Hitachi NV45AB2 Roofing Coil Nailer  "replacing piston rings" Questions

...piston o-ring is worn and needs replacing. However the most common cause of the problem in which the driver will not retract at all, is that an o-ring has broken or has popped off of your piston ...

...piston. One more thing, don't overlook the brass valve actuated by the trigger. The brass valve has three o-rings that may have gone bad and this will cause the tool to fire intermittently if it even ...

...replacing all the o-rings. I'm assuming you have already taken it apart this far but if not: Remove the 4 hex bolts on the cap and remove the head. Using 2 of the bolts - thread them into the inserts ...

The piston slipped out of the housing-how do I install that? The piston is broken if it came out. Remove the 4 bolts on the head, remove head and you will see the piston - be careful removing it ...

...piston drives down with out pulling trigger and stays down as soon as air hose is connected. All seals and o rings have been replaced with new ones If all of the o-rings have been replaced in the gun ...

piston driver is not going back into position. OK, this should be relatively easy.... On the face of it, either there's an O Ring that's leaking or, the Bump stop is not sealing properly. Either way, ...

driver will not retract after firing Generally caused by three issues. Bent driver, worn or cracked lower bumper or worn piston ring. Remove nails and tilt nose of gun up then down; the driver should ...

...piston no longer returns all the way to the top, thus blocking the next nail from entering the firing chamber. Lubricating and replacing all o-rings did not help. No obvious signs of wear, dirt, or ...

...piston retract after firing? Bad bumper inside. Because of the upperpart above the cilinder could have mechanical or leaking problems , replace o-rings that beating on the cilinder in the upperpart ...

My FC350 driver was not retracting all the way and found the piston stop in many pieces. Can I just replace the piston stop without changing the cylinder cap with all but one tab on the inside broken?