Case proclain grab repair

  1. F.J.

    F.J. Member

    Messages:
    1,664
    Location:
    Manchester
    My local skip firm has been keeping me busy over the last few months and on Sunday I had to repair the sorting grab as one of the bosses had split completely around.

    The owner did the messy job of splitting the jaws for me the day before so I wasn’t there wasting time and his money but it appeared that it had been welded a few times over the years but this time was too bad to get away with.

    This is where I see a justification for investing in gouging equipment as I had the use slitting discs to carefully remove the boss from the grab, although it had split the whole way round, the amount of welding that had been done was holding it fast in place. Either way, I got it off and dressed everything back and grooved where I needed to.

    I tacked two bits of thick flat bar to the top face of the grab so I could ensure the boss was flush before welding in place then ran one full pass around to hold it while I welded the parent metal where it had split. I then ground this back and welded the boss fully with 7 passes on each side.

    If you notice, there is a porosity hole in the top weld on the outer face of the grab, I didn’t notice at first until I took the picture but I ground it out and re-welded the final ring of weld. Unfortunately I didn’t get a picture of that one as I was annoyed with myself and wanted to crack on and get home for my roast dinner!

    Thanks
     
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    Exuptoy, hunter27, steve t and 3 others like this.
  2. F.J.

    F.J. Member

    Messages:
    1,664
    Location:
    Manchester
    Final picture of the inner face fully welded
     
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  3. Brad93

    Brad93 M J B Engineering

    Messages:
    5,960
    Location:
    Essex
    Decent job. But how do you know the bores are in line now?

    Whenever I’ve done jobs like this the bores are never true due to the distortion from welding.
     
    rory1 likes this.
  4. awemawson Forum Supporter

    Probably so worn that it’s a loose fit anyway:clapping:

    :sheep::sheep::sheep:
     
    slim_boy_fat, F.J. and wyn like this.
  5. F.J.

    F.J. Member

    Messages:
    1,664
    Location:
    Manchester
    The two bores you can see do not share the same pin, the jaws are held in with 4 separate smaller pins. I initially spent a good 30mins looking for 1 big pin so I could slide it in place only to find the 4 small pins sitting in the battery bay if the machine!

    The jaws have since been fitted and are working as they should
     
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