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Boom-Arm link pin

Discussion in 'Excavators' started by michel, May 1, 2011.

  1. michel

    michel Well-Known Member

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    Mar 10, 2011
    Messages:
    75
    Location:
    belguim
    Recently i noticed that on PC300-7 excavators the pin that link the arm and the boom usually brakes or rotates and especially when using hydraulic breaker, Any idea? Thx
     
  2. jey_c

    jey_c Senior Member

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    Oct 21, 2010
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    Location:
    france
    Check the clearance of the pin
     
  3. Chris5500

    Chris5500 Well-Known Member

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    Oct 23, 2009
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    217
    Occupation:
    Plant Mechanic
    Location:
    Australia
    Do you mean PC300-7's in general or a single PC300-7?

    What do you want idea's on?
     
  4. michel

    michel Well-Known Member

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    Mar 10, 2011
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    Location:
    belguim
    In general, and yes of course i need to know why
     
  5. Dr Komatsu

    Dr Komatsu Well-Known Member

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    Sep 29, 2010
    Messages:
    65
    Location:
    United Kingdom
    Pin Fault

    Not a common problem on any P290/340/350's on breakers in UK, i assume the boom and arm are in the correct position when operating the breaker as this puts excess pressure on pins and bushes if breaker and machine are not being used correctly.
     
  6. willie59

    willie59 Super Moderator

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    Dec 21, 2008
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    Occupation:
    Service Manager
    Location:
    Knoxville TN

    Quite true, such as, never operate a breaker with arm fully extended with arm cylinder bottomed out. With cylinder piston bottomed out, there is no longer any hydraulic cushion, all the stress of breaker impact is on cylinder piston and arm/boom pivot pin.