When I fire a nail the firing pin does not retract again

pin has debris /bent and needs lube or retractor needs repair

Sounds like you have worn valves or damaged o-rings. Unfortunately Hitachi does not make a rebuild kit for your nail gun. If you go to www.ereplacementparts.com you can find an excellent breakdown of your tool and either order the parts you need there or use the part numbers to search the web for prices and availability. Your tool is on the old side and some parts are no longer available.

Might have a broken firing pin.

May need a new firing valve or safety foot is sticking. Easy to check, Remove air supply, nails and remove the trigger to expose the firing pin. Connect air and place the nose of the gun against thick rubber or coiled air hose. Depress trigger and let go. Gun should fire and trigger pin will return to original position. If piston still does not retract then problem is with trigger valve and most likely the rest of the orings within the gun will need replacing. Not expensive. Remove the air supply and look closely at the firing pin, if it moves quite a bit from side to side and looks worn time to replace. If it look to be in good condition, then orings within trigger valve may be swollen and will not allow the trigger to function. You can remove the valve by removing the 3mm roll pins above the valve and applying air pressure to pop out the valve. Use heavy glove to catch the valve because it could come out with force (reduce air pressure to gun if possible). If gun works ok examine safety foot mech for problem. Use silicone paste lube on orings. good luck

need to rebuild. the kits are about $15

Using a wire "toothbrush" size brush, clean the track in front of the gun where the pin slides - where the nail groove is. **** particles from the nails and the plating from the nails sluffs off fouling the path and causes the pin to stick. After several cleanings of my gun, I noticed that this brushing of the track the firing pin follows keeps it operating for several days without the problem recurring!

firing pin called the driver is probably broken or needs new seals max air pressure 125 psi senco sells repair kits

Check the anvil guide for damage first (ie: burrs, nicks, etc.) Then go to the chamber for the return spring. That is where your problems are.

Your nailer shares design features with Milwaukee and Ridgid. All three brands experience the same issue. Lets go thru a series of simple tests to determine the problem. First and most simple test, manually load the nails and fire the gun untill miss-fire. Upon mis-fire disconnect air, open latch and check if the driver is all the way up into the cylinder or is partially down blocking next nail. If driver is down blocking next nail, replace the driver oring and retest. If driver is up all the way, remove nails, reconnect airline, leave latch open and fire gun against rubber (old tire or coiled up waterhose/airhose) this time holding the gun down and keeping the trigger depressed. In this position, the driver will remain down and feeder will remain retracted. With feeder retracted and screwdriver in hand carefully check the spring tension on the feeder (should be rather firm tension on spring and the feeder must retract with good force). If no tension or weak, replace feed spring. When you finally release the trigger, the driver will retract and the feeder should return with good force. If feeder does not return with force, replace orings and spring behind feed piston. If all tests are ok, remove head, check lower bumper in gun for cracks or missing pieces. Replace as necessary. Lube all orings with silicone lube available at Lowes in the plumbing department. (Danco brand) Good luck on your repair and email your questions.

Yes,this is a common "mis fire" by Pasilode. I own the 16p Framer and the Angle nailer and I never get it from the Framer but I do get it seldom from Trim Gun,nothing you can do ,its just a misfire.

Please rate jj505