problems with bostitch N79RH-1 Nailer

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  #1  
Old 10-26-03, 09:41 AM
trance's Avatar
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problems with bostitch N79RH-1 Nailer

Hi,

I have a Bostitch N79RH-1 framing nailer. This is a large nailer,
with 22.5 degree stick nails, not clipped head. I bought
it second hand on ebay.

the trouble is that it does not drive the nails in all the way.
it will drive the first nail (at over 100 psi) and maybe the
second, but the remainder of the nails barely go in, even
though the pressure is plenty high.

I have read the owners manual which suggests adjusting
the "work contacting element" (toothed head that you push
against the wood to allow the nailer to work). I have adjusted
this for maximum penetration.

Bostitch also recommends that you use a 3/8" air hose and
fittings. My air hose has an OUTER diameter of 3/4" and
the fittings have an INNER diameter of 3/16"

Not sure if that's the problem.

Can anyone help? If this tool needs a rebuild, can someone
tell me where I go to either get the kit or get it rebuilt?

thanks.
 
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  #2  
Old 10-26-03, 10:29 AM
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trance:

To eliminate problems with the air supply you must troubleshoot that first.
To know if you are starving the gun of air you will have to install a pressure guage at the gun.
Industrial suppliers sell these made up for setting the pressure on paint sprayers.
After driving a few nails it will be easy to see if your equipment is overtaxing your air supply. You should have at least 90 psi available at the gun to give full driving force.
Another thing to check is if the compressor can maintain that same 90 psi minimum while the gun is in use.

By your description it sounds as if you have a 1/4" hose but don't say how long it is.
Most air tools come with 1/4" pipe threads and if you buy a hose to fit it will most likely be 1/4" ID.
3/8" hoses with 1/4" fittings are readily available but you have to read the package to be sure.
 
  #3  
Old 10-26-03, 11:40 AM
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Are you oiling it properly?
 
  #4  
Old 10-26-03, 11:57 AM
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chfite -

i am not oiling it (not using it much either) as I don't
know what kind of oil or where to get it.

I'm going to try a larger hose and fittings & if I can
find the oil too...

thanks...
 
  #5  
Old 10-26-03, 03:32 PM
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If you aren't oiling it you won't get the seal you need for the gun to work right. This is like the engine oil in the cylinders of your car, the oil completes the seal. Not oiling the gun will ruin it by eating away the cylinder or the o-rings. The oil serves as a lubricant as well as a sealant. You should oil the gun with the oil for air nailer, two drops before you start. Oil it whether you drive one fastener or 100. You can buy this oil wherever air guns are sold, even HD and lowes.

Hope this helps.
 
  #6  
Old 10-31-03, 08:08 AM
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Also, for about $8 you can buy an automatic oiler that screws into the air intake port on the nailer. The hose then plugs into the oiler. You fill the auto oiler with oil and keep on firin' until the oil is gone, then refill it.
 
  #7  
Old 10-31-03, 08:14 AM
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Ok,

I oiled the heck out of it, and got larger (3/8") air fittings.

while the oil helps (the gun does not hiss now) it still
does not drive the nails all the way. now it will do maybe
2 or 3 well, then the rest have to be finished by hand.

the owner's manual says the gun will run between 100 and 85
psi - it seems to me it needs 110 ---

now, I expect the gun won't necessarily get a nail through
the 130 year old wood studs in my house, but this one
is even having trouble going through 1 layer of brand new
2 x 4....

sigh...
 
  #8  
Old 10-31-03, 08:27 AM
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May be time to carry it to the shop and have them look at it.
 
  #9  
Old 10-31-03, 08:28 AM
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yep. that's what i'm thinking too.
 
  #10  
Old 10-31-03, 10:52 AM
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Troubleshooting

trance:

Have you confirmed that you have the required pressure consistantly AT THE GUN when it won't drive the nails?
This is the only way you can narrow down the problem yourself.

You can take the gun in to be checked.
If you take them the gun with a strip of nails and a piece of wood that you are having trouble driving nails into, they can plug it in to a good air supply and know pretty quick how it's performing...............or, install the guage at the gun and diagnose it yourself.

BTW: If the regulator is set to 110 psi at the tank to make it work, too high a pressure drop due to a small hose could be part of your problem.
 

Last edited by GregH; 10-31-03 at 11:36 AM.
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