Big Nikko Help

Discussion in 'General Airgun Chat' started by palmanda, Nov 24, 2018.

  1. palmanda

    palmanda Member

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    I have a Mk2 Big Nikko and the sidewheel is very tight, towards the higher end distances it feels like it’s almost grinding

    Have any of you Guru’s pulled one of these apart?

    Any advise would be appreciated
     
    Last edited: Nov 24, 2018
  2. Ratinator

    Ratinator 77.74

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    You’ll probably find it’s the o ring binding .
    Remove the side wheel then the hub that’s about 42mm then you will see the o ring .
    If it’s in one piece try a little silicone grease , it may require a bit of wet and dry around the inside of the hub if it’s catching .
     
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  3. palmanda

    palmanda Member

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    I have the screw out and the round disc. I’m now looking at a second disc with two small holes which appear to be for a tool to rotate it?

    How does the hub come off?
     
  4. Ratinator

    Ratinator 77.74

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    Is it brass in colour if so don’t undo it
     
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  5. Ratinator

    Ratinator 77.74

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    Your problem should be with the black hub , if it’s not that it will need looking at by a guru or manufacturer .
     
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  6. palmanda

    palmanda Member

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    5B07B115-F6B3-45DC-85A2-705C1CA2C27D.jpeg That’s what I’m looking at
     
  7. SteveC200

    SteveC200 Active Member

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    Use circlip pliers if you have some or a couple of tight fitting allen keys to undo it. I have a feeling its a left hand thread but you'll be able to tell, it shouldnt take much effort to unscrew it.
     
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  8. mjoh

    mjoh Member

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    I have the screw out and the round disc. I’m now looking at a second disc with two small holes which appear to be for a tool to rotate it?

    Paul
    I did this on my MK 2 Nikko. The disc with 2 holes needs a tool - I made one fron 2 nails in a piece of wood at the correct spacing - bit fiddly to get right but it worked for me. The thread on a MK 2 as I recall is a LEFT hand thread - so clockwise to undo. There is another o ring inside which I removed completely but it may just need some silicone grease on it. If removed the wheel will have some "wobble" but it cured my issue as long as you range in same direction for the final reading it wont matter.
     
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  9. palmanda

    palmanda Member

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    All sorted now thanks chaps
     
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  10. SteveC200

    SteveC200 Active Member

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    Thread bump. :)

    I have to do similar with my Mk1 Nikko. Once the sidewheel is off, how does the cover with the logo on it come off? The scope is mint so I dont want to lever it off and risk damage if I can help it and I'm pretty sure it doesnt unscrew. Any suggestions?
     
  11. Conor

    Conor Never been banned from sales Staff Member

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    The logo is stuck on so it needs to be removed. Under that is a brass flat head locking screw.
    Then the threaded disc need to to bee loosened off, need to make yourself a little tool for the job, it’s opposite thread also.
     
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  12. SteveC200

    SteveC200 Active Member

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    Thanks, it's getting the logo disc off without damaging it or the knob thats the tricky bit. It's a damn snug fit. I'm soaking it in silicon oil at the moment hoping it'll ease up the O rings but I have a feeling the threaded disc is nipped a tad too tight.
     
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  13. gdavison

    gdavison Active Member

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    To add to this thread/info for future use by all Big Nikko owners looking to remove the side wheel, the Mk3 is a simple job, involving undoing 3 grub screws and simply lifting off the side wheel knob (similar to removing the turret covers). Looks like Nikko Sterling made it easier for MK3 owners. Downside is you can get the problem where the 3 grub screws come loose and you side wheel starts to simple rotate round and round without changing parallax, which is what happened to me. As part of my regular maintenance I check the 3 grub screws which you can just get to with a Rowan side wheel
     
  14. DeanB

    DeanB Active Member

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    Thanks for that - another one for the excuse book.
    Seriously, thanks for the info.
     
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  15. Adam

    Adam Well-Known Member

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    Remember as Conor said it's a reverse thread
     
  16. SteveC200

    SteveC200 Active Member

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    Will do, thanks. Presumably youve done this job? How did you get the logo badge off without damaging it? Thats the only bit I'm stuck on.
     
  17. Ratinator

    Ratinator 77.74

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    The logo will be held by either , double sided tape or a spot of super glue.
    Warm with a hairdryer first and use a thin butter knife to ease it up .
     
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  18. Adam

    Adam Well-Known Member

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    Can’t really remember sorry. I think I just prised it off as carefully as I could.
     
  19. SteveC200

    SteveC200 Active Member

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    That was scary but got it sorted. What I presume what was once grease was now crusty flaky stuff. Cleaned all that off, regressed it, all good. Thanks for your help chaps.

    By the way, it gets asked now and then, the skinny O ring that seals the small parallax knob is 34x1.25mm.
     
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  20. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    I think most of the problems I see with both PCP’s and scopes are o ring related and usually because the o ring isn’t lubed in any way on fitting so quickly starts scuffing and then finally breaking down.
    It’s always a good idea to lightly lube any o ring you’re replacing with some quality silicone grease.
    Less is more, you just need to work into the ring with your fingers before fitting making sure all sides are evenly coated...
     
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