Question about Stanley Bostitch Mcn150 Strapshot Metal Connector Nailer
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Posted on Jan 02, 2017
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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