Issues with new Pietta.

[David Dalton]

I have a brand new Colt Navy Pietta with an issue I can't diagnose. If the hammer is eased down from full cock on a nipple it will catch on something as it is being cocked. The hammer barely moves before it catches. If the hammer is lowered again from where it catches it will lock normally. If the hammer is lowered with more authority it does not catch. Not sure if it is something with the hammer or hand maybe. Ideas? Thanks for any input.

 

[David Dalton]

I have a brand new Colt Navy Pietta with an issue I can't diagnose. If the hammer is eased down from full cock on a nipple it will catch on something as it is being cocked. The hammer barely moves before it catches. If the hammer is lowered again from where it catches it will lock normally. If the hammer is lowered with more authority it does not catch. Not sure if it is something with the hammer or hand maybe. Ideas? Thanks for any input.

I just wanted to add that I have disassembled and checked for burrs.

 

[45D]

I have a brand new Colt Navy Pietta with an issue I can't diagnose. If the hammer is eased down from full cock on a nipple it will catch on something as it is being cocked. The hammer barely moves before it catches. If the hammer is lowered again from where it catches it will lock normally. If the hammer is lowered with more authority it does not catch. Not sure if it is something with the hammer or hand maybe. Ideas? Thanks for any input.

I'm guessing you mean it catches on something when it's being "lowered" ( instead of "cocked"). If that's the case, it's the left bolt arm hitting a "too proud" cam. The reset angle cut to allow the cam to push the arm aside is probably insufficient. Those are the kind of things that heavy mainsprings cover up.

Mike

 

[M. De Land]

I have a brand new Colt Navy Pietta with an issue I can't diagnose. If the hammer is eased down from full cock on a nipple it will catch on something as it is being cocked. The hammer barely moves before it catches. If the hammer is lowered again from where it catches it will lock normally. If the hammer is lowered with more authority it does not catch. Not sure if it is something with the hammer or hand maybe. Ideas? Thanks for any input.

I'd check the chimney (hand mortise in frame) hand or ratchet star for any burrs or nicks that are catching also.

 

[russellshaffer]

I think the cnc machining is what leaves sharp edges in all of the cuts. I smoothed everything with a small diamond file including the hammer slot. It's noticeably smoother now. Mine is a 2023 model. I didn't really remove any metal to speak of. Just took off the sharp edges. Take the barrel and cylinder off and it's easier to feel and see whats happening.

 

[David Dalton]

I am thinking that 45D is correct. When I slowly lower the hammer, I can feel it rub about where it feels like the bolt ears would engage the cam. What would be the fix? I appreciate the responses.

 

[45D]

I am thinking that 45D is correct. When I slowly lower the hammer, I can feel it rub about where it feels like the bolt ears would engage the cam. What would be the fix? I appreciate the responses.

Blend the bottom of the cam flush with the hammer. That will remove the lip that the bolt arm is catching on.

Mike

 

[M. De Land]

Blend the bottom of the cam flush with the hammer. That will remove the lip that the bolt arm is catching on.
View attachment 315143

Mike

This is a new one made and installed last year with the taper flushed out to the body. It's made of 0-1 tool steel red loc-tited into a well fitting hole purchase.

 

[David Dalton]

I blended the cam in a tiny amount and problem solved. I truly appreciate the help.

 

[Smokerr]

That is fantastic to hear