I have 2 Hitachi roofing nailers that were only used twice. They both have developed the same problem. They shoot every other nail & only sink them half way.
I think you have two different problems , replace the feeder spring, and replace the oring on the driver piston. also make sure that the coil of nails is perfectly round if they are dropped or squeezed tool will not work right
SOURCE: Hitachi nailer does not sink nails completely, no
You must have broken tip or out of adjustment. Easy to check. Remove nails, and push safety against scrap air hose or rubber to absorb blow and squeeze trigger. Piston will stay in the down position until your release safety (on some models you will need to pull back on feeder sligtly). While piston is down examine the end of the driver for nice squared off tip protruding about 1/4 inch beyond nose. If no tip or looks broken, replace driver. If tip looks complete, adjust for more depth. Good luck
SOURCE: won't feed nail
This happens to my gun too. You probably need to oil the gun once in a while. Here is how you fix it:
Disconnect the gun from the compressor first don't wanna get hurt or anything like that. There is a pin that shoots the nail out well that pin is jammed so what you have to do is push that pin to the original position. using a flat head screwdriver would help you to push that pin back into place. Let me know how that turns out please. I pretty sure that is the problem with your gun. Make sure you lubricate the Nailer once in a while.
SOURCE: Hitachi NR83A2 nailer pushes next nail down
Are you using full round head nails?
The hissing indicates your O-rings are worn out and need to be replaced. This is not covered by warrenty and is common for all nail guns. Lots of kits are available on Ebay or your local Hitachi service center should stock them.
Hope this helps,
Cheers
SOURCE: My hitachi nv45ab2 roofing coil
Hitachi coil roofing nailer will skip nails if the piston oring is worn, the feed spring is weak or lower bumper is cracked. Easy to check. Remove nails and air supply. With side door open point nose of gun up then down again. If the piston moves up and down in the cylinder, replace the piston oring. If piston does not move and is in the up position, check the feed spring for tension. With air supply removed and door open, slide feeder back and press on feeder from door side to check tension. It should spring back to position against rails.If is feels loose, replace spring and retainer pin if the pin is worn. If piston oring is good, and the feeder has good spring tension, suspect lower bumper and the plastic part below the bumper called the "sheet". Remove head and pull the cylinder to examine lower bumper. Parts are available at www.toolpartsdirect.com. Good luck with your repair
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