Question about Hitachi NR90AD 3 - 1/2'' Clipped Head Strip Nailer

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Gun does not fire and the inside piston moves freely. How do i fix this?

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You need an o`ring kit
I have airnailerparts dot com
Thanks,
Jeff

Posted on Jan 15, 2010

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Posted on Jan 02, 2017

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Why doesn't the trigger do anything on my NS289000 framing nailer?


Nailer not firing is caused by lack of lubrication in the headvalve (lube with white grease) or driver stuck/bent (make sure driver moves freely) or safety foot not depressing the firing pin on the trigger valve all the way in. Easy to check. Remove the trigger to expose the firing pin. With no nails in gun, connect air and depress the firing pin with finger all the way in. If the gun fires, adjust the safety foot. If the gun does not fire, lube headvalve and check driver piston stuck. Good luck

Dec 03, 2013 | Campbell Hausfeld Ns2890 Framing Nailer...

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Nv45ab won't advance nails


The allen screw/s that you mention are there to plug holes where automatic equipment would normally connect (such as automatic nailing machines) . This is only a plug and should not be driven in too far. I have also seen allen screws installed in the head to repair small crack/s.

Jan 22, 2013 | Hitachi Air Tools & Compressors

1 Answer

Nail gun will not fire a nail each time but only fires correctly ever other time and leaves dimple from the head firing.


Here are a few tests for you to try. You will need a piece of rubber or coiled up old hose.
First open side door and remove nails. Tilt gun head down then up again to check if piston is loose in the cylinder. The piston should stay in top position. If piston drops to bottom of cylinder remove head and replace piston oring or apply some layers of teflon tape under oring to expand oring slightly untill piston stays at top but still can be pushed down cylinder (look at the lower bumper to make sure that it is not cracked or missing pieces, if it is breaking up the pieces can lodge within the air path to the feeded piston). If driver piston now stays at top, connect air to gun and with side door open contact gun to rubber firing gun noticing the feeder movement. With very rapid firing of the gun, the feeder should move back and fourth just as fast as the driver moves. If the feeder seems to move slower than the driver moves then check/replace spring in feeder piston chamber. If spring seems strong enough in your opinion then problem is restriction in the air supply to feeder, if air path is clear then replace orings to feed piston. You will need to remove the two 6m allen screws at front of gun and split gun apart to check restriction at the oring sealing these two parts. Sometimes debris traped at oring (white oring) will restrict air to feeder. Good luck.

Jun 21, 2011 | Stanley Bostitch Nail Gun

1 Answer

Fireing pin moves very slow, it seems to have no power. It comes out slow, I have to push it back inside the gun. It was leaking out the back so I adjusted the cyclinder and now the piston moves too slow...


When you trip the safety and fire the gun, the cylinder drops down into body of gun allowing a rush of air to push piston down with force. If the cylinder fits too tightly in body, it will not open enough to allow full air pressure into cylinder. Remove head and check that the cylinder moves rather easily down then back up (it should travel about 1/4 inch). If is difficult to move the cylinder then remove it and replace all the orings that contact its surface. Also make sure that the outer part of the cylinder is smooth where orings contact. If there are fine scratches, remove them with 400 grit sandpaper. Lube cylinder/orings with silicone paste lube. While cylinder is removed check that lower bumper is in good shape with no missing pieces. For best performance, also replace the three orings on the feed piston. Piston /driver should move down cylinder with only slight pressure yet it should not drop down the cylinder under its own weight. Good luck

Jan 16, 2011 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Bostitch Rn46-1 Nail feed keeps coming dislodged when firing gun


The feeder will dislodge if the feed paw spring is weak or missing. Replace with new spring to keep the feeder paw in place. Visual test with good feed spring. Remove nails and open side door. Fire gun rapidly against hard rubber or coiled air hose. The feeder should move back and fourth in time with the piston/driver. If the feeder seems to move in slow motion compared to the driver, check feeder piston orings and feeder piston spring. If both feeder piston orings and spring are in good condition, then check air passage to feeder piston chamber for obstruction. Sometimes debris will lodge in white oring where body mates to nose of gun. Good luck

Jan 14, 2011 | Stanley Bostitch Rn461 Gun Coil Roofing...

