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Thread: Pedersoli 1874 lock issue resolved.

  1. #1
    Boolit Buddy
    Join Date
    Oct 2016

    Pedersoli 1874 lock issue resolved.

    Just posting an FYI for those of you who have a Pedersoli Sharps. I had my most recent range trip scrapped from a rifle lock malfunction. Could have been a serious safety issue as after firing a few shots my hammer would not lock back at full cock. My rifle was also able to fire from the 1/2 cock position. If I set the triggers first , then cock the hammer they seemed to function correctly, however there was something serious going on . Once I got home I disassembled the lock and first off the 3 screws that hold the "bridle" bracket were all loose. I further realized you can't lock down one of the 3 screws as it jams the sear and won't function properly. So I ended up using red Loctite and setting the correct screw tension just enough to allow the sear to pivot smoothly. Reassembled everything and still no go. No engagement at full cock. Now I'm getting aggravated as nothing looks visually bent or broken. I revert to the manual and start reading on the double set trigger adjustment procedure and there's info on adjusting the trigger mainspring preload. I started playing with small adjustments on the screw and low and behold adding 1/2 turn on the screw allowed the hammer to positively lock at full cock. Backed the adj off 1/2 turn and yup the hammer would not lock. There is a small window of ideal adjustment on the mainspring. Too much preload and the hammer won't fall when the trigger is pulled. Too little preload is dangerous and can cause the hammer to not lock securely and drop, or worse fire unintentionally. I erred to the safe side and set the preload as tight as possible and still allow the trigger to drop the hammer. Bottom line somehow my preload adjustment screw backed off a tad and allowed the hammer to not lock. Thank god I had a firm grip on the hammer when the issue first surfaced. I took photos of the bottom of the trigger plate, and I measured the depth of the mainspring adjustment screw and created a Word doc for quick maintenance reference for future.

  2. #2
    Had one of mine apart before too for loosening screws. Just felt kinda funny when I had it out shooting. Ended up putting some clear nail polish on that screw myself. Wish they would have shouldered it so a guy could bottom it out, but oh well. My latest one has a mainspring tab that doesn't engage as much as I'd like it to, but no problems so far. Shoots nice too

  3. #3
    Boolit Master marlinman93's Avatar
    Join Date
    Mar 2009
    Might consider putting blue Loctite on that mainspring adjustment too, just so it stays put.

  4. #4
    Boolit Buddy
    762sultan's Avatar
    Join Date
    Oct 2012
    100 miles from anywhere important
    Recently purchased a Pedersoli 1874 and will take this advice to heart. Can't be too safe.

  5. #5
    Boolit Buddy
    Join Date
    Mar 2016
    I had a similar problem with mine except it was the screws that held the lock in place on the rifle. While I had the rifle it became a normal thing to check those two screws. Not like I was shooting heavy loads either just a 330gr @ 1340 fps but I was shooting a lot of them.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check