Author Topic: Dragonfly gear selectors  (Read 368 times)

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Offline davrhos

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Dragonfly gear selectors
« on: 20 Dec 2019 at 18:16 »
Does anyone have a source for replacement or refurbished gearbox selector forks for Dragonfly. Any suggestions welcome.
Thanks and Merry Christmas to all,  Dave

Offline eddie

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Re: Dragonfly gear selectors
« Reply #1 on: 21 Dec 2019 at 08:41 »
Dave,
          Are your selectors just worn in general, or are you having problems with selecting just one particular gear? There are some dodges to overcome some of the problems!

  Regards,
                 Eddie.

Offline davrhos

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Re: Dragonfly gear selectors
« Reply #2 on: 21 Dec 2019 at 15:26 »
Hi Eddie,
       Selectors are worn to varying degrees, but operate O.K. in 1,2,& 3,but fail to select fully in 4th. gear. Will engage a fraction, but won't  hold under power.  Holding the gear lever down iwith my foot and the cogs engage further and hold O.K.  Fraction of play in all of the surfaces which engage the gears
but wouldn't call it excessive.   
Regards, Dave

Offline eddie

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Re: Dragonfly gear selectors
« Reply #3 on: 21 Dec 2019 at 17:04 »
Dave,
          Poor engagement of top gear seems to be quite common on Dragonflies (especially late ones). The engagement of top can be improved by shimming the input shaft backwards. This involves removing the cover plate that houses the front bearings for the main shaft and layshaft. You need to remove the 4 screws in the plate that retains the input shaft. Withdraw the input shaft and loose rollers. Heat the alloy plate to aid removal of the outer bearing track and the facing plate. Make a shim washer about 1mm thick to go behind the facing plate. Replace the facing plate and outer track. This will now stand proud of it's housing by the 1mm. Make another shim of the same 1mm material the same shape as the retaining plate, and with a hole large enough to fit over the protruding outer track. Refit the main shaft, bearing rollers and retaining plate. Top gear will now engage 1mm deeper without adversely affecting the depth of engagement of third gear.
    Hope this helps,
                               Regards,
                                                Eddie.

Offline davrhos

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Re: Dragonfly gear selectors
« Reply #4 on: 22 Dec 2019 at 14:05 »
Hi Eddie,
Thanks for the advice, will give it a try.

Cheers, Dave

 

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