Question about Stanley Bostitch MIIIFN Flooring Nailers
Most likely the piston (#15) has partially unthreaded from the piston stem (#17) - this requires a complete teardown to rectify. Sometimes it is simply because use has caused it to loosen - it can also be because the piston has stripped.
Also check your bumper - if it is worn, or in pieces the driver will overdrive.
Posted on Apr 17, 2014
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Posted on Jan 02, 2017
SOURCE: bostich gun problem
If the piston/driver is broken, the gun will fire however nailing will not take place because the piston will jam in the cylinder. Sometimes the cylinder will also crack when the driver goes. If the piston is not broken but stays down, then check the cylinder check valve, worn lower bumper, bent driver or cracked cylinder. 18 guage nailer has a very thin driver which will easily bend or break. Parts however are not expensive.
Posted on Nov 25, 2008
Either the pioston backed off piston stem or the blade is broken. remove 4 bolts holding shoe to yellow body. remove magazine and shoe. remove yellow bumper inside gun. Pull piston down and inspect blade. if not broken see if piston backed off stem. if so gun must be rebuilt and part # BC347 must be replaced. visit www.bostitch.com and download schematic and where parts can be obtained.
Posted on Feb 14, 2009
Hello. I can help you. The nail gun you have uses 18 gauge brads. I would use only original Bostitch 18 gauge.
The one MM of difference you mention is the reason why you do not have the pressure you did have. Get rid of those 31MM brads and get the 18 gauge. Home Depot carries the Bostitch line. I would go there or to homedepot.com
Posted on May 20, 2009
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