SOURCE: i own a hitachi nr90ac3 framing nailer and i
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.
SOURCE: When I attach the air line it starts leaking air
There are actually about 6 oring's inside the trigger valve. And there is a hard rubber ring that gets brittle over time and disintegrates to small little pieces. Most of the trigger assy's for bostitch are very inexpensive and you can purchased directly from their website. The only thing you need to do to replace one is to remove the roll pin that holds the actual trigger with a punch and then remove the roll pin that holds the valve in. Put a rag or towel over the valve area and point the gun away from yourself. Briefly hook up the air and the valve will pop out. Then you need to line up the new valve and insert it. Then put your roll pin back in and the reinstall the trigger.
SOURCE: looking for a manual for an Hitachi Framing nailer
Go to Hitachipowertools.com and type in your model number and you can download a manual for this tool
SOURCE: Air leaking aroung the trigger assembly from my Hitachi NR83A
if you took the trigger apart the part that you unscrew has a nylon ball and a black rubber ring you should check them and make sure that you didn't loose them when you took it apart,if they are there, then you need to service the gun, and after you clean all the moving part and you put it back together, it may still leak from the top,Take a rubber hammer and give it a good hit,now not to hard, and it should seal
SOURCE: air leak
My Guess is that it needs a new "O " ring or some other form of seal some where round the trigger actuating spindle. Should be quite easy to fit if you can get one the right size
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