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small knuckle boom, no winch, rigging methods, push pull uses ?

Discussion in 'Shop Talk' started by earthscratcher, Jan 15, 2019.

  1. earthscratcher

    earthscratcher Senior Member

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    new to the knuckle boom always used straight boom with winch,so when you need to pick in a small confined area say a engine pull or head pull are guys just using a chain come along to get it straight up. how are pushing pulling with these, what have you built,or use to help assist you with the use of a knuckle boom crane??
     
  2. crane operator

    crane operator Senior Member

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    I like to use a chain fall or chain come a long, I don't find a knuckleboom easy to lift straight up with.
     
  3. Nige

    Nige Senior Member

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    IMHO a knuckle boom is one of the most versatile lifting devices ever invented. We have one at work that we use regaulary to snatch transmissions & differentials from haul trucks. Lifting-wise it'll do 3 tons @ 25ft radius. We have the numbers to show that it's already paid for itself despite the fact we only bought it just over a year ago.

    upload_2019-1-15_20-6-2.png

    However you have to get used to figuring out what function (or functions) you need to be using in order to get the hook to do a certain thing. As crane operator says, it can be difficult to do a straight vertical lift with one, again you have to think about what you’re trying to achieve.

    I'd also suggest it's worthwhile practising with an empty hook and see just what you have to do to make it do certain things, then once you get lifting into tight corners with it you'll know exactly what you need to do.

    That reminds me of an old workmate who was a former air force helicopter pilot. His story about flying helicopters was pretty simple - "Get off the ground (which is nothing more than applying enormous amounts of power to overcome gravity) and get up to a safe height, say about 5-1000ft. Then you hold the joystick in a certain position and carefully watch what the helicopter does - because if you want the helicopter to do that again, that's where you have to put the stick...." :D:D
    Well it may surprise you to learn this but knucklebooms work much the same way .......
     
    Last edited: Jan 15, 2019
  4. wornout wrench

    wornout wrench Senior Member

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    Knuckle booms were pretty much all I ever used in 45 years of pulling wrenches.

    Like Nige said, it can be done, just takes practice and a very easy hand on the controls. Forget cranking the idle up on the engine, run it at an idle so you can get some fine control.

    Depending on the lift, how tight I was and how heavy, I would use a chain fall or a chain come along, but it was not always an option. I snuck the hook into some pretty tight places. The one thing that is nice with a knuckle boom is when you are sneaking the extension in and out, the cable does not move.

    The other option is to have a small winch mounted on it and run the cable through a block hanging off the hook. Had two trucks during my career that had that system, nice option.
     
  5. Nige

    Nige Senior Member

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    IMG_1004.JPG IMG_1007.JPG IMG_1009.JPG

    Here's some photos of pulling a transmission/diff assembly. The knuckleboom is the only thing that will get under the raised haul truck body and centred over the top of the tranny. Load is about 4 tons @ 17ft radius IIRC.
     
  6. RZucker

    RZucker Senior Member

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    I had a truck with a National N45, one of my favorite rigs, I could get the boom right up into a scraper cab to drop a generator or transmission (Wabco 333). and I could run the boom to make a straight up or down lift. Took a bit of practice.
     
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  7. old-iron-habit

    old-iron-habit Senior Member

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    I have loaded a lot of relic machines over the years using a knuckle boom. I run a cable from the hook thru a sheave fastened to the deck on the truck. When I lift the boom it pulls the cable thru the sheave pulling recovered old iron up onto the trailer. It works much better using the main lift at close radius than it does pulling with the jib with the cable straight from the hook. They are indeed a very handy tool.
     
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  8. simonsrplant

    simonsrplant Senior Member

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    I've a knuckle on my current F550...
    Use it with an assortment of straps and slings and chains and cable.
    Basically half a cabinet is lifting and rigging.
    Way more versatile than the conventional set up.
    Said I'd never go back, but, you pay for versatility. It's a big lump of steel and it takes up a lot of space on the frame so you loose cabinet space.
    Also,they don't give them away. My new truck (build in progress) will be a conventional set up.
     
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  9. terex herder

    terex herder Senior Member

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    My tire man uses his knuckle boom as a bead breaker/assist. It will push pretty hard.
     
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  10. Mobiltech

    Mobiltech Senior Member

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    I have added the manual extension to my power telescoping knuckle boom. When I extend it it takes less head room because you don’t have a cylinder attached to it. I take the rotating hook off and put a chain come along right on the pin.
    I had a cable winch on my last knuckle and thought I would have to add one to this new one but found with the wireless control you can lift pretty well straight up by using up and telescope in small increments.
     
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  11. earthscratcher

    earthscratcher Senior Member

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    i can remember with the auto crane straight boom having to get the truck just in the right spot,after only using this knuckle boom twice, it saved me time, just get within 20 feet, and your in the zone. it almost seems light your better of being a little farther away.

    i like the idea of pulling stuff on trailer deck with the cable sheave combo,it seemed to with the auto crane and sheave attached, lots of head room was lost

    mobiltech i like the idea of attaching come along directly to jib end point that will save me some head room. did you fab you own manual pullout or by from manufacturer.
     
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  12. earthscratcher

    earthscratcher Senior Member

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    i just purchased a small micro chain come along, and a assortment of endless slings,any other handy items you guys use for rigging
     
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  13. Mobiltech

    Mobiltech Senior Member

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    I bought my extensions from the manufacturer. I could have probably made one but the shape of the boom is not square . It adds 6 feet of reach and came with another swivel hook for $700 canadian.
     
  14. Mobiltech

    Mobiltech Senior Member

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    20190209_193142.jpg
    You can see the extension here allows me to get in tighter spots without cylinders in the way. Can be taken out easily too.
     
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  15. earthscratcher

    earthscratcher Senior Member

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    mobiltech thanks for the pics,i am going to be in heaven parking in the middle of the shop, be able to pick up anything in the 1000lb range at a near 30ft radius, looks like the shop is coming along well, how tall are your ceilings?

    my service/crane deck is a milron out of edmonton,i am getting ready to add the remote control,new valve body and the electric over hydraulic pumps and batteries,anyway you could snap a photo of your pump/battery setup just not sure where would be the best place to put it on the service deck?

    talking with the pump manufacturer,he said 30sec run time, then you need a 5min stop time,do you find this to be true?
    your amco veba crane is a 5.3 gallon per min crane, my fassi is a 4 gallon per min ,so should be alright with these low gpm pumps?

    batteries?its going to suck batteries down quick, one battery guy said two 6 volt golf cart batteries connected to make 12v another said two 12 connected in series? what are your thoughts on the best battery setups and types?

    mobiltech i like your idea on the shrink wrap for loose hose ends,does it work ok in cold temps,also very interested in your water line air hose setup for the shop?

    should have posted this in electric over hydraulic knucklebone thread after reading it!!
     
  16. Mobiltech

    Mobiltech Senior Member

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    Ceiling is 20 feet.
    I have run my electric pump more then 30 secs at a time. With light load it doesnt get very hot. I do use the pto to unfold the crane and put outriggers down and to pack it away. The electric is good for moving parts around and lifting parts in especially when there is several minutes between movements .
    I have one extra 12 volt battery down in bottom of cabinet where i mounted electric pump and two underhood truck batteries.. I have a charger 20190211_134118.jpg 20190211_134132.jpg hooked up to plug in while crane is in use.
     
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  17. rondig

    rondig Senior Member

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    Love my old girl....use it all the time
     

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