1 Answer

When i squeeze the trigger the gun goes off but no nail comes out? i have already bought the repair kit and have been working on this gun all day


Here are a few tests for you to try. You will need a piece of rubber or coiled up old hose.
First open side door and remove nails. Tilt gun head down then up again to check if piston is loose in the cylinder. The piston should stay in top position. If piston drops to bottom of cylinder replace piston oring or apply some coils of teflon tape under oring to expand oring slightly untill piston stays at top but still can be pushed down cylinder. If piston stays at top connect air to gun and with side door open contact gun to rubber firing gun noticing the feeder movement. With very rapid firing of the gun, the feeder should move back and fourth just as fast as the driver moves. If the feeder seems to move slower than the driver moves then check/replace spring in feeder. If spring seems strong enough in your opinion then problem is restriction in the air supply to feeder. You will need to remove the two 6m allen screws at front of gun and split gun apart to check restriction at the oring sealing these two parts. Sometimes debris traped at oring (white oring) will restrict air to feeder. Good luck.

Jan 08, 2011 | Stanley Factory Reconditioned Bostitch...

1 Answer

I have a Bostitch RN46 Roofing nailer. I bought it used. I first tried it out hooked to a JacPac CO2 system that happened to malfunction at the moment I used it with the roofing nailer. The pressure on the...


The high pressure blew out one or more of your o-rings inside. The drive piston should not move freely in the gun so the o-ring around that is definitely one of them. It's hard to damage the metal and plastic parts of a gun short of dropping one off a roof so rebuilding one by replacing the o-rings is always worth it. You should look for a rebuild kit Part Number: RN46-RK

Nov 16, 2010 | Stanley Bostitch Rn461 Gun Coil Roofing...

1 Answer

Shoots one nail then it stops it fires but no nail


This is a very popular gun, very light and powerful. Skipping nails is not a common problem. Here are a few things to check that would cause the issue. (First remove air hose and nails.) Worn piston oring (piston will be in the down position). Open side door and check that piston is at top. If oring ok, check feed spring under feeder claw. If spring is in place, push feeder in manually. It should be very difficult to move feeder shaft. If it moves easily then spring inside feeder chamber is broken. If ok, connect air to gun, leaving side door open (nails removed) and bump fire gun against hard rubber (or coiled rubber hose ) very rapidly. While bump firing rapidly, look at feeder moving back and forward. It should be moving very quickly keeping up with speed of driver. If it appears to be moving slowly compared to driver there is an air feed restriction to feeder chamber. Check for debris in small air passage to chamber. Remove two allen screws holding nose of gun to body and examine the small white teflon oring between nose and body(part #149885). Sometimes this oring traps dirt and grime or just simply gets pressed so tightly that center hole is restricted. You must use the correct teflon oring here because the nose and body fit so tightly together that a rubber oring will close air path. Good luck.

Sep 18, 2010 | Stanley Factory Reconditioned Bostitch...

1 Answer

As I try to fire the gun, I just get a small thump of air and no nail fires This gun is 2 years old and worked perfectly when I put it away last spring.


Problem you describe is typical of stuck driver or firing valve. Easy to check; remove head and make sure piston moves down cylinder (upon removing head, piston should be at top). Your gun utilizes sliding cylinder instead of moving valve in head. When you pull the trigger the cylinder moves down allowing air pressure to drive piston down. Orings swell overtime which prevents the cylinder from moving/firing. If cylinder does not move down/up, may be time for rebuild kit. Parts are available at dewalt service center or can be ordered from www.toolpartsdirect.com. Good luck

Aug 30, 2010 | Dewalt D51825 Heavy Duty 31 Degree Clipped...

3 Answers

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!

Jul 30, 2009 | RTO Paslode 902000 IM250 Ii Cordless 16...

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