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HW 35 Wont cock

Discussion in 'Anything Airgun Related' started by mrhanky, May 18, 2015.

  1. mrhanky

    mrhanky Engaging Member

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    So recently I have stripped my Hw 35 for a bit of a service and put one of Tinbums tuning kits in! (you may have seen previous posts)

    Anyway the gun now wont cock.....cocking action is smooth as it should be and the piston reaches the trigger unit but it does not engage......if I cock the gun and then press on the sear with a large flat head screwdriver (I think its called the sear) it clicks down and remains cocked and fires ok. I have played with trigger adjustment but I can seem to get it to cock!


    Anyone got any ideas of what my problem could be???

    Thanks
     
  2. T 20

    T 20 Busy Member

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    I'm over here, Dave
    It could be that the spring is getting coil bound just before the point of trigger engagement.

    If you've put slip washers in, try taking them out or if you've fitted no slip washers try removing the top hat to gain more spring room.

    If you need any more advice you could always ring Nick (Tinbum) as he has a well documented love of the HW35. :D



    all the best Mick
     
  3. Blackmax

    Blackmax Forum Rude Guy

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    I had a similar issue recently with an HW80 I fitted a Tinbum kit to, thanks to Nick's great after sales we worked through the potential causes and resolved it.

    Firstly make sure the length of the spring guide and top hat combined when placed on the piston don't protrude from the end, if they do cut the spring guide down slightly until both fit within the piston.

    I read the reply from another poster about being spring bound which is the second option, in other words the spring compressed is too large for the piston not allowing the piston rod to engage in the trigger.

    Thirdly and most likely is the issue I had with the HW80 and that's the spring guide base being too thick; firstly make sure that no power washers are fitted as the other poster said. The HW80 had been subjected to modification as per 'Power Without Powder' and the piston rod shortened to lengthen the stroke. Making the piston rod shorter meant the non standard spring guide I removed had the metal base machined down to 1.8 mm to allow the trigger sear to engage.

    To resolve this issue you need to reduce the spring guide base thickness, I did this with a sander. By oscillating the spring guide you will be able to take the out edge thickness down with the sander without making the inner where it meets the hollow rod the spring sits on. This allows the piston to get closer to the trigger unit, thus allowing it to engage.

    Just as an afterthought you did set the trigger before placing it in the block and then once in it you released it?
     
  4. mrhanky

    mrhanky Engaging Member

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    Yes Nick has been very helpful cant fault him at all...just haven had the time to call him yet!

    Hmm your third point has me thinking because the piston has been modified!
     
  5. Rincewind666

    Rincewind666 Moderated user

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    It's the trigger I bet. I'm an air gun tuner and half of my jobs are trigger re assembly problems.
     
  6. Blackmax

    Blackmax Forum Rude Guy

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    Shame your the other end of the country or I'd offer to help you sort it out.
     
    Last edited: May 19, 2015
  7. Tinbum

    Tinbum Delusions of adequacy

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    Who? What? Where? Regarding spring bind, count the number of coils and multiply by wire diameter, then check against spring room in the piston. That was an 80 spring I sent, so could well be the issue.

    Ring me when you're free, BUT NOT DURING EUROVISION!!!:eek::eek:
     
  8. mrhanky

    mrhanky Engaging Member

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    Top I will get the calliper gauge on it...thanks for the help fellas!
     
  9. Blackmax

    Blackmax Forum Rude Guy

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    Did you get this issue resolved?
     
  10. mrhanky

    mrhanky Engaging Member

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    Havent had time to look at it yet mate. I will report back as soon as I have.
     

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