 
Yeah, the zert at the base of the boom, over the turret, slightly inside the boom, is easily overlooked unless you know its there. It would be for the boom extention cable pulley shaft.

I just recently became aware that on my Cat 3126, there is a zert under an inspection plate for lubing the clutch throwout bearing, makes perfect sense once you're aware of it, but you sure can't see it with a casual look under the truck. I used to have my rig serviced by a diesel shop, and have just recently begun my own oil changes (work slowdown=save money). I've always done the crane myself.

I like Terex's permanent lube decals on the rigs, they can't be lost or misplaced. Manitex must want to keep it a secret or something!


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Check very carefully there could be more than you think, when we bought our 38 ton manitex we asked the dealer for a lube diagram, never got one, we asked a mechanic on the dealers staff and he said " I think theres 5, could be 6"

We have two years in with this machine, and we're still finding grease fittings.

We use STP on the boom and outriggers, spray grease on the rotation gear and krown rust oil on the winch line.

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One more time classictruckman: I went to the "awakenings" page (never noticed that before, pretty sobering stuff....) and could not find anything titled "crane failure", did a search, still no go. As it was a Manitex 22 ton, maybe like my Manitex 22 ton, I am very interested and would appreciate any further help in finding it.

I do remember something about the earlier 22 ton riders having a mod to the base, which resulted in major srength gain there. I do know mine has the mod, as do all manufactured sinc the fix came about. Thanks again for the help
 
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One more time classictruckman: I went to the "awakenings" page (never noticed that before, pretty sobering stuff....) and could not find anything titled "crane failure", did a search, still no go. As it was a Manitex 22 ton, maybe like my Manitex 22 ton, I am very interested and would appreciate any further help in finding it.

I do remember something about the earlier 22 ton riders having a mod to the base, which resulted in major srength gain there. I do know mine has the mod, as do all manufactured sinc the fix came about. Thanks again for the help

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http://www.treebuzz.com/forum/showflat.php?Cat=0&Number=165849&page=2&fpart=2&vc=1
 
Thanks for the help in bringing that to my attention guys.
I missed it in the awakenings forum as I never check in anywhere but here.

There was a mod, that was factory mandated, to the turret base, mine has that mod. The dealer I bought my used unit from ran 22101's for a lot of years in Florida and in New York, and was a real wealth of practical knowledge. At the time I took everything he said with a very large grain of salt, but everything he said has since proved to be correct. I had heard something about it (the mod/problem) and it was the first thing I asked about. He gave me a "what, you think I'm stupid?", look and went on to tell me all about it and of course it was dealt with. He went on to say that with the mod, it is now way overbuilt there. Good to know. Overloading was the original cause of the problem, ran in the load chart no problems were experienced with the old setup. THATS WHAT HE SAID, DON'T FLAME Me!!! The experience related would seem to be at odds with that... I am baffled why the mod was not installed pror to the incident. I know from the experimental aircraft world there is nothing like a structural failure to get peoples attention and a fix damn fast. Somehow that unit slipped through the cracks.
 
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