Atlas crane rebuild

  1. mattg Member

    Messages:
    99
    Edinburgh UK
    Hello all,
    I'm in the process of rebuilding an old (1970's) Atlas crane. All the rams required rebuilding, and the slew is seized.

    Here it is the Austin k9 it came with (which is also a project...)
    20190914_135217.jpg
    The crane was cut off
    20191119_105451.jpg
    New ram rods purchased and machined
    20200130_202724.jpg 20200131_130758.jpg
    And slew ram fitted
    20200202_165615.jpg 20200202_165606.jpg

    And tested using a powerpack at 150bar...and the slew still wont budge! Does anyone have any experience with these? I cant see anything holding the slew, but it also looks there is no slew bearing, just a tube inside a tube type arrangement with a single grease nipple.

    Any help appreciated. matt
     
    • 20191207_112331.jpg
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  2. mattg Member

    Messages:
    99
    Edinburgh UK
    Dunno how that last pic got in there, nothing to do with the crane...
     
  3. Kayos

    Kayos Member

    Messages:
    5,540
    Location:
    Yorkshire
    I used to live near where they build the cranes

    Nice looking project
     
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  4. jpmillermatic

    jpmillermatic Member

    Messages:
    971
    USA-NY
    No bearings, eh?

    could it be that corrosion is binding it all together. could you put some pressure on it, then perhaps some heat, penetrating oil and some educated raps with a hammer to loosen things up?

    JP

    PS, I did find several images of atlas cranes and parts on the internet.....
     
  5. barking mat

    barking mat Barking at Pigeons

    Messages:
    2,882
    Location:
    Brittany, The Arz Valley.
    Wow, what a fantastic project, looking forward to seeing this come together.
    What's a slew? I know hydraulics but slew doesn't mean anything to me.

    Good stuff!
     
  6. outofthefire

    outofthefire Member

    Messages:
    2,255
    Leeds
    That trucks awesome should be your priority :thumbup:
     
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  7. eddie49 Member

    Slewing means rotating the vertical post to the left or right. On this one it looks to be done by a hydraulically-driven rack, with the pinion teeth on the post.
     
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  8. scottmk1

    scottmk1 Forum Supporter

    Messages:
    1,360
    Location:
    Scotland
    Corrosion on the king post is what will be seizing it. On the ones I've worked on there was a brass bush in there too.
     
  9. mattg Member

    Messages:
    99
    Edinburgh UK
    Yes next step is to pressurise the ram while heating with oxy fuel. I guess there is a Bush, there just doesn't seem to be enough radial space for an actual bearing. You can see up from underneath the inside diameter of the internal tube - about 100mm, and the od of the outside tube is about 150mm, with 15mm wall thickness approx (eyeballed down the grease nipple thread).
    Yes there a lots of images online but only one or two I can find of these old cranes, and no cutaways or internal parts images - would be pleased to be proved wrong though!!
     
  10. mattg Member

    Messages:
    99
    Edinburgh UK
    Thanks, by slew I mean the axis that swings left and right. In the pictures you can see the rack that drives it.
     
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  11. mattg Member

    Messages:
    99
    Edinburgh UK
    Haha yes, the crane is useful though and I would like to have it operational on my trailer. The truck is progressing and one day I'll get round to posting pictures on here. The can is very rotten, but the engine is running now so can at least take it for a drive (bit tricky as no floor though...). Also it's easier to work on the crane in my lunch hour and with my 11 month old son, he's not great at welding yet.
     
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  12. mattg Member

    Messages:
    99
    Edinburgh UK
    Yes that's what I reckon. Do you know if there should be something retaining the arm from being lifted off the king post? Or should it in theory just slide off?
     
  13. barking mat

    barking mat Barking at Pigeons

    Messages:
    2,882
    Location:
    Brittany, The Arz Valley.
    Thanks all, always learning.
     
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  14. scottmk1

    scottmk1 Forum Supporter

    Messages:
    1,360
    Location:
    Scotland
    I have a very vague recollection that the slew pinion has to be removed from the under side before you can separate the mast from the base. It's been a long time so it's maybe a different crane I'm thinking of?
     
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  15. 8ob

    8ob Forum Supporter

    Messages:
    5,586
    Location:
    moscow on thames
    These smaller cranes normally only have a big circlip on the underside holding them in place, remove that and just lift out the king post. Some have a grove machined into the king post with a bolt in dog on the underside.

    Bob
     
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  16. mattg Member

    Messages:
    99
    Edinburgh UK
    Heres the view from underneath, not a great photo but as you can see no circlip or any other retaining feature... your looking up the inner tube. With a torch you can see the rope of the outer tube.
    20191117_133804.jpg
    I cant see any way of removing the pinion but will need to check tomorrow how its attached
     
  17. 8ob

    8ob Forum Supporter

    Messages:
    5,586
    Location:
    moscow on thames
    Matt do you know the model number? A quick squint at the spare catalogue would show you how that particular model is retained.

    Other than a few orings and washers used to keep out the crud most of the small cranes king posts only have a circlip holding them down.

    Bob
    [​IMG]
     
  18. mattg Member

    Messages:
    99
    Edinburgh UK
    Thanks bob, yes its AK850. 20190915_073431.jpg
    A little bit less faded image from google:
    SmartSelect_20200202-230047_Chrome.jpg
     
  19. doubleboost

    doubleboost Member

    Messages:
    2,956
    Location:
    Newcastle upon Tyne England
    I used to drive an Austin K9
    It was fitted with Holmes jibs
    Later we put a spek frame on to it
    3 litre shere line petrol motor
    Very good off road
    Not so good at stopping
    I will try and find some pictures
     
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  20. Seadog

    Seadog Forum Supporter

    Messages:
    6,253
    Location:
    NE London - UK
    ;)

     
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