637 Airweight problems

[crabshack]

Picked up a used like new 637 Airweight for dirt cheap, never heard of this issue. Trigger is not bad, timing is good but after 6-7 rounds of factory 158gr standard pressure round nose in DOUBLE action the cylinder will index to the next round but the hammer would not move at all for a few trigger pulls.

Gun can be cocked and fired single action. And it dry fires just fine double action or single.

 

[Babysitr]

Sounds to me like a call to S&W, and possibly a return box is in order ?

 

[s&wchad]

If I really try, I can get most S&W revolvers to cycle the cylinder without cocking the hammer. I do it by not allowing the trigger to fully reset.

It's possible that the action is gummed up and the trigger isn't moving fully forward and it's possible that a previous owner messed with the springs, but it's also possible that you're not fully releasing the trigger. Try shooting the gun again and make a conscious effort to completely get off the trigger after each shot.

 

[crabshack]

I also own and shoot a Ruger LCR and a Smith Bodyguard so trigger reset is not the issue.

 

[crabshack]

[ame]https://www.youtube.com/watch?v=iryIq0pF58w&feature=youtu.be[/ame]

 

[Rick_A]

I had a S&W with a light rebound spring that I would inadvertently short stroke on occassion. Felt like a mechanical problem. It took a while to pin down. It's certainly a possibility.

Neither of the additional guns mentioned are an Airweight, so their acknowledgment is irrelevant.

As mentioned, a sluggish action can also be attributed to a gun that has been stored a while. It doesn't take much.

Before sending it in I would heed the previous advice.

 

[BC38]

s&wchad has likely diagnosed the problem - sticky innards.
Try removing the sideplate to cleanit out, or if you're not comfortable with doing this (or lack the proper screwdrivers) try flushing it out with an aerosol cleaner like Gun Scrubber and then a light squirt of quality lube like Remoil into the action through the hammer and trigger openings.
Sure would be worth a try before doing anything more drastic.

 

[ken158]

Light spring or maybe hammer or trigger stud is broken. Happens frequently on air weights.

 

[kaaskop49]

attn OP

Sounds similar to what I've experienced in some modern J-frames. Make sure the sideplate screws are tight. Not 'death-grip' tight, but secure. I've found these screws may loosen when firing, resulting in the cylinder revolving when the trigger is pulled, but the hammer remains in the rest position.

Kaaskop49
Shield #5103

 

[michpatriot]

When you had the sideplate off did you remove the hammer? The reason I ask is that if it has a sheared hammer pivot it could explain the problem..they will sometimes operate but sporadically act up until they quit, you see the sideplate supports the hammer pivot pin on the end and if it's sheared from the frame side it may not be obvious unless you remove the hammer and look...