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Tentative Stripdown For First Timer, Hw99s

Discussion in 'Technical' started by GrahamC, Jun 29, 2020.

  1. GrahamC

    GrahamC Active Member

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    My first air rifle and first strip down to fit a tbt drop in kit and generally familiarise myself with the thing. This is a rifle I purchased new quite recently and has had maybe 40-50 pellets fired through it.

    Should the trigger assembly look like this, with the black tab on one corner angled like that?

    Are all springs so roughly cut and 'finished'?

    Any comments/concerns on what you see in the pictures?

    I am not going to trust myself at this point to open up the trigger mechanism!

    Thanks Graham
     

    Attached Files:

  2. johnnyv

    johnnyv Busy Member

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    Trigger is fine

    Make sure the articulated cocking link is free to articulate by working repeatedly whilst lubed through its full working arc, some people bash the joint to free off if needed

    Knock that pin out of the arm for the delrin slip pad and remove the strong b****r of a spring under it so it can free float

    Clean up slot and cocking foot end of lever and dress the spring end flat degrease everything then lube from afresh

    I've just done a HW 50 essentially the same rifle with an excellent Welsh Willy kit which also includes a steel piston liner now shooting lovely
     
    2506sendero, GrahamC and foxtrott like this.
  3. Storcky

    Storcky Busy Member

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    Oh my it looks like someone has been in there before and it all needs a proper going over.
    I would Google the trigger assemble and look if that tab has been moved.
    As for the rest a proper clean and relube.
    The spring you can polish using wet and dry on a flat surface.
    Someone will be along soon with more knowledge of this gun than I have and put you right.
     
  4. GrahamC

    GrahamC Active Member

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    Thanks Johnny, gave the pin on the knuckle a 'tap' from each side and freed up nicely :up:
    Pin (semi) removed from delrin strip and spring removed, damn that is a strong little spring! Might opt for the biro spring option mentioned elsewhere.
    I've wet-n-dried the cocking foot and it looks quite smooth.
    Any particular lube preference for the cocking arm delrin strip?
     
  5. GrahamC

    GrahamC Active Member

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    I hope no-one has been in there before as it's a new gun.
     
  6. Storcky

    Storcky Busy Member

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    Wow luck of the draw with that one then :eek:
     
  7. Gat Man

    Gat Man Busy Member

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    Piston seal looks a little chewed up around it's circumference at one or two places

    I'd be replacing that for sure with either another HW one or an Aussie version if you can wait

    Careful easing it past the 4 square cutouts in the cylinder when you put it back together!

    Zooming in on photo number 6 looks like the galling tram lines are evident :eek: but it could just be the photo?

    Screenshot_20200629-194233_Chrome.jpg
     
  8. mikeyhall1

    mikeyhall1 Amazing Poster

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    No it all looks factory standard to me, trigger is absolutely normal.
     
    Blackmax and GrahamC like this.
  9. stew87

    stew87 Certified

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    Yes thats a normal spring :facepalm: bit of wet and dry will see it smoothed off a bit trigger is normal if it feels ok leave it be for now they can be little b*****s to get back together the rekord units. light grease on the piston seal nothing on the face and a smear of grease on the spring and remove that spring from the link and you will be good to go :thumb:
     
    GrahamC likes this.
  10. GrahamC

    GrahamC Active Member

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    Thanks guys for the reassurance and advice, appreciated :up:
     
  11. 2506sendero

    2506sendero Legend in his own mind & living on the edge.

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    Be careful not to lose the small (usually silver coloured) threaded retaining washer that slots into the trigger mech - ask me how I know ;)
     
  12. 2506sendero

    2506sendero Legend in his own mind & living on the edge.

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    Good video here :-

     
    Vince68 likes this.
  13. GrahamC

    GrahamC Active Member

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    That was the grease, once cleaned the seal looks good. I've seen positive comments on the Aussie seals.

    I'll be sure to ease it back in carefully, thanks.

    I think its a reflection in the photo, once the gunk was cleaned off there's no sign of any tram lines.
     
    Gat Man likes this.
  14. StellaArtois Sr

    StellaArtois Sr Springer Whore

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    Apart from too much grease on everything it all looks as it should be, when you open a HW99 up.
    I always remove any sharp edges on the springs then polish the ends up like chrome. Most manufactures
    produce springs like that, I have yet to see one that isn't like it.
    With the slots in the piston, I just fitted a Vortec unit in my HW98 and I actually used a Dremel to lightly
    smooth the edges out, it has made it very smooth to cock.
    As for the trigger that looks normal, just degrease it then add a little bit of moly grease to the sears you can see,
    and adjust it to your liking.
    As with most Springer air rifles you just need to finish them off properly.
    Ade :thumb:
     
    GrahamC likes this.
  15. GrahamC

    GrahamC Active Member

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    Haha, yes knew about that one, it did still fall onto the bench though. Also kept a finger over the safety, but ended up having to pull (ease) it out!
     
    2506sendero likes this.
  16. landymick

    landymick Big Poster

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    Trigger unit is fine , if you didn’t know already the tab in front of the trigger blade is used to alter the travel of the first stage.
     
    GrahamC likes this.
  17. Tinbum

    Tinbum Delusions of adequacy

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    I just answered your pm, I haven't seen the email, text or carrier pigeon yet!:D
     
    GrahamC likes this.
  18. GrahamC

    GrahamC Active Member

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    Replied :up:
     
  19. johnnyv

    johnnyv Busy Member

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    Good moly or bumslide will do all that's needed on the lube front regards sliding bits
    Good drop of oil on cocking pins and breech bolt and all should be good:up:
     
    GrahamC likes this.
  20. Dag

    Dag Pro Poster

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    It's worth checking the interior edges to see if there are any burrs that could damage the piston seal whilst re-assembling.
    Also file off the edges of the lugs that secore the trigger block so that they are easily removed next time. If loose thay can be held in position with a little dab of grease. I only fit two and make sure these are fited diagonally opposite each other which allows for easy removal next time you take it apart.
    I find all HW springs are a disgrace and it's worth taking the time to either flatten the ends if required and/or , as suggested already, dressing them smooth.
    Jim
     

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