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Senco stapler piston will not return & the bumper is like new

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Not much to go on there. As the plunger makes it's attempt to return, is there an increase in exhaust pressure? What I'm getting at is that there should be 2 sets of O rings. One for downward force and one for upward. Are both sets sealed tight? Are they lubed porperly? Could the cylinder wall from which the plunger functions be warped or defected in anyway? I'm just throwing this one out there so please don't be offended...Are the O rings the proper size?

Posted on Nov 05, 2008

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If you've had and used the gun since 1998 and never rebuilt it, it's done you well indeed. If the driver is not retracting you most likely have broken or worn o-rings inside the cylinder. Senco makes a rebuild kit, part number YK0376. that contains all o-rings and wear items inside the gun. The kits run about $60 but your gun will be like new again. It's a relatively easy rebuild, just use lots of the Senco grease on the o-rings as you reassemble it.

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1 Answer

Model SHBN4. Piston does not withdraw after actuating to allow nail to come into position to be fired.

Piston does not return to top is caused by bent driver, worn lower bumper missing check valve or worn piston oring. Remove the head and pull out the cylinder and driver. Check the driver for bent shaft and that the piston/oring fits snugly into cylinder; make adjustment as needed. The lower bumper should not be cracked or missing pieces. Below the bumