Clutch Adjustment

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    • September 12, 2012 at 5:54 pm #30654
      Pinetr5000
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        I have a Jinma 254 tractor that needs a clutch adjustment.  I was not able to find anything in the past forum acticles on “how to”.  My problem is like many others not being able to engage my pto while the engine is running.   I'm able to disengage the pto while the engine is running.  Showing the proper clutch adjustment method will help many others.

        Thanks,

        Pinetr5000 

      • September 12, 2012 at 9:40 pm #35072
        quicksandfarmer
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          As the PTO clutch disk wears you have to push the pedal in further to get it to release all the way. There is a bolt under the pedal that limits how far in you can push the pedal. You need to adjust that bolt.

           

          Here's the way I like to do it: Get a helper. With the tractor off, put the PTO in gear. Remove the clutch switch. Have your helper push the clutch in all the way and go to the back of the tractor and see if you can turn the PTO output shaft. Adjust the bolt to the tightest setting where you can freely turn the output shaft. Put the clutch switch back and adjust it so that it closes when the pedal is against the bolt. If you put the switch in too much it will act as the clutch stop and you'll smash it when you stomp on the pedal.

           

          If the PTO clutch needs adjusting it's likely the drive clutch does as well. There needs to be a gap between the clutch bearing and the clutch fork, otherwise the bearing will wear out quickly. As the clutch disk wears that gap shrinks. There is an inspection port on the side of the tractor. (Sometimes the port cover is removed and the holes are used for a front-end-loader support.) Remove the cover. With the pedal released there should be a .1″ gap between the bearing and the clutch fingers. Adjust the length of the rod that attaches to the clutch pedal to get that gap to 0.1″ when the pedal is released.

           

          The drive clutch adjustment affects the PTO clutch adjustment so the drive clutch should be done first.

           

          There is a more involved adjustment that is done on the clutch itself to make sure all of the clutch fingers are pressing equally. That adjustment does not change with wear and should not need to be changed if it was set properly when the clutch was installed.The finger adjustment can also be used to adjust for wear but I find it simpler to adjust from the outside.

        • September 12, 2012 at 9:42 pm #35073
          quicksandfarmer
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            If you don't have a helper to press on the clutch, I've found that a come-along on the pedal attached to something sturdy is good for holding the pedal down. Nothing else I could think of holds it securely all the way down.

          • September 13, 2012 at 6:34 am #35074
            Pinetr5000
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              Thank you quicksandfarmer, your write-up is very helpful to many of us.   I plan to make the clutch adjustments this weekend.

              Pinetr5000

            • September 14, 2012 at 6:02 am #35080
              bg
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                Quicksand,  Thank you for the excellent advice. I've been putting off my clutch adjustment for awhile and this is really helpful. BG

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