I guess my Senco model-L pin nailer blew a seal – Its probably 15 years old, I was using it on a very hot day, and something popped inside, followed by a rush of air. Now it just hisses when I hook the hose up to it. Is this a do-it-yourself fix, or, if not, who does repairs on these? Its been a great little gun, and I’d like to get it back up and running. Thanks!
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Is there a cap on top of the body? If so, take out the allen screws and see if you can pop the piston out of there. The piston probably has an O-ring around the top and this ring may need to be replaced or re-seated. If it's not obvious I would take it to a repair shop and they'll replace the other seals.