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Cannot screw in new grease nipple

Discussion in 'Excavators' started by rdavison39, Jul 21, 2022.

  1. rdavison39

    rdavison39 Well-Known Member

    Joined:
    Oct 22, 2012
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    Occupation:
    Electrical Engineer, employed by BlackBerry
    Location:
    Toronto, Canada
    Hi there - I have a 2015 Bobcat E55 I bought used and I just noticed that one of the grease nipples that greases the pin that holds the bucket was missing. I bought a replacement grease nipple but it would not screw in - almost like the female thread on the arm is stripped. I was thinking there was a reason as to why it was missing....

    To check I had the right size grease nipple and to ensure it wasn't a problem with the grease nipple i just purchased I unscrewed another grease nipple and screwed in the new one I bought (it was fine) so its definitely the female thread on the machine. Its a pretty important piece to grease as the bucket is constantly in use.

    Anyone else had this problem ? Do you get a tap and try and rethread the female thread on the machine ? Other suggestions

    Thx
    Ron greaseNipple3.jpg greaseNipple2.jpg greaseNipple1.jpg
     
  2. kshansen

    kshansen Senior Member

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    Occupation:
    Retired Mechanic in Stone Quarry
    Location:
    Central New York, USA
    Can't say for sure on your machine but 90% of the grease nipples that thread in are 1/8 inch pipe thread.

    So could be the threads in the machine are damaged and just need a bit of cleaning up with a pipe tap. Just in case you are not aware those threads are a tapered thread so I would only turn the tap a couple turns in then try the fitting.
     
  3. rdavison39

    rdavison39 Well-Known Member

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    Occupation:
    Electrical Engineer, employed by BlackBerry
    Location:
    Toronto, Canada
    Okay - thanks. Much appreciated
     
  4. OzDozer

    OzDozer Senior Member

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    56wrench, kshansen, JPV and 1 other person like this.
  5. kshansen

    kshansen Senior Member

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    Dang! I've been out of the trade too long, plum for got about that possibility! Forgot about metric grease fittings, I had a small supply of those I believe for the WA600 Komatsu or was it the JCB 185? Been seven years this last April.
     
    OzDozer likes this.
  6. Pony

    Pony Well-Known Member

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    Location:
    SE Queensland
    Doesn't apply here, but I got caught out the other day with an old seeder, couldn't get imperial or metric to fit, although metric was close just not quite right.
    Bloody things ended up being Whitworth thread.
     
    kshansen likes this.
  7. 56wrench

    56wrench Senior Member

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    And lets not forget the occasional drive-in fitting that uses almost the same size as a 1/4-28 size but is in a place where you can’t see clearly:(
     
    DB2 and kshansen like this.
  8. Tinkerer

    Tinkerer Senior Member

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  9. JD955SC

    JD955SC Senior Member

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    Tap a few turns in to clean up the probable burr
     
  10. crane operator

    crane operator Senior Member

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    Those drive in fittings fit everything. :)
     
    Acoals likes this.
  11. Vetech63

    Vetech63 Senior Member

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    And it works too!
     
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  12. Shimmy1

    Shimmy1 Senior Member

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    Honestly, a few times it's happened where I needed to swap a fitting, and ended up screwing a 1/4" fitting into a metric spot. They fit a bit snug, don't attempt it with an open end wrench. I've never tried installing a metric into a standard, I'm guessing that might not even work.