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Maybe there can be a problem with a rip in the cilinder its a very thin cilinder and its neccesary to replace with all the parts on it because of the extreme heat build up.
cilinder assy 42 41A possible necessary, but first inspect the cilinder carefully on a rift. some other rings or parts broken or worn. Hitachi NR90GC 3 1 2 Gas Powered Clipped Head Framing Nailer Parts
Hitachi sells an adjustable foot attachment that makes it easy to adjust for using your framing gun to install siding or other use where you want more control of how deep the nail sets. Do not remove the safety. Contact hitachi dealer for the accessory. Good luck
The link below will take you to hitachi nailers. Select your model number and find the manual at the bottom of the page if pdf format. Good luck.
http://www.hitachipowertools.com/index/main-navigation/tools.aspx?d=9,43
Best place for parts is www.toolpartsdirect.com. They do not sell a gasket kit. The parts are listed individually. oring kits are available on ebay for about 20.dollars. Use key search "hitachi oring kit". If you have question about your leak and specific cause of leak post again with exact area of leak. Good luck with your repair
go to Hitachipowertools.com and type in your model number and I found it on the last description at the bottom of the page, click on it and you can download the manual. Let me know if you need more help
If the gun is blowing air out the back cap it needs an overhaul. If you take it to a service center they will be able to supply you with the proper O-Rings or if you pay a little more they will overhaul it for you.
Oil leaking out of the nailer anywhere is just an indication that too much oil is being introduced. A good solution would be to reduce the amount of drops until no more leaks out or use an in line oiler at the gun. An oiler costs under ten dollars and feeds in oil vapor as you use air. Store / hang your nailer with the air inlet down at night to drain out access oil. Do not worry too much about the leaking though, I think that a bit too much oil is better than a lack of oil. Good luck.
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