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TSO Hammer Won't Fall After Cleaning


pfiedler
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Just finished a cleaning on my TSO. The trigger was in the cocked and locked position when I reinstalled the slide and pin. Now, when I pull the trigger, the hammer won't fall. I tried racking the slide, inserting an empty magazine, racking the slide with no magazine and nothing is working. Took the slide off and repeated the procedure...still no luck. Gun worked perfectly before the cleaning. The safety can be moved to the "safe" position (up) but when returned to the firing position, still the hammer won't drop.

If anybody has an idea what's going on here, it would be greatly appreciated.

Thank you very much in advance!

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11 hours ago, ck1 said:

Almost sounds like your over-travel screw in the trigger may have moved..?

When you say “clean” do you mean just a field strip, or a detail strip?

Thanks for the help!

I only field strip cleaned the gun. Did not take it all the way down.

I always cock the trigger when I'm field stripping the pistol. Then I release the hammer slowly once broken down. It's when I went to cock the trigger to test the action that this problem arose. First time.

I will check the trigger over-travel screw, but I've had no issues with that to date. Fairly new pistol...may 600 rounds through it.

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9 hours ago, yigal said:

did u break up the sear cage /safety ?

probably sear edge  stuck under  hammer hook.

 

I did not break up the sear cage/safety. Do you think I should take the sear package all the way down and rebuild? Perhaps something got misaligned but I can't see why. I've field stripped the gun many times for cleaning and never had this happen.

Thank you for the suggestions yigal.

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I’d try backing out the over-travel screw... if it’s not that, then it’s a perfect time to learn how to detail strip it lol 😂 

You don’t have to take it all the way down honestly, but taking out the safeties and sear cage will let you make sure everything is in order 🤙

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1 hour ago, pfiedler said:

I did not break up the sear cage/safety. Do you think I should take the sear package all the way down and rebuild? Perhaps something got misaligned but I can't see why. I've field stripped the gun many times for cleaning and never had this happen.

Thank you for the suggestions yigal.

if u didn't take apart safety it's not the case  but,if sear is under hammer u need to take apart.

As you do this, make sure the sear cage  is pressed back against the 2 springs and sear seat on his place on the hammer 

like this. during safety installation sear cage can move and  sear can slip under the hammer.

Image result for cz sear hammer engage

Edited by yigal
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FYI/FWIW: If it ends up being the over-travel screw (or really even if it isn't), I'd say this: There are really only 2 ways you can prevent that little screw from biting you in the ass sooner or later and eventually ruining a match day... either (1) decide you don't care about a little extra over-travel and remove it and throw it in a trash can, or (2) Red Loctite it, adjust it correctly, and forget about it (resigning yourself to the fact that you'll need to put a soldering iron on it for a minute or two if you ever want to adjust it or remove it in the future)...

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5 hours ago, yigal said:

if u didn't take apart safety it's not the case  but,if sear is under hammer u need to take apart.

As you do this, make sure the sear cage  is pressed back against the 2 springs and sear seat on his place on the hammer 

like this. during safety installation sear cage can move and  sear can slip under the hammer.

Image result for cz sear hammer engage

Just got back from a shooting match (.22cal precision pistol). I'm about to venture back into the guts of my TSO. What you suggest above just might be what happened. Thank you for the suggestion and I will certainly check it out. Wish me luck!

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3 hours ago, ck1 said:

FYI/FWIW: If it ends up being the over-travel screw (or really even if it isn't), I'd say this: There are really only 2 ways you can prevent that little screw from biting you in the ass sooner or later and eventually ruining a match day... either (1) decide you don't care about a little extra over-travel and remove it and throw it in a trash can, or (2) Red Loctite it, adjust it correctly, and forget about it (resigning yourself to the fact that you'll need to put a soldering iron on it for a minute or two if you ever want to adjust it or remove it in the future)...

Good idea! What I've been reading in the last 24 hours or so is that the over-travel screw can be problematic. I will certainly keep that in mind.

Thanks very much for the suggestion!

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10 minutes ago, Lior said:

One of the nice things about the TS / CzechMate compared to the Shadows is that with its plastic trigger, one is never worried about the overtravel screw conspiring with the frame to ruin your match!

😀

yes the over travel screw don't move on plastic trigger.if u didn't brake up the safety/sear cage  probably this is the simple case.

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So checked the OT screw and that didn't help. Took the pistol down to frame with the exception of the trigger and trigger bar. Checked the sear cage, cleaned and did a light lube and put it all back together. The problem remains...sort of. Now, the hammer won't lock back when the slide is racked.

I think it's time to see a local CZ gunsmith as I've hit my limit in terms of how to fix this crazy problem. Just can't figure it out. 🥴

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