Question about Stanley Bostitch Mcn150 Strapshot Metal Connector Nailer

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MCN150 Will not lift head valve to fire it - Stanley Bostitch Mcn150 Strapshot Metal Connector Nailer

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Posted on Jan 02, 2017

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SOURCE: head valve seems to stick

#1 If the gun only releases air from the trigger and does not fire, suspect orings on Headvalve leaking. Easy to check, remove head and Headvalve and examine the surface in head where oring makes contact with metal surface. If the metal surface looks worn / fine scratches, air is leaking past and gun will not fire. Remove fine scratches with 400 grit paper. Headvalve oring must seal or gun will not fire. If the Headvalve does not make tight seal with new oring, remove new oring and wrap some teflon tape into groove and reinstall oring. The teflon tape will make the oring fit tight against metal surface (try 1 1/2 loops of tape).
#2 If the gun fires however the headvalve gets stuck in the head after some use, Headvalve spring could be weak. Replace the spring or remove the spring and add spacer below spring to give more pressure (I use oring with same diameter as spring under the spring ).
Use silicone paste lube on all orings and surface where orings make contact. This paste is sold at Lowes in the plumbing department and swimming pool supplies. When you connect air to the gun, listen carefully for leaks out the nose or head. Slight leaks will affect how the gun works. Repair as needed. Good luck with your repair.

Posted on May 27, 2011

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This problem occurs when the orings in the headvalve and/or trigger valve are worn or just needs lubrication. This also happens when the safety foot does not push the trigger valve all the way in. Easy test. Remove nails and air pressure. Remove the trigger exposing the firing pin on the trigger valve. Connect air and with a very quick motion, depress the firing pin all the way in. If the gun fires adjust the safety foot. If the gun does not fire, remove the head and pull out the head valve. Lube orings in head with plenty of white grease. Reinstall head and test. If the gun fires, time for oring kit or just keep applying grease. If the gun still does not fire, most likely problem is trigger valve orings. Good luck

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Most likely worn orings in the trigger valve (# TVA14). Cold weather usually does not affect the gun, however using wrong oil would. Replace the trigger valve and /or try using power steering or brake fluid as lubricant for your gun during cold weather and regular nailer oil during warm weather as these other fluids may have a long term effect on the orings (cause them to swell slightly). You can test the other fluids for long term effect by placing an old oring in a cap full of oil for a week or so. I use two orings of the same size, one for control to compare against the one in the oil. No big deal. Also check for worn parts in the safety foot and /or worn trigger. If you have a single shot trigger (light color plastic) try using the bump fire trigger. Good luck.

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If the trigger is set to single fire, you will need to place the gun against the work then pull trigger as you have done. Try setting the trigger to bump fire and try again. If hear a thump inside the gun, remove the head and check that the head valve in not stuck from lack of lubrication. Easy test, remove the nails, remove trigger pin, remove trigger and manually push trigger firing valve. If the gun fires then suspect faulty trigger or safety arm not lifting enought to activate the trigger valve. Good luck

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1 Answer

Pull the trigger, no nail, only continuos air until I release tyhe trigger. not jammed, gun is clean, very new. acted that way right out of the box then it worked and then not and so on, worked...


Safety foot and lever inside of trigger are not pushing the trigger pin all the way in. To verifty that the gun will fire, remove the nails to allow for dry fire. Remove the trigger to reveal the trigger valve. Hold the gun against old coiled rubber hose or soft wood. Very quickly depress the trigger pin all the way in. If the gun fires, adjust safety foot and trigger so that the trigger pin is fully depressed when your bump fire. If the gun will not fire after adjustment, remove the head and lube headvalve/orings with silicone paste lube.

Sep 03, 2011 | Stanley Bostitch Mcn150 Strapshot Metal...

1 Answer

Head valve seems to stick during firing of the tool All new part in tool I have 5 tools with same problem mcn150


#1 If the gun only releases air from the trigger and does not fire, suspect orings on Headvalve leaking. Easy to check, remove head and Headvalve and examine the surface in head where oring makes contact with metal surface. If the metal surface looks worn / fine scratches, air is leaking past and gun will not fire. Remove fine scratches with 400 grit paper. Headvalve oring must seal or gun will not fire. If the Headvalve does not make tight seal with new oring, remove new oring and wrap some teflon tape into groove and reinstall oring. The teflon tape will make the oring fit tight against metal surface (try 1 1/2 loops of tape).
#2 If the gun fires however the headvalve gets stuck in the head after some use, Headvalve spring could be weak. Replace the spring or remove the spring and add spacer below spring to give more pressure (I use oring with same diameter as spring under the spring ).
Use silicone paste lube on all orings and surface where orings make contact. This paste is sold at Lowes in the plumbing department and swimming pool supplies. When you connect air to the gun, listen carefully for leaks out the nose or head. Slight leaks will affect how the gun works. Repair as needed. Good luck with your repair.

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