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Subject: stuck clevis pin

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Frank (WNY)    Posted 07-26-2017 at 08:34:14 [URL] [DELETE]        [Reply] [Email]  
  • stuck clevis pin
  • I am trying to remove the lift cover on my 1950 8N. I managed to remove the rocker pin and the left lift arm pin, but the pin that holds the knuckle above the leveling box is frozen solid. The end of the cotter pin end looks mushroomed some but that is no preventing it from moving. I have soaked it in PB blaster, heated it with a propane torch, frozen it with a can of dust off upside down, but it doesn't budge with a drive pin and a 4 pound hammer. It is frozen in the knuckle. I have thought about cutting the cap end off and trying to pound it out that way, but the metal is pretty hard. I'm sure one of you have had this happen. I am worried about breaking the knuckle casting. What am I doing wrong?

    Tim Daley(MI)    Posted 07-26-2017 at 13:16:11 [URL] [DELETE]        [Reply] [No Email]  
  • Re: stuck clevis pin
  • You may be looking at remnants of a broken off cotter pin if it appears 'mushroomed' over. Best to try a pr!ck punch first. A 1/8 HSS Drill next but caution as to length of drill -use a stub length because you don't want anything longer that will flex and break off then you really will have problems. The optimum tool would be a carbide drill but you need the workpiece/part solidly secured and a powerful HP drill unit such as a Bridgeport -something you won't get from a hand-held device. If using carbide and the part moves, you will chip or break the drill. Heat is a last option but know that heating steel and cooling down will work harden the material and then make it harder and harder to machine. You will need a heat source greater than a butane or propane torch too; they just don't get hot enough. A welding torch is perfect. Heat it up then use the pr!ck punch, PB BLASTER on a hot surface will cook and probably ain't goo d to inhale...

    Tim Daley(MI)

    Frank (WNY)    Posted 07-26-2017 at 14:34:19 [URL] [DELETE]        [Reply] [No Email]  
  • Re: stuck clevis pin
  • Thanks Tim, I have a neighbor with a welding torch and think I can talk him into helping me out.

    JMOR    Posted 07-26-2017 at 11:46:32 [URL] [DELETE]        [Reply] [No Email]  
  • Re: stuck clevis pin
  • Get it red hot. Then let it cool before driving it out. Heat & expansion breaks rust bond & cooling allows swelling to subside before trying to move it.

    Frank (WNY)    Posted 07-26-2017 at 13:01:19 [URL] [DELETE]        [Reply] [Email]  
  • Re: stuck clevis pin
  • Thanks JMOR, I will try it tonight.

    Frank (WNY)    Posted 07-26-2017 at 12:53:14 [URL] [DELETE]        [Reply] [Email]  
  • Re: stuck clevis pin
  • Thanks JMOR, I will try it tonight.

    Stumpy    Posted 07-26-2017 at 09:33:34 [URL] [DELETE]        [Reply] [No Email]  
  • Re: stuck clevis pin
  • If it is the cotter pin that is preventing you from removing the pin from the lift arm I would definitely grind the cotter pin off and remove the pin. Work on it in a vise, or find a new, or used pin.

    not really sure if I am understanding exactly.

    Stumpy

    Frank (WNY)    Posted 07-26-2017 at 10:12:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: stuck clevis pin
  • Hi Stumpy, The cotter pin is out, I was referring to the end that the cotter pin hole is at looks mushroomed. I don't think that is what is causing the pin to freeze in the knuckle. I think that it is just rusted real good in the knuckle. I am not worried about saving the pin, just the knuckle. Thanks, Frank

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