Question about Craftsman 18 ga Brad Nailer Kit 18173

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Will not operate. the nailer is frozen up and soes not operate when the trigger is pulled. I have disassembled it and the head valve piston is stuck up in the head. how do I get it out?

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Take a look at the head where the gasket sets and look for small hole. Apply air pressure to hole and valve should pop out. Be carefull because it may shoot out with force. Examine the plastic valve where the oring fits and check for cracked lip. There should be a spring behind the valve in the head and usually a second oring. Parts are available at searsparts.com. Good luck and post again if you have other question.

Posted on Jul 19, 2010

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I have already changed trigger valve assembly, O rings and all. Still leaks when I try to fire. Will not shoot brads just leaks lots of air around trigger assembly.


Most likely problem is the head valve orings not making perfect seal. Remove the head and pull out the headvalve piston. Apply plenty of white grease to orings and test fire. If gun fires, will need oring kit soon. Good luck

Aug 14, 2015 | Stanley Bostitch SB1850BN 18Gauge Brad...

1 Answer

I have a Bostitch N60FN air nailer that won't fire, I have replaced tva6 and piston stop, I have no air leaks but when I push trigger I get small puff of air from trigger valve but nothing else.


Easy test, remove the trigger to expose the firing pin and remove the nails. With air connected very quickly depress the firing pin all the way in. If the gun fires, the safey foot is not pushing the pin all the way in. Make adjustments to correct. If the gun still does not fire, the headvalve orings are leaking internally. Remove the head and pull out the head valve. Make sure that there are no fine scratches on the surface where the headvalve orings make contact to cylinder in head. If scratched, remove with very fine sandpaper. Remove the large outer headvalve orings and wind a couple of turns of teflon tape in the groove and replace the oring. This will make the oring fit more snuggly against the head. Lube with white grease and test. Good luck

Dec 28, 2012 | Air Tools & Compressors

1 Answer

DeWalt D51822 Framing Nailer: Replaced the trigger valve and air is still coming from the nose of the gun. I would think no air should get past the trigger valve until pressed. What's wrong?


Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer. Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. Good luck with your repair

Jul 05, 2012 | Dewalt Heavy - Duty 31° Clipped Head...

1 Answer

My bostitch n88rh framing nailer will fire when pointed down but wont fire pointed horizontal.


Nailers are made to use in any position so must be something simple to fix. Most likely safety contact foot, to test, remove the nails, remove the trigger to expose the firing button on the trigger valve. Connect air and dry fire onto wood or old coiled rubber hose in various positions. If the gun tests ok then carefully examine safety foot mech. and trigger for loose components missing guide or roll pin. The contact foot must push firmly up on the lever within the trigger thus pushing on the firing button. If the safety foot and trigger are in good conditon and working ok, then problem is within the headvalve and piston orings. To test piston oring, remove airline and nails, point nailer up then down again. The piston should stay in the top position. If the piston moves up /down with movement of gun, replace piston oring. If piston oring ok, remove the head and pull out the headvalve. Apply plenty of silicone paste or white grease to orings on headvalve and reinstall and test. If tests ok, then problem is worn orings in the head /headvalve. You can keep lubing or replace orings. Examine the surface within the head where headvalve orings make contact. If there are many fine scratches, even new orings will not work very well. Try to remove scratches with very fine sandpaper. Good luck

Apr 29, 2012 | Stanley Bostitch N88rh Framing Nailer...

1 Answer

Nail gun wont drive nails..just makes a weak popping sound


Popping sound indicates stuck driver or worn trigger valve. Remove the head and pull out the driver. The driver should fit snugly in the cylinder. Replace the piston oring if the drrver drops down the cylinder under its own weight. Check for bent or broken driver and replace as needed. Lube cylinder with silicone paste lube or nail gun oil. Check that the headvalve is not stuck in the head and lube as needed. Replace head and test. If no joy, replace the trigger valve. Good luck.

Aug 21, 2011 | Stanley Bostitch Stick Framing Nailer...

1 Answer

The nailer just makes a plopping sound when I pull the trigger. and nothing happens?


This usually indicates a stuck driver or stuck (or worn orings in) headvalve. Pull off head and take a look at the driver. Make sure that it moves in cylinder and does not just drop down tube (bad piston oring). If piston/driver ok remove headvalve and look for fine scratches where orings contact head. If scratched sand with 400 grit paper till smooth and lube with silicone paste (sold at lowes in the plumbing department). Parts are at www.toolpartsdirect.com

Nov 02, 2010 | Stanley Air Tools & Compressors

1 Answer

Hi, i got a hitachi nv45ab and My nailer leaks air out the back


Hitachi nv45 series is the most popular line of nailers amoung professional roofers. There are three areas that develop leakes. Leak out head vent indicates cylinder stuck in lower position or headvalve worn. With air connected, gently rap head of gun against rubber mat to move cylinder to position. (Use caution not to damage head). If this action works, gun needs cleaning internally or lack of oil. If air still leaks out vent remove head and examine valve in head and replace as needed. Check that cylinder moves freely up/down (travel aprox 1/4"). If cylinder is hard to move pull cylinder and clean replacing orings as needed. If leaking around trigger, remove rollpin and trigger and check nylon ball for pits and replace as needed. If leaking around base of gun check for loose bolts and/or worn gaskets. Remove nail canaster to check feed piston gasket and screws. Good luck with your repair and post again if you have other question.

Aug 04, 2010 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Piston drives down when hooked up to air...piston does not return up. is this a problem with the triger valve? I am not pulling the triger, just hooking up the air. This gun hasnt been used in 10 years,...


Sounds like the head valve is stuck in the head. Take black head off and see if the valve is spring loaded by pushing down and see if it comes up. This is the usual problem.

Jul 08, 2009 | Stanley Bostitch N80CB Coil Framing Nailer

2 Answers

CRAFTSMAN NAILER


I had the same issue with an older craftsman 351-18309 brad nailer and crown stapler. When I pulled off the top of the piston, there was a denigrated o-ring. I took an ear bud for my Bluetooth headset, cut it to size and stretched it to prevent it from holding the spring... And I'll be damned it worked! It both tools!!
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Dec 06, 2008 | Air Tools & Compressors

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