Question about Hitachi Nr90Gc2 Cordless Gas Framing Nail Gun Clipped Head Nails 50 90mm + 2 Batteries

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On my nr90gc2 nailer the firing pin does not return after firing a nail. Have cleaned ,changed o rings, lubed.

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Posted on Jan 02, 2017

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SOURCE: It will double fire sinking second nail only half

the pin pushing your nails is loose and the guides are warned .
try to change the guides and you will see that this problem will will be gone .
one last thing , make sure the coils are in good shape as it may create some feeding problems and push 2 nails at once

Posted on Sep 26, 2009

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SOURCE: pin to drive nails does not return

the piston that drives the nail is commonly known as a single acting spring return meaning air pushes the piston and the drive pin down driving the nail in and a spring is supossed to push the piston and pin back up to load the next nail the springs are not usaly very strong so lubrication could be the problem as well try using some "air tool oil " available anyplace airtools are sold do not use wd-40 or engine oil while these may offer temporary help they will come back to haunt you if a good oil doesn,t sole your problem then its "spring time" although they have lots of safeties built in when working with a problomatic nail gun please be careful high presure air risk of injection fast moving projectile again risk of injection Good Luck

Posted on Oct 09, 2009

  • 12 Answers

SOURCE: bostitch roofing nailer wont return driving pin but moves freely

If the driver moves on it's own then it's o-ring is shot,replace it. Pop the feeder cap and clean all the roof crud that's built up underneath it.Now you can see the feeder spring,check to see if broke or old and replace.The feeder plunger is air assisted so hook the air up and depress it, it should depress hard and pop right back up. If not it needs to be cleaned and new o-rings. If this doesn't work then it's a new feeder plate you need. good luck.
5run7

Posted on Oct 14, 2009

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SOURCE: Hitachi NR83A2 nailer pushes next nail down

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,

Cheers

Posted on Jan 22, 2010

kb8dns
  • 494 Answers

SOURCE: my hitachi nr 90 gc nailer was always slow to fire

Trigger may be dirty, as an electrical switch the contacts can be intermittent. Also check to see if the safety plunger is set to correct depth and moving freely. Dirt can build up here......

Posted on Feb 14, 2010

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Most likely stuck trigger valve. Easy to check. Remove nails, remove trigger to expose the firing pin of trigger valve. Connect air and very quickly depress the firing pin all the way in. If the gun fires , adjust the safety to depress the trigger valve completely. If the gun does not fire, replace firing valve, or remove and check /lube o-rings in valve. Good luck

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Are the nails moving freely in the magazine if you pull the mag spring back? If so, then the driver blade is not returning to top dead centre - leaving enough of the blade to stop the next nail moving into the nose. This could be caused by a slight back pressure in the cylinder so, check the exhaust is clean and free of any swarf. Or check the O Ring on the driver blade, even though you've just replaced them....

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Check the date of the bottom of the gas. With the gas removed when you fire it you should hear a faint spark sound from the top. If gas is in date try putting it in your pocket for 10 minutes to warm it up. Open the front and make sure the piston is pushed all the way up into the machine.

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When you pull the trigger air comes out near the trigger and no nail is fired.


The problem that you describe indicates that the orings within the trigger failed. You could replace the orings if you have a source for very small rings (2mm x 1.5 for the firing pin inside the trigger valve) or just replace the whole trigger assembly (under $10). Lube all orings with white grease or silicone paste lube (remove head and lube head valve assembly). Good luck

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Here is a tip that I wrote about the Paslode nailers and the problems that can come up with them.

I also have a link to the Paslode manuals which contain Paslode cleaning and troubleshooting guides.

If you need parts for your Paslode, there also is a link for a site that sells the Paslode nailer parts.

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heatman101



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When I fire my im250 the firing pin often does not retract fully, so not letting the next nail to progress. I regularly clean and lub the gun and it fires all the time so the problem is not at that end of...


Using a wire "toothbrush" size brush, clean the track in front of the gun where the pin slides - where the nail groove is. **** particles from the nails and the plating from the nails sluffs off fouling the path and causes the pin to stick. After several cleanings of my gun, I noticed that this brushing of the track the firing pin follows keeps it operating for several days without the problem recurring!

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This is a discontinued tool by Senco but there are still parts available for it. It sound to me that the o rings and possibly the firing valve need to be replaced. I would recommend going to Senco.com and you will find a complete parts diagram in their discontinued tool section. They also have a toll free number if needed and you can talk to their air pro. I have rebuilt quite a few of these and they are not that hard just make sure to clean all the parts and use lube when replacing O rings.

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