Spirol spiral pin for clutch fork pin replacement on Jinma

Forum › Forums › Tractor Operation And Maintenance › Spirol spiral pin for clutch fork pin replacement on Jinma

Viewing 4 reply threads
  • Author
    Posts
    • July 22, 2014 at 12:02 pm #30913
      luke-gr
      Participant
        • Offline

        Just split the 25hp Jinma because of broken clutch fork pin.  I saw a posting by Bob Rooks on another forum about using the Spirol brand roll pin.  I just ordered a pk of 5 from McMaster in an 8mm size.  I also have the stock Jinma coming. 

        Anyone else used the spiral type?  The metric ones have less choice in materials but I got a steel one which hopefully is stronger than stock.  Seems like a stupid place for such an obviously weak link.

      • July 22, 2014 at 1:47 pm #37102
        Bob Rooks
        Participant
          • Offline

          Welcome Luke,

          I believe the design philosophy was to have the weakest link on the outside rather than have to split the tractor to replace the pin(s) on the release fork.

          laugh

          Account deleted.

        • July 22, 2014 at 8:42 pm #37104
          luke-gr
          Participant
            • Offline

            Bob, not sure I followed your post…???

             

            I think the outside and inside use the same roll pins from the factory.  Errr, maybe I just didn't get the joke.embarassed

             

            Seriously, though, am I heading the right route with using a spiral pin instead of the double split pins.

          • July 23, 2014 at 1:44 am #37105
            Bob Rooks
            Participant
              • Offline

              No joke Luke,

              Designing machinery is a complicated process that brings many engineering disciplines into play. Many other considerations are also included including repairability, operability, ergonomics, compatibility, commonality, market trends, and capital accounting just to lame a few.

              I believe the fork uses two pins on the cross shaft, so rather than have a very robust clutch pedal attachment to the cross shaft such as a clamped spline, which would undoubtedly shear the two pins in the yoke necessitating splitting the tractor, the part that would most likely fail was designed to be on the outside of the clutch housing.

              I have used Spirol pins to replace OEM pins in many different applications for years and have never had one fail.

              I assume you replaced the yoke pins with Spirol too?

              laugh

              Account deleted.

            • July 23, 2014 at 10:22 pm #37107
              luke-gr
              Participant
                • Offline

                Bob, thanks for the welcome.  I had some posts here Im sure of it but has been a long time… not sure why Im showing back from scratch…. no matter…

                 

                Still confused on the idea of the weaker link being outside so as to avoid having to split the tractor.  My clutch fork pins broke which necessitated me splitting the tractor.  The single hole on the clutch fork is pinned with a double 8×32 and 5×32 pairing.  The same pin pairing is on the outside of the the bellhousing so I don't see how one set of pins would be less likely to fail than the other since they are the same set of pins inside and outside.  (???)

                 

                I am only planning on replacing the clutch fork pin that broke.  I'll leave the one on the outside and replace it with the stock one if it ever breaks.  The way I see it, Ill have the likely-to-fail part on the outside

            • Author
              Posts
            Viewing 4 reply threads
            • You must be logged in to reply to this topic.