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Thread: Thirty starting crank shaft

  1. #1
    Join Date
    Nov 2006
    Location
    McBEE, SC
    Posts
    2,267

    Default Thirty starting crank shaft

    Ok, back to serious. Both starter shafts I have for Cat thirty have been bent and worn out. I would like to save the jaw. So has anyone here done a cut, weld, & lathe job to fix one up. ? This one looks like it has been machined before with a machete Also the bronze bearing collar will need some work.
    Attached Images Attached Images
    D2 5u & 3J
    212 9T
    RD4
    D4 7J & 7U
    R4 4G
    Gas 35's
    Diesel 35
    Diesel 40
    Gas 50's 5A
    Diesel 50 1E1755
    Diesel 75
    D 8800 power unit 9J 6113SP
    LeTourneau D4 tournapull/Q Carryall
    Letourneau D Carryall's
    LaPlant-Choate CAB-97

  2. #2
    Join Date
    Jul 2014
    Posts
    236

    Default 30 crank

    Remove old shaft from jaw and make new shaft , simple enough, cut and weld is not as good

  3. #3
    Join Date
    Nov 2006
    Location
    West Jordan, Utah
    Posts
    304

    Default

    I have one where we cut the bad shaft off, bored the jaw part, made a new shaft and welded it on the jaw end. It is still on the shelf but I will not get pictures until tonight and most likely will not post them until Monday.
    Thanks
    Ken

  4. #4
    Join Date
    Feb 2018
    Location
    Missoula Mt
    Posts
    219

    Smile

    !. Cut shaft at jaw
    2. bore jaw .007 small
    3. cut new shaft to right size
    4. heat jaw and insert shaft ( shrink fit)5. Ride off into sun set and have a beer
    ....WA7OPY

  5. #5
    Join Date
    Jan 2017
    Posts
    388

    Default thirty crank

    Make sure you index the jaw to shaft position correctly.
    you want it to engage and release at the correct positions

    a few degrees off will put you in bad position when pulling it over the top.

    Remember - right hand on radiator (air cleaner inlet - makes a choke) - pull crank toward you with the left, keeps you out of harms way if she kicks!

    cts

  6. #6
    Join Date
    Nov 2006
    Location
    McBEE, SC
    Posts
    2,267

    Default

    Thanks for all your great ideas. The one that didn't come immediately to mind was indexing the woodruff keyway to the jaw position. Since it has been welded before, I will have to take special care, perhaps I need to get the gear cover off the parts engine to see if it is a better sample.
    D2 5u & 3J
    212 9T
    RD4
    D4 7J & 7U
    R4 4G
    Gas 35's
    Diesel 35
    Diesel 40
    Gas 50's 5A
    Diesel 50 1E1755
    Diesel 75
    D 8800 power unit 9J 6113SP
    LeTourneau D4 tournapull/Q Carryall
    Letourneau D Carryall's
    LaPlant-Choate CAB-97

  7. #7
    Join Date
    Nov 2006
    Location
    Lansing,Mi suburbs
    Posts
    1,110

    Default

    I did it for one of mine, cut the shaft of, made a new shaft with bevel on the end for welding and a 1/4 inch pin for sticking out the end to match up with a center drilling in the paw. Indexing is important, then Tig welded.. made new bearing/ flange assembly, worked like a charm

  8. #8
    Join Date
    Nov 2006
    Location
    McBEE, SC
    Posts
    2,267

    Default

    Just a little cutting and welding today. The shaft was plenty oversize to allow for welding mis alignment and an old beat up exterior. Turns out it was shiny on the inside after all.
    This is how I indexed the shaft for cutting the keyway.20190621_165652.jpg
    Attached Images Attached Images
    Last edited by STEPHEN; 06-21-2019 at 03:45 PM.
    D2 5u & 3J
    212 9T
    RD4
    D4 7J & 7U
    R4 4G
    Gas 35's
    Diesel 35
    Diesel 40
    Gas 50's 5A
    Diesel 50 1E1755
    Diesel 75
    D 8800 power unit 9J 6113SP
    LeTourneau D4 tournapull/Q Carryall
    Letourneau D Carryall's
    LaPlant-Choate CAB-97

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