Question about Stanley Bostitch Rn461 Gun Coil Roofing Nailer

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Hitachi nv 65ah coil nailer plunger won't advance

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Posted on Jan 02, 2017

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comax
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SOURCE: N80CB - Coil Framing Nailer firing plunger stuck

There is a number of reasons that this will happen. Is the driver (plunger) physically stuck? Take a small screw driver and see if it can manually be pushed back. It may also be a broken head valve spring, or a stuck head valve (you have to remove the rear cap to get to these parts) Maybe this unit just needs an O-ring kit. Try these things and let me know

Posted on Apr 14, 2009

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H2_Brad
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SOURCE: My Bostitch N12 won't advance nails

It could be the o-rings for the feed piston but a bad feed spring will also cause problems. that would be the easiest place to try if you can find a spring. Many of the parts for these are becoming NLA (no longer available) from Bostitch. One problem they had in the feed piston area was chipping the nose where the orign seals the piston stem. There is a small bumper on the inside of the feed piston cap that goes bad and allows the piston to travel to far back which slams the feeder against the lower housing and can chip it where the piston goes through.

Posted on May 18, 2012

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1 Answer

Hitachi 45ab blowing air out of trigger


If air leaks thru trigger as soon as you connect airline, replace the vinyl ball under the trigger stem. If air leaks when you depress the trigger, replace the small oring on the trigger stem. If air leaks slightly from plunger in front of the trigger valve, problem is inside of the gun. Remove the head and pull the large circular plate. Replace the large outer oring. Good luck

Feb 10, 2014 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

My Hitachi NV45AB is leaking air from the trigger air valve. The gun still works if I just keep the trigger depressed and just smack the tip into the shingle.


Remove the 3mm roll pin holding the trigger in place and set aside the trigger plunger (white plastic plunger should have an oring on groove). Remove the fitting that holds the trigger plunger and replace vinyl ball #875645 or check for debris under ball. Good luck with your repair.

Apr 19, 2013 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

My hitachi nail gun NV 50AA will fire, but won't advance the nails on a regular basis


NV50 nailer is very difficult to repair due to complicated feeder /feeder spring / feeder retainer pin design. You most likely need to replace the orings on the feeder piston. Problem is that you must remove the feed pin/ spring to get the piston out. If you are going to attempt to replace the orings, study how the pin is installed otherwise you will make it worse. Order new springs (2 different springs ) and install them when you are going back together. Good luck

Mar 03, 2013 | Tools & Hardware - Others

1 Answer

Why won't feed plunger advance nails?


The two hex head screws on the very top of the head hold the air deflector and attach to the headvalve (the part inside the head with rubber coating, this headvalve has a gasket under that should be check for proper alignment ). Other small screws that look like set screw are only plugs that are removed to install auto control hoses in factory work. These are only plugs so just put them in a few turns with locktite.

Jan 23, 2013 | Hitachi Tools & Hardware - Others

2 Answers

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

Hitachi NV45AB won't advance nails


This problem could be caused by the head gasket fliped the wrong way not sealing small hole in the body. Also the head valve gasket (small round gasket between headvalve and head) could be place with vent hole mis-aligned. Check these two items and post again.

Jan 22, 2013 | Air Tools & Compressors

1 Answer

Leak air for the trigger


Could be leaking from trigger or in front of trigger at plunger. Spray soapy water on area and determing exact leak. If from trigger pin, remove pin holding metal trigger (3mm roll pin) and check white plastic plunger for oring on groove. If oring is in place then check vinyl ball inside trigger valve bushing. Replace as needed. If leak is in front of trigger at black boot, remove head and replace oring on outer part of cylinder plate (donut shaped plate at top). Good luck

Mar 01, 2011 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

My hitachi nv45ab double fires


Your nailer has two adjustments that could be the problem. One is just up from the door hinge. You will see a thumb wheel. Turn the wheel till the safety can move all the way up. Next adjust the screw below the trigger plunger by backing off the locknut and turning the 5mm bolt up or down a few turns into a different position. This is the depth adjuster. Most operators bump fire this nailer. Good luck

Oct 21, 2010 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

I just rebuilt the nail gun with all new o-rings and gaskets and when I put the air to it air actually blows the rubber boot off the plunger on the trigger assy.


I am assuming that the boot is blown off when your fire the nailer. This is caused by a loose/worn plunger and valve. If the plunger moves from side to side too much air will flow past the valve and blow off the boot. Most used hitachi nailers will blow this boot. Only way to fix is replace one or both parts. If air leaks past the boot immediately when you connect to air, check oring on plunger A (part# 874-820) or outer orings on cylinder guide and cylinder plate. These outer orings are easy cut while inserting these parts into cylinder. Check orings for nicks. Good luck and post again if you have more questions.

Mar 11, 2010 | Hitachi NV45AB2S Coil Roofing Nailer

1 Answer

Hitachi VH650 nailer throws air, plunger does not return after firing???


your air rings in the housing are shot cheap parts labor not bad shop around

Mar 07, 2009 | Hitachi VH650 2 1/2" Full Head Fencing...

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