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SBE 2 firing problem


ipduck
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Have a problem that started this morning hunting, would like a quick fix if anyone has a suggestion. Anyway, gun is not firing.

 

I believe the problem is with the hammer. The firing pin is not hitting the shells. There does not appear to be any problems with pin or the action as I fully disassembled it already, and reassembled it, still no mark on unspent shells.

 

However, the hammer which flips up and hits firing pin in this case appears to be loose.

 

As the trigger is pulled it releases and hits pin, but I believe without enough force. After the hammer is in the fired position it no longer is under tension and will flop back and forth. I believe it should "automatically" return to unfired position if another shell is chambered or it should stay in contact with pin if no other shell is chambered.

 

If anyone has something useful or has had this happen please let me know.

 

Thanks

 

dk

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Thanks for the reply.

 

I believe you are correct with a spring issue, but I don't have the confidence to start disassembling the trigger mechanism to find out.

 

It had fired multiple rounds before it stopped firing, so I don't believe it was a reassembly issue.

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Test the trigger assembly for proper function this way.

 

Remove the barrel, forearm, and bolt group.

 

Figure A shows the hammer in the cocked position. It is held in this spring-loaded state by the sear, which engages a notch on the backside of the hammer.

If you hold your thumb against the hammer and pull the trigger (safety off), you will feel the spring driving it forward.

 

A.jpg

 

 

Figure B shows the hammer in the relaxed/resting position.

Movement in the direction of the arrow will compress the spring and you will feel resistence.

Forward movement (opposite of the arrow) from this perpendicular position is free and loose.

There is quite a bit of side to side play in the hammer as well. This is normal.

 

b.jpg

 

continued in next post....

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goofy forum won't let us post more than two pics :mad:

 

Figure C shows the hammer in its fully forward position.

From B position to C position, the hammer free-falls.

 

c.jpg

 

The full function can be safely tested with the assembly as shown or with it fully removed from the receiver.

 

No tension as shown in B indicates a broken hammer spring.

 

If there is tension, but the hammer won't stay cocked, as in A, then the sear or hammer my be damaged.

 

DO NOT load or hunt with this gun until you have determined that everything is functioning as it should be.

 

More detailed parts diagrams can be viewed on the Benelli Italy website.

http://www.benelli.it/index.asp?Lan=EN

 

Click Support

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Tucker,

 

Thank you very much for your post. It was exactly what I was looking for. I was unsure if the hammer was supposed to free fall from the resting position. I have tension where it needs it, so I am still stuck with a gun that will not fire, but at least I have narrowed it down some.

 

Thanks again for the photos those were a major help, also excellent job explaining the diagrams. Very helpful post.

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You're welcome.

 

If the trigger, sear, and hammer are all functioning properly, then it almost has to be a problem with either the firing pin or the headspace (the depth at which the shell rests in the chamber).

 

Further diagrams in my cleaning guide show the proper assembly of the bolt group.

Make sure that you have the firing pin inserted properly and that it clears the bolt face when depressed from the rear.

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There is a shoulder on the front of the firing pin that prevents the firing pin from sticking out of the Locking Head Assembly too far. I have seen buildup of residue on the inside front face of the Locking Head Assembly prevent the firing pin from extending out far enough to hit the primer sufficiently.

 

To clean this area, spray solvent inside the Locking Head Assembly, insert the firing pin and twist it in a circular fashion to clean away the residue. Then flush well with solvent and let dry before lubrication and reassembly. This is how I fixed one that this happened to. I had no tools with me so we used the firing pin to clean out the residue. There might be some tools or brushes that could be used too.

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