Question about Hitachi 3 - 1/4" Framing Strip Nailer
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Posted on Jan 02, 2017
SOURCE: air leak
Several models of hitachi nailers share the same orings and other parts including the check ball under the trigger pin in your gun. Remove the roll pin holding the trigger to release the trigger pin, (plastic with one oring) then remove the valve with a screwdriver. Replace the vinyl check ball and seal. Parts are available at www.toolpartsdirect.com. This should fix the problem that you are describing, however use caution and check that the safety if properly adjusted. Enjoy
Posted on Dec 07, 2008
SOURCE: Hitachi NR83A air leak
Most all Hitachi nailers that use the plunger style of firing/safety mech will leak air past plunger (part #877-339) when firing, however should not leak when connected to air or resting. If air is leaking past plunger when connnected to air check following:
Remove head to reveal cylinder plate (part#877-318). Remove plate and check outer oring for nicks or broken. If nicked or broken, replace and problem solved. If in good condition, remove cylinder guide (part #877-310) and check two outer orings for nick /cut. Use caution when removing/installing cylinder guide. It is easy to pinch orings when installing causing air leak at plunger. If orings are in good shape then problem is warped body of gun not allowing outer orings to seal. To check for warped body, use the cylinder plate as a guage by lowering it into the area where the cylinder guide rests. Good Luck with your repair.
Posted on Mar 12, 2009
The nail gun should have came with some lubricating oil. A couple of drops should be installed where you connect the air hose to the nail gun every time you use your nail gun (or per the manufactures specifications) This helps lubricate all the internal o-rings. You may have to put a few drops in and use the gun a bit to get it to seal up. If it still doesn't after that, it may need the o-rings replaced.
Posted on Jan 20, 2010
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
Posted on May 04, 2010
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