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  Graham Taylor July 20, 2017 at 9:30pm

  There's a "woodruff key" (small semicircular piece of steel) that locates in the end of the roller shaft  and  slots into the end piece................ if this has fallen out, you'll have this problem.  The slot in the shaft that the key sits in, can also wear so the  key isn't locked securely in place.    Basically, you'll  need to remove the shaft and  check the key is there and located correctly..... if it is, check the key is a tight fit in the slot. 
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    David Sutton > Graham Taylor July 20, 2017 at 9:39pm

    Hi Graham,

    I bet that's the issue. I wouldn't have believed that such a small component one end could impact on the other. I've ordered one and will strip it at the weekend and see if you were correct.

    Appreciate your help,

    Thanks

    David
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      Graham Taylor > David Sutton July 20, 2017 at 10:22pm

      agree there....................seems a bit of a design fault that so much relies on that tiny "key"             On mine, I had to replace the shaft as the key slot had worn badly so the key wasn't a tight fit in it..
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        David Sutton > Graham Taylor July 31, 2017 at 7:43am

        Thanks Graham,

        You were bang on. Key inserted and all runs true now.

        Appreciate your help.

        David
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  John Powley July 21, 2017 at 10:13am

  Definitely the missing key, I'm pretty sure when we drop these bits they just run off and hide under something.
  I've spent hours crawling round doing looking for things.
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    David Sutton > John Powley July 31, 2017 at 7:44am

    Thanks John,

    Inserted a replacement key yesterday and all running perfect now.

    Thanks for responding.

    David
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  Dan Frazer Gardening July 31, 2017 at 11:07am

  Is there much complex to overhauling the roller? I really want to do mine this winter and I've tried in the past but only got so far and failed to get everything apart. I've now got circlip pliers and hopefully everything else that might be needed.

  I wish there was a decent youtube video of how to do it!
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    John Powley > Dan Frazer Gardening July 31, 2017 at 4:08pm

    Not really but then I cut my teeth working on mowers 25 years ago so have done my fair share.
    
    The hardest part as you say is getting it apart, it will fight you every step of the way.
    Emery tape the shafts before starting to disassemble, this will help a little to get it apart, the fun is how much of it is in bad shape, catch the roller bearings early and you will save the roller shaft from wear, don't and you'll be replacing a lot.
    
    Most common is bearings, this causes the splined shaft and roller to wear, then the selector fork and pinion can wear.
    
    Not keeping the cable adjusted can cause premature wear.
    
    Im in Cheshire if you want help if you are local.
    • PRO

      Nigel Gillam > John Powley January 24, 2020 at 7:50pm

      Hi John,

      I have got a couple of this mowers and was wondering can they go any faster? as the cut the best but so slow compared to Hayter lawnmowers.

      Do please let me know if there is any way to improve the speed of these machines.

       

      Cheers Nigel 
      • PRO

        Gary RK > Nigel Gillam January 24, 2020 at 8:31pm

        Get a cheap digital tacho from eBay/Amazon and tweak engine to near it peak power curve according to the handbook is the first thing I would do.

        Dont exceed, otherwise you’ll reduce engine life, create more vibes and noise.

        Ensure you have a high-lift blade fitted ( not much to do with speed, but increases efficiency )

        When you replace the mowers make sure you choose the new high(er) speed versions.

        Search LJN and you’ll find many a thread about this....