Rem 7400 has me stumped


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Old 10-22-2010, 03:46 PM   #1
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Default Rem 7400 has me stumped

I have a friend Rem 7400 apart for cleaning. It some times would not fire the first round. I put it back together and now it fires first time will lock open on the last round but will not fire after being shot once.
1. it will shoot when manualy racked

2. it will not shoot after first round fired

3. it will eject and chamber a new round

4. it will not cock hammer when shot

5. it will cock hammer when you manualy cycle the bolt

6. it will lock open on last round.

I was thinking that it was short strokeing, but it will hold open on last round.
I was also thinking that the sear spring was weak and the hammer was jumping past the sear before it had a chance to engage.
Any thoughts would be helpfull.
Thanks Fisher King.


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Old 10-22-2010, 04:43 PM   #2
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Did you take apart the trigger housing assembly? Will it fire again if you retract the bolt just enough to reset the hammer? It's obvious that the sear ain't holding the hammer back in rapid (regular firing) operation. The hammer is following the bolt down when shot. Check for gunk around the hammer/sear notch & check that it's securely engaging the sear.



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Old 10-22-2010, 05:32 PM   #3
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The trigger will reengage but it will put the new shell out.
The sequence is rack fire the shot ,pull the trigger again nothing, pull back the bolt knocks out the new shell chamber another new shell and it will fire. I did take apart the trigger housing to clean it, I'm shure that everything is put back right but I may have missed something.
I cleaned everything with brakecleaner and oild with G96. I had no spare pieces..
Ican rack it as fast as I can by hand and the sear will hold the hammer back.
There is only one way that the disconector will fit.
Thanks Bear F.K.

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Old 10-22-2010, 05:42 PM   #4
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I was wondering if I tryed to work the bolt by putting a cleaning rod down the barrel and working the action that way if it will hold. I was thinking that because of the way I'm racking it by hand it is putting force lower or twisting the bolt to reengage the hammer and sear.
F.K.

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Old 10-22-2010, 06:24 PM   #5
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No that's not it. That just affects the speed of operation. I wish you was closer so you could bring it by. I hate to say it but you have something turned around or in wrong. It's hard to say without looking at it exactly what's wrong. Go to the exploded drawing at gunpartscorp.com and double check everything.

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Old 10-22-2010, 09:47 PM   #6
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Sounds like the bolt travel is very close to cocking when fired and not catching the hammer. The trigger assembly pins might be bent. Replace them is so and it might be the fix.
A fellow gunsmith had a great deal of work on the Rem auto loaders, but he passed a few years back.
Out of my area, but I do recall this issue being repaired with replacement pins.

good luck

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Old 10-25-2010, 11:14 AM   #7
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I found out what was wrong and I feel a little stupid when I look back now. I had the diconector bar above the disconector than under it. I droped the trig assembly out of it and it was starring me in the face..
I had better look better the next time before I make my self look stupid for every one to see. Kinda like dreaming your naked infront of a whole autitorim of your peers.
Thanks again Fisherking

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Old 10-25-2010, 03:08 PM   #8
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Glad you figured it out. It didn't make you look stupid at all. We all have had something like that happen to us at 1 time or another.



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