Question about Porter Cable Cable BN125A Factory - Reconditioned 18 Ga., 1 1/4" Brad Nailer Kit

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BN125 Wont fire

Got a BN125A wont fire even after a complete rebuild kit Piston moves freely pin not bent.Just a soft dull thud No action.

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Did you rebuild the trigger plunger? Check the plunger on the trigger. Sometimes junk will set up in the seat and cause low flow of air.

Posted on Jan 15, 2010

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The trigger plunger answer is a good lead. I found that part number 202 is swollen a bit and it sticks in the nailer body and part number 204 sticks in it. I carefully by hand with my fingers reamed out the hole with a sharp 7/32nd drill bit until part number 204 was no longer sticking. Then I poked the shaft of the drill bit into the hole, gently chucked the drill bit into a drill press and filed the outside of the piston a little bit and then smoothed it with 320 sand paper so it slides in the nailer body hole without sticking. Viola. Nailer works great. Part number 201 fell apart. I replaced it with an 'o' ring for 23 cents. 'O' ring 109 cracked. This one cost 46 cents. As built these two 'o' rings are made of clear plastic. The two 'o' rings 205 that fit on part number 204 are smaller than the smallest 'o' rings at my local hardware store, but they were not bad either. I added a couple of drops of pneumatic tool oil to the parts before reassembly. Total cost of repair was a little time and 69 cents.


Posted on Sep 01, 2010


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I've had to remove the plate over the "firing pin" a couple of times (the allen wrenches come with the gun) to release it. Mine was caused by a bent pin, that happened when I hit the hose and knocked it off the bench.

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