SVT-40 issue

[Zombie Stalker]

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Hi all - went to the range yesterday with my SVT-40 . Fired 1 round and it would not eject the spent cartridge . I figured gas was set too low. However , I could not pull back the bolt at all . Took out mag , pulled off bolt cover and took out spring/pistons . Still could not get bolt to go back . Hammer was stuck in forward position and would only move a couple of mils .

I got out giant screwdriver and needle nose pliers and finally muscled it back into the down position . After I put it back together , it dry fired perfectly , but I didn't shoot it anymore ( glad I had Mosin and SKS with me ) .

Even if gas was too low , I should have still been able to pull back bolt and cycle rounds manually , so was this a trigger problem ? I fired it last year and it worked perfectly . I cleaned it right away , and have cleaned it again and Frog Lubed it since. Did I install trigger assembly wrong ? What would cause this ? Going back to range again in a couple of weeks to try again .

Is there a way of telling if trigger assembly is installed wrong ?

Used surplus ammo last year and yesterday. Cartridge was not split or marked funny after getting hammer back.

Thanks.

 

[Arloashean]

Could be the bolt or the bolt cover was not on the right tracks on one side?

I assembled once like this and it slid enough to allow the bolt back and forward. But then got stuck. Didn't look wrong but it sure felt wrong. Glad I didn't fire it that way!

After taking it back apart I was able to assemble again and it was fine.

 

[Zombie Stalker]

Took it apart to make sure bolt assembly and bolt cover were in the right grooves . I'm pretty sure they were . Still have my doubts about the trigger - I may have put it back in wrong. So I tried to take out trigger - no go . The little ring won't move . I can't move it with a punch or vise grips or screwdriver , it will not slide at all . What now ? I put some WD40 on and hope it penetrates enough to get that little ring to move . Will try again today.

 

[svt1940]

Took it apart to make sure bolt assembly and bolt cover were in the right grooves . I'm pretty sure they were . Still have my doubts about the trigger - I may have put it back in wrong. So I tried to take out trigger - no go . The little ring won't move . I can't move it with a punch or vise grips or screwdriver , it will not slide at all . What now ? I put some WD40 on and hope it penetrates enough to get that little ring to move . Will try again today.

When the little gate is opened at the rear of receiver,the trigger group release catch is flush with the receiver? If not flush, the trigger group is not fully seated and also the gate must be opened at 9 o'clock and sometime,you may need to move it a little while pushing on the group release. The way pieces where fitted at the factory vary so sometimes, things dont go always easy.
Joce

 

[Zombie Stalker]

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Merci beaucoup ,Joce .
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You were right about the little gate . It had to be at exactly 9 o'clock . I tried at every other position and the little ring wouldn't move. Once I put it at 9 o'clock , no problem , the ring came loose and my trigger popped out . I put the trigger back in , but couldn't make it click in . I had to give it one little tap with hammer and punch , right where the spring is at the back , and it clicked in perfectly .
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Going to try firing it again today or tomorrow ,depending on the weather . Thanks again,
ZS

 

[svt1940]

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Merci beaucoup ,Joce .
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You were right about the little gate . It had to be at exactly 9 o'clock . I tried at every other position and the little ring wouldn't move. Once I put it at 9 o'clock , no problem , the ring came loose and my trigger popped out . I put the trigger back in , but couldn't make it click in . I had to give it one little tap with hammer and punch , right where the spring is at the back , and it clicked in perfectly .
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Going to try firing it again today or tomorrow ,depending on the weather . Thanks again,
ZS

Keep us informed
Joce

 

[Zombie Stalker]

It looks like I have the same issues as a couple of other people on here - failure to extracts and stovepipes .I'll tear it down and clean everything especially the gas system .

I went to the range yesterday and the very first round fired but wouldn't eject . I can't even pull the bolt back by hand . It barely budges ,so , I give it a little whack with my hammer , and that loosens it . Now , I can pull back the bolt and the spent round drops out . I change the gas to 1.5 or 1.7 ( can't see very well) and it fires perfectly for about 20 rounds .

Then it starts up again , failure to extract with bolt jammed forward . Whack with hammer and good for about 5-10 rounds . I did this for about 60 rounds with some FTE's and a few stovepipes thrown in for good measure.

Gonna clean the gas system and put back together, but even if gas is too low , shouldn't I still be able to pull back the bolt ? Why does the bolt seem to get hung up about 2 inches back from the bore ?
Ideas ??

 

[desporterizer]

Check for rust pitting in the chamber.

 

[red_bailey]

It looks like I have the same issues as a couple of other people on here - failure to extracts and stovepipes .I'll tear it down and clean everything especially the gas system .

I went to the range yesterday and the very first round fired but wouldn't eject . I can't even pull the bolt back by hand . It barely budges ,so , I give it a little whack with my hammer , and that loosens it . Now , I can pull back the bolt and the spent round drops out . I change the gas to 1.5 or 1.7 ( can't see very well) and it fires perfectly for about 20 rounds .

Gonna clean the gas system and put back together, but even if gas is too low , shouldn't I still be able to pull back the bolt ? Why does the bolt seem to get hung up about 2 inches back from the bore ?
Ideas ??

Clean the chamber with vigorous brushing and solvents to make sure there is no build-up and cases slide out freely. It may not be as simple, with the SVT's fluted chamber, as spinning a bronze brush in an electric drill.

If it's working for a while, and then it isn't, I can think it would be related to heat, build-up, or parts coming loose.

The gas regulator is a five-sided nut, with five corresponding holes of increasing size to port combustion gases through. To get the hole in proper alignment you should have a flat side (stamped with the size number) facing straight up; you don't get intermediate settings by going in between numbers. If the static piston isn't screwed in tight, the regulator could change position while firing (and probably also give weaker than designed gas pressure). The gas system is easy to take apart, and the special SVT tool has a notch for the piston and a socket for the regulator, but you can easily use other tools.

Clean the gas system for sure; if you need to clean out the holes, a needle and stout thread soaked in solvent should do the trick, or come to think of it you can buy woolly dental floss for cleaning braces. Do you run the gas system dry, lightly oiled, or dripping in it?

Is the bolt getting stuck with the extractor gripping a stuck case, or further back in its travel? The first is common with chamber build-up and low gas, but the second probably means you have the springs installed wrong. Take it apart to inspect the sliding surfaces for possible rough spots that might account for it, and ensure the springs go back in correctly.