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Re: the nailgun only shoots the nail in halfway
The Hitachi nv45 series guns are lifetime guns and parts (parts available at www.toolpartsdirect.com) are not too expensive. There should be no air leaks for best results. If air leaks from the trigger area remove the trigger and white plastic plunger. Make sure that the plunger has oring and the ball that the plunger acts against is whole. If air is leaking from the boot around the firing pin then remove the head of the gun and pull off the cylinder ring and check the outer oring. (After you remove the head, the cylinder ring is the part that has two threaded pull points, the outer oring sometimes breaks causing leak) With the head off push the piston all the way down and make sure that the driver extends about 3/16 past barrell. If the end of the driver is wrorn to round shape, you can grind it square if there is enouth length left. If the sheet seal is good the driver will not pull out of the cylinder.(look at parts diag. to find sheet seal, it is below the bumper) If the driver easily pulls out of the cylinder then open the gun from the bottom and examine the bumper and sheet seal and replace as neccessary. If the driver will not pull out of the gun (thats a good thing) then pull up and to side enough to peek/look at the lower bumper to check for cracks or missing pieces. The driver oring should hold the driver in upper position. Check that the top edge of cylinder is smooth and seals against the vinyl part in the head. Use caution not to damage the top edge of cylinder. The oring kit for this gun will cost about $20, however you only have to replace the worn parts for good results. Let me know if your air leak is somewhere other than stated above or other questions. Good Luck
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Sounds like you may have a nail jam. You didn't specify what type of nailer you have - most finish guns have a latch to open the nose & clear a jam - if it is a framer most of the time it requires a long punch and a hammer to push the driver back in past the jam to clear it. Let me know if this does not fix your issue.
The SFN1 is a great nailgun, built for professionals, and is pretty much indestructible. It's air leak is most likely an O ring that is worn out. While it is theoretically possible to figure out which one it is, and replace it, the smart move is to have the gun rebuilt by an approved service tech. I usually pay about $60 to have my SFNs gone through. My oldest SFN1 is 18 years old, and it has only been rebuilt once.
Air leaking at the trigger is caused by faulty orings in the trigger valve. You could replace the orings in the valve or replace the whole valve (not expensive on ebay, look for generic tva6 valve usually less than $20). Good luck
The only adjustment on nail guns is for the nail drive depth, the magazine is hard mounted to the nose piece. If you are having problems with the nail clips feeding, first make sure the entire feed path is clear of any nails, parts of nails or other foreign things. Then make sure the nails you are using are fully compatable with your nailgun. Your gun needs 16 guage nails set at a 20-degree angle no shorted than 1 1/4" and no longer than 2 1/2" long. Any deviation from those requirements will only give you a headache worse than what you have now.
A nail gun works on compressed air. When you hook the air hose to the gun it fills a cylinder with air pressure. When you pull the trigger. the cylinder pressure is released onto a firing pin that shoots the nail. The air pressure line is also connected to the trigger and therefore the trigger has to be sealed.
When ever using a nail gun, you add a bit of gun oil in the back of the gun (not 3-in-1motor oil, it has to be non-detergent gun oil)
If you haven't used the gun in a while, it is best to oil up the gun and let the oil run down into the gun. If you use anything but gun oil, the seals will give out.
Your trigger seal has given out. It is probably an 'O' ring. You can access it by taking it apart. Look for the O ring. Bostich makes re-build kits for the different guns that you can buy on-line. Back when I was in construction, there were several nail gun shops that sold and serviced nail guns, and sold nails to the contractors. I don't know if that business model is still active or if you have to send the guns to Bostich service center.
Nail guns either have a switch or a seperate trigger assembly for two options - automatic, or 'bump' fire, and sequential fire. Sequential firing may be best for you since the nose must be fully depressed and the trigger pulled for each nail.
If you're stuck with bump firing, practice your technique. Double fires often occur when the workpiece bounces back into the nose of the gun; learn to 'bounce' the gun off the material to avoid this second contact.
If you're getting double fires in sequential mode, the problem could be more serious. I keep a can of aerosol silicone lubricant on hand to clean and lubricate the feed mechanism and magazine. Make sure your tool is clean and lubricated before each use, including the 3-5 drops on the air coupling.
Check that your air pressure is not set too high. Overdriving nails reduces their effectiveness and can cause tool malfunction.
This problem could also be caused by worn out O-rings or other parts within the tool. If you're not comfortable servicing the tool yourself, take it in for repair/maintenance work.
Another important thing to remember: With tools like this, you get what you pay for. A cheap nailgun will never function as well as a quality nailgun.
On most all nailguns when the trigger is activated air pressure is released from the headvalve causing the headvalve to open and fire the piston. If air leaks through the headvalve orings or through the headgasket port to headvalve, it will not fire. Try applying light grease to headvalve orings and make sure that headgasket is sealing around vent hole. If it fires then replace orings in headvalve for long term repair. Secondary problem is worn safety parts and trigger or trigger pin. If these parts are worn the trigger will not push the trigger valve pin all the way in when you bump fire the gun. With air supply disconnected, apply pressure to safety while depressing the trigger and check thet the pin is moving all the way into the trigger valve. Adjust or replace as necessary. Enjoy