Question about Hitachi NR90GC2 Cordless Gas Clipped Head Framing Nailer
I have just replaced the cylinder head and gas adaptor on my nailer and now it wont fire properly. It is as if there is not enough power to drive a 90mm nail ans it pushes one out about 10-20mm then wont do the next one and the piston wont return. any ideas?
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Posted on Jan 02, 2017
Yes, BUT the paslode Round drive nails and known to cause driver jamms due to the excessive paper used in the spacing of the nails.
Posted on Oct 31, 2009
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,
Posted on Jan 22, 2010
You have one or more worn o-rings in the head of the gun. They direct the air to the proper parts of the gun to first drive the nail then to return the driver to the top of the gun for the next nail. Depending on the manufacturer and your model number, some companies make kits to replace the o-rings (always replace all of them). For some companies you have to get a breakdown of the gun and order each o-ring seperately.
Posted on Oct 25, 2010
SOURCE: I have a HItachi NR
Likely that debris is lodged between driver and body of nose or bent driver. Easy fix however.
After many broken drivers, I keep and old driver in my tool box and insert it into the nose of the gun. I have ground the driver slightly thinner to allow for debris or the driver that I am pushing with will also get stuck. A couple of swift raps (use a heavy copper or brass hammer to prevent chips of metal from blasting at you) should push the driver back up into position allowing you to clear debris.
If after a couple of hits and the driver seems stuck solid, suspect broken driver. Remove the head and see if the driver piston looks cocked at angle. If cocked, driver broken. Remove cylinder and remove broken driver. If piston looks square in the cylinder, most likely very stuck driver.
With cylinder removed place body of gun on plywood and hammer on the rod that you are using to push.
After clearing problem and with the gun open, clean all parts with diesel fuel and lube with silicone paste lube (or nail gun lubricant). No need to replace orings if there were no leaks. Look at the lower bumper for cracks and replace as needed. Also make sure that the black band fits snugly around cylinder (black band is one way valve, causes piston to return to top).
Good luck with repair
Posted on Aug 10, 2011
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