smeck Posted February 2, 2012 Share Posted February 2, 2012 (edited) ............................... Edited December 21, 2012 by smeck Quote Link to comment Share on other sites More sharing options...
etale Posted February 2, 2012 Share Posted February 2, 2012 Definitely not right. I would call Benelli on this, as it looks like a defective part. I have about 450 rounds through mine and my hammer spring cap is virtually pristine. Quote Link to comment Share on other sites More sharing options...
KB Fab Posted February 2, 2012 Share Posted February 2, 2012 Yep, doesn't look right. Mine has a similar count and looks like this. Quote Link to comment Share on other sites More sharing options...
StrangerDanger Posted February 3, 2012 Share Posted February 3, 2012 Even after 13k, mine looks nothing like that. The part is surely defective or there is a problem causing the abnormal wear. Keep an eye on the replacement and see if it is wearing the same. Quote Link to comment Share on other sites More sharing options...
heckler&kochp2000 Posted February 3, 2012 Share Posted February 3, 2012 This doesn’t look right to me, and round count is less than 500. [ATTACH=CONFIG]1319[/ATTACH] Time to replace? Did you replace any aftermarket internal parts prior to the cap looking like this ? Quote Link to comment Share on other sites More sharing options...
tactical1 Posted February 3, 2012 Share Posted February 3, 2012 Without pulling my trigger group, you sure the cap is aluminum? Would think that would be steel with the heavy loads on it - if so, it requires Italian moly. Quote Link to comment Share on other sites More sharing options...
benelliwerkes Posted February 3, 2012 Share Posted February 3, 2012 does the "aluminum" hammer spring cap pass the magnet test ? Quote Link to comment Share on other sites More sharing options...
benelliwerkes Posted February 3, 2012 Share Posted February 3, 2012 (edited) AHA. The old magnet trick works again. All the trigger group components are steel except the carrier which is a light weight non-ferrous alloy. I was studying your photo.....it almost appears that the action lever tab that engages the hammer spring cap, is bent to less than 90 degrees ? parallax, or is it really turned inward ? Edited February 3, 2012 by benelliwerkes Quote Link to comment Share on other sites More sharing options...
tactical1 Posted February 4, 2012 Share Posted February 4, 2012 Don't think the tab has any influence on the damage to the cap - it is stationary and just hold the cap in place. Can you push the cap down easily? No binding etc when it moves down? If it moves freely, I would suspect a defective cap. The gouge in the center appears to coincide with the impact point of the hammer - high load point. The hole area would be a bit weaker having less surface area to handle the load - if the cap "tube" would have too much grease in it, maybe it could not move fast enough or had too much resistance - I think the hole is a vent hole similar to the screw on the back of an AR stock letting air move when the buffer moves - if the "tube" the cap moves in has too much grease/oil, maybe it does not retract properly and has too much resistance to the hammer and therefore the gouging of the metal. Quote Link to comment Share on other sites More sharing options...
benelliwerkes Posted February 4, 2012 Share Posted February 4, 2012 [ATTACH=CONFIG]1321[/ATTACH] Normal tab has about a 85 degree angle. Quote Link to comment Share on other sites More sharing options...
etale Posted February 4, 2012 Share Posted February 4, 2012 tactical1 has a good point about the grease. I would definitely *NOT* use grease in the hammer plunger/ spring area, as it is incompressible and too viscous to rapidly expunge out the vent hole. In fact, it's a common automotive technique to pull clutch bearings by packing the recess with grease and hammering in a plunger (e.g. solid steel rod) with interference fit to the inner bearing: the force of the plunger is transmitted through the grease to the bearing outer race, thus driving it out of its recess. Point being: if there is captive grease below the plunger when the hammer strikes it, the plunger will be prevented from fully depressing into its recess. Something has to give way, and given how hard the hammer is, it's going to be the plunger cap. I just run a very light lubricant (e.g. machinegunner's lube from LaRue) throughout my trigger group, *except* for the sear contact/ engagement points, where a small amount of grease is appropriate. Quote Link to comment Share on other sites More sharing options...
tactical1 Posted February 7, 2012 Share Posted February 7, 2012 (edited) smeck - nice job with the pictures - good process of elimination as well. Probably just a bad cap and the new one will be fine. Edited March 24, 2012 by tactical1 Quote Link to comment Share on other sites More sharing options...
tactical1 Posted March 24, 2012 Share Posted March 24, 2012 Any updates with the replacement part? Quote Link to comment Share on other sites More sharing options...
Unobtanium Posted April 12, 2012 Share Posted April 12, 2012 tactical1 has a good point about the grease. I would definitely *NOT* use grease in the hammer plunger/ spring area, as it is incompressible and too viscous to rapidly expunge out the vent hole. In fact, it's a common automotive technique to pull clutch bearings by packing the recess with grease and hammering in a plunger (e.g. solid steel rod) with interference fit to the inner bearing: the force of the plunger is transmitted through the grease to the bearing outer race, thus driving it out of its recess. Point being: if there is captive grease below the plunger when the hammer strikes it, the plunger will be prevented from fully depressing into its recess. Something has to give way, and given how hard the hammer is, it's going to be the plunger cap. I just run a very light lubricant (e.g. machinegunner's lube from LaRue) throughout my trigger group, *except* for the sear contact/ engagement points, where a small amount of grease is appropriate. The cap is hollow and there is ample space inside of it not occupied by the spring for this to not be a concern. If it were a concern, the shotgun would have a very hard time cycling, as the hammer must be cocked during the rearward passage of the BCG. I am a fan of grease on sliding metal parts, which this cap is. Quote Link to comment Share on other sites More sharing options...
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