New 629 cylinder frequent fails to rotate

[rbkeiser]

Most of what I've found searching threads refers to lock up timing and that is not my problem with this new revolver. What happens is the hand doesn't always push the star along at initiation of trigger pull. When this happens, cocking the hammer usually will. Sometimes the reverse happens and the cylinder doesn't begin to advance by cocking the hammer. In that case trigger cocking usually does. I've inspected for dirt etc and there isn't any.
Also, "shaking" the gun will usually cause the cylinder to rotate. my guess is the hand-star relationship is barely in-spec or else there may be a tiny amount of interference between the hand and the hand window but am reluctant to try and correct as I have no training or experience. The gun is in warranty, obviously, so I can send it in for repair but I just got it this week! (Sigh.)

Ideas?

Thanks,
Blake

 

[500 Magnum Nut]

Most likely the hand spring fell out. Only removing the side plate will prove it. In the faq there are pictures to aid you in putting it back inside the trigger.

Or the hand alignment is totally mis-aligned, because the hand window is too wide etc (defect).

Check the sing in the faq...

 

[Dragon88]

Since the revolver is under warranty, and you admit you have no experience or knowledge working on Smiths, I would send this one back to the factory for service. S&W will pay shipping both ways and you should have your gun back in a week or two. Popping the side plate is not extremely difficult, but there are lots of places to screw up without the right tools and know-how. Also once you get inside, there's a lot going on in there. It can be overwhelming to the untrained eye.

 

[rbkeiser]

Thanks to both of you. The hand spring is in place although it seems very light. (I have no reference for this, though.) Interestingly, backing off the strain screw on the mainspring seems to have dramatically mitigated (but perhaps not properly) the problem. just completed 100 trigger cocks w/o failure. I will likely call S&W in the morning but had planned to give this gun to my son for Christmas and am afraid I won't get it back by then.

Blake

 

[rbkeiser]

Ok. Here is the found problem... "No right sing."

Check Sing

In a panic situation, the hand could skip by a ratchet, and the gun won't fire.

Press trigger back enough to clear the cylinder stop, then spin cylinder. Listen for the hand clicking on the ratchets.

Press back and left = Left sing
Press back and right = Right sing
Press back straight = Neutral sing

If your right handed you normally pull the trigger to the right.

If no right sing: Bend hand over to right side of the window. To do this simply insert screwdriver underneath the hand and lift upward.

Can someone elaborate on this fix? I can't tell where to insert a screwdriver or what to "bend." (Frankly, I don't see this as possible but what do I know.)

 

[Dragon88]

Sorry bud, you really need to send this one in to S&W and stop tinkering. Google searching potential problems and trying to bend things on your gun will only cause you heartache and possibly a voided warranty.

Do not kitchen counter gunsmith this one. Call S&W in the morning and ask for an emailed pickup tag.

 

[500 Magnum Nut]

The hand pin (that the spring is attached to) is bent in such a way it forces the hand to ride the slot differently. Right sing- bending of the pin is done while the parts are in the gun, lift up on the hand pin with screw driver.

But if you must bend the pin down, the trigger needs to be pulled in order to do it, which fixes "left sing".


When people switch hands shooting these guns they will pull the trigger differently. That's why you lean on the trigger on the right or on the left to test the alignment.

This alignment is referred to as sing.

Revolvers like most guns are tweaked here and there for opium performance.

And I agree with the other guy, It's a new gun let S&W fix it, if your not sure of yourself. If adjustments are done wrong, it will go south quickly.

 

[rbkeiser]

Fixed! Thanks Jerry Miculek.

 

[500 Magnum Nut]

Now I'm curious. What was wrong with it?