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Cat 325BL: Educate me on a drifting swing system

Discussion in 'Excavators' started by LCA078, Oct 31, 2020.

  1. LCA078

    LCA078 Well-Known Member

    Joined:
    Sep 29, 2019
    Messages:
    224
    Location:
    Austin, TX
    Never really noticed I had a problem with the swing until I was on a slope and saw the hoe would drift, or really free-swing, down hill when I was off the controls. On level ground it seems fine and appears to brake or slow down correctly during a full speed swing...but I'm not an experienced operator so maybe my 'fine' isn't really fine.

    I thought there was a swing brake or equivalent to prevent down-hill free-swing but have no idea where to start looking to troubleshoot. I assume it could be as simple as a bad electrical connection or some really expensive hydraulic issue.

    What ya'll recommend?
     
  2. DEMLONE70

    DEMLONE70 Senior Member

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    Location:
    Belgium
    Serial number ?
     
  3. John C.

    John C. Senior Member

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    Occupation:
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    A lot of those machines had a soft swing function installed from the factory. Check all the rocker switches on the right side console. A serial number will allow some people here to look up what your machine originally had from the factory. As far as the swing brake goes, it is actually a swing parking brake. It is spring applied and hydraulic released and only applies about seven seconds after you stop operating everything.
     
  4. LCA078

    LCA078 Well-Known Member

    Joined:
    Sep 29, 2019
    Messages:
    224
    Location:
    Austin, TX
    serial number in my signature but i'll add here too:
    Caterpillar 325BL Serial *2JR01724*

    John- Are you referring to the Fine Swing Control Rocker?
    upload_2020-10-31_11-45-10.png
    I assume you're suggesting I keep this rocker off (pushed to the left)? I guess this is also where I get confused because I see swing brake and assume this is an immediate acting swing brake instead of the 7-second parking brake.
     
  5. Jam

    Jam Well-Known Member

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    Nov 11, 2009
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    Occupation:
    Building contractor
    Location:
    Cork, Ireland
    You can check the swing brake by dropping the deadman while its on a slope starting to creep on its own and see does it stop abruptly. I had a b series years ago that two of the swing motor pistons poped off their slipper feet which cased it to free swing on a slope. New pistons and a cam plate sorted it out
     
  6. uffex

    uffex Senior Member

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    Lincoln UK
    Good day
    You may find the attached a useful starting point.
    Kind regards
    Uffex
     

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