Craftsman stapler modeL 351.181740 WILL NOT FIRE

SOURCE: air stapler leaks air through ''nose''

This sounds like one of the O-rings has failed. Yes it can be fixed. Check to see if HD has an O-ring kit for these guns. That kit will contain all of the O-rings as well as the lubricants for a total rebuild. That should resolve your problem.

Dan

SOURCE: Bostitch stapler T40S2 has air leak at trigger. I

Go to the Stanley Bostitch website. Click on schematics & parts. Find your model number in the drop down list. There is a list of parts and pricing. Just above the parts is a link for the schematic. Honestly, I worked on these things for years. It is best to replace the entire trigger valve. It comes as a kit with instructions grease, and a little tool to hammer your pins out. Lemme know if this helps. Please rate me

SOURCE: my craftsman easy fire stapler diagram

Mine stopped working last night. I took it apart and was able to reassemble it properly.

When both sides are rejoined the tip of the spring has to be inserted in the hole on the corresponding side (note red arrows on both pics)

This is a great stapler when it's working.

SOURCE: Crown Stapler stopped shooting staples

Did you look for a staple jammed in the driver mechanism? If the piston is stuck down, it won't respond to the trigger. Try smacking the top of the stapler onto a wooden bench to see if the force will release the piston. Make sure that you use air-tool oil for lubrication inside the tool. Hope this gets you running!

SOURCE: Bostich narrow crown air stapler won't work

before going about rebuild get can of carburetor spray cleaner and stray the ram area lots of times the glue that holds the staples/or nails builds up and stops up the ram rod spray the rod a few times than with air hooked up dry fire if it frees up lube rod area