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Should I buy the Hitachi NR90AD? - Hitachi Tools & Hardware - Others

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1 Answer

Air blowing out the triger


Time for an overhaul. There are seals on the unit that are either worn or blown out.

Aug 10, 2012 | Hitachi NR90AD 3 - 1/2'' Clipped Head...

1 Answer

Bought hitachi nr90ad nail gun and it isn't firing right..what exact size nails should i get ( as in 35,33,or 30 degree nails)


Use 34 degree, paper collated, clipped head nails. They were always the most common strip nails years ago as Senco, Paslode, and a number of other nailers used them.

Jul 25, 2011 | Hitachi NR90AD 3 - 1/2'' Clipped Head...

1 Answer

Nail gun will not fire the nail. Compressor works fine. Hammer doesn't retract enough to hit nail? Cause, solution?


could be a jammed nail in the magazine nose area, bent driver blade or problem with the o ring being worn.

Jun 06, 2011 | Hitachi NR90AD 3 - 1/2'' Clipped Head...

1 Answer

My older style Hitachi NR90AD still works OK but always leaks a little air out of the very top of gun. I took the head off, cleaned, and oiled but still leaks by.


Over time debris enters the gun and scratches the metal and plastic surfaces where orings seal against. These scratches will allow air to leak past. Remove the head and pull out the head valve. Examine the metal surface with magnify glass where the headvalve oring makes contact. Remove scratches with 400 grit paper. The surface must be smooth and the oring must seal snugly. Apply silicone paste lube on all surfaces and orings (available at Lowes in the plumbing department and swimming pool supply). Also check for scratches around the body of the gun were the cylinder plate is installed around the cylinder. The gun will not work properly will small air leaks. Remove nails and listen for leaks thru the nose of the gun. Repair as needed. Good luck with your gun.

May 24, 2011 | Hitachi NR90AD 3 - 1/2'' Clipped Head...

1 Answer

Hitachi na90ad leaking from rear and from front where in nail comes out from still fires ok


the seals are wearing out, this is normal ageing, you can buy replacement "0" rings and put them in quite easily

Mar 21, 2011 | Hitachi Nr90ad Framing Nailer Oring Parts...

1 Answer

Air is continually running but no presssure is building up so the drive pin never resets in order to shoot the nail


Remove head and check seal between headvalve and cylinder. If seal looks good, just remove head parts and clean/lube. Also clean/lube orings between cylinder and body of gun.

Sep 23, 2010 | Hitachi NR90AD 3 - 1/2'' Clipped Head...

1 Answer

What is the angle of the nail we use with this nailer


if thats a hitachi nr90ad, then you should be using 30 degree paper taped clipped headed nails,, never use plastic or wire collated nails in that gun,, some boxes might say 30 up to 34 degree and thats fine, also in a lot of areas clipped headed nails are no longer code, so they made the nails full headed, the head is just off set,,

Dec 04, 2009 | Hitachi NR90AD 3 - 1/2'' Clipped Head...

1 Answer

Nails were installed backwards by accident - now a nail is stuck in the head - how do you get it out?


start by removing all of the screws that hold the track on and remove the track

open the nose piece and you should be able to grab the nail with needle nose pliers

Sep 23, 2009 | Hitachi NR90AD 3 - 1/2'' Clipped Head...

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