Taipan Veteran I failure to fire

Hello,
I am a gunsmith and had a customer bring me a Taipan Veteran I. It has 200 Bar pressure but will not fire. The trigger moves as it should and I opened the side and all the sears hammers and springs appear to be in the correct place and not broken. If the side handle is supposed to cock the gun it does not. If I manually cock the gun and pull the trigger it still does not fire.

Another question what does the green dot next to the pressure knob mean and what is the indicator for the pressure knob (up down sideways)?

Are there any reference pubs other than the owners manual that is extremely vague.

Thanks.
 
If the gun is not cocking, it’s usually one of two options 1 - it’s already cocked and if you pull trigger it will fire. I’m assuming it’s the second option, the hammer spring adjustment is too tight. Loosen it turning counter clockwise a half turn. Then attempt to cock the gun and shoot. If that fails to fix it. The only other reason is the trigger linkage is not adjusted correctly. See if the safety engages properly and the trigger pulls with a nice crisp click. Anytime one of mine failed it was always one of these 3 reasons.
 
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If the gun is not cocking, it’s usually one of two options 1 - it’s already cocked and if you pull trigger it will fire. I’m assuming it’s the second option, the hammer spring adjustment is too tight. Loosen it turning counter clockwise a half turn. Then attempt to cock the gun and shoot. If that fails to fix it. The only other reason is the trigger linkage is not adjusted correctly. See if the safety engages properly and the trigger pulls with a nice crisp click. Anytime one of mine failed it was always one of these 3 reasons.
Thank you. What actually cocks the rifle? I assume it’s the silver side handle. Is that correct?
 
Thank you. What actually cocks the rifle? I assume it’s the silver side handle. Is that correct?

Sorry for being stern, but how do you know a rifle is broken, if you don’t know how to use it?
Maybe watch some videos, or meet up with someone who actually knows what they’re doing. It’s dangerous not to.
Ok great where are “some videos” that’s why I’m on this thread.
 
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Ok great where are “some videos” that’s why I’m on this thread.
Google is your friend.

And you thread began by saying your gun was broken. Nothing about you not knowing how it operates. It’s not rocket science, but it is VITAL you know what you’re doing for your safety and everyone else’s.
 
A lot of airguns get quirky if the trigger is adjusted too light. Things may APPEAR to be correct, as you stated with sear assembly but won't allow cocking lever to engage & reset for next shot. Just a thought. I've never worked on a Taipan but this is true for some airguns in general. Get yourself & learn about pcp airguns. You'd probably generate more income if you're "airgun able" & can do GOOD repair. Be careful with the high pressure!
 
@Ironworksarmory - Welcome to AGN and the PCP rabbit hole. PCP's are pretty easy to work on once you degass them and verify the rifle is unloaded and on safe. Youtube is your friend, lot's of good videos out there.

The Taipan Veteran has a bullet proof reputation. I have had mine for five years with no issues. This guy installed a Huma regulator upgrade on his Veteran. It is a great instructional video that should answer a lot of your questions.

Hope it helps!

 
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Most likely the hammer spring is screwed in too far causing hammer spring bind. It is a short and heavy spring so not a lot of adjustment needed to change velocity. Once that is backed out and checked, then sear engagement would be next. With all the adjustments on the Taipan trigger group it is not hard to adjust it too light to the point the sear does not engage.