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 Post subject: HDD on the at44
PostPosted: Mon Jul 28, 2014 12:53 pm 
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Joined: Sun Jan 09, 2011 8:07 am
Posts: 3320
Location: Central West River Nova Scotia
As I understand it, the liittle tuning fork in the at44 is a hammer debouncer. Anybody know if it actually works ? My at44 sounds like theres a hammer bounce at low pressure. Around 1200 psi. Besides the sound how do you know if theres hammer bounce. At low pressure I find it hard to tell on the manometer if im using too much air per shot.

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 Post subject: Re: HDD on the at44
PostPosted: Mon Jul 28, 2014 3:00 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
To test it Joe, remove your air tube, take a dowel or rod and see if you can push the hammer back when in the fired position. If the hammer does not move more than the3/8" or so should be working.
If the fork is rounded over then it could bounce. Also check the fork spring that is in good condition and not binding.

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 Post subject: Re: HDD on the at44
PostPosted: Mon Jul 28, 2014 3:12 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6016
Location: P.G. B.C.
TKs for the explanation, Walter. The tuning fork look-a-like de-bouncer, on my BT65 - broke when the gun was less than 2 weeks old and the pieces were easily removed - the short piece fell out, when I inverted the rifle and the other, longer piece fell off the action (I assume) when I removed the barreled action from the stock. I've never missed having it on the rifle - ever and the rifle works perfectly without it. Had Joe not brought this up, I'd not have remembered about that piece of seemingly useless paraphernalia.

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 Post subject: Re: HDD on the at44
PostPosted: Mon Jul 28, 2014 4:50 pm 
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Location: Central West River Nova Scotia
Voltar1 wrote:
To test it Joe, remove your air tube, take a dowel or rod and see if you can push the hammer back when in the fired position. If the hammer does not move more than the3/8" or so should be working.
If the fork is rounded over then it could bounce. Also check the fork spring that is in good condition and not binding.

Thanks walter. I'll check.

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 Post subject: Re: HDD on the at44
PostPosted: Mon Jul 28, 2014 5:43 pm 
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Joined: Sun Jan 09, 2011 8:07 am
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Location: Central West River Nova Scotia
I did as Walter suggested with both guns. As he said, one gun the hammer moved about 3/8". on the other, pushing on the hammer actually cocked the gun. Upon inspection I found the little spring had looped down over the end of the debouncer fork, s tail, and was preventing it from coming up all the way to catch the hammer. All fixed now. Thanks again Walter.

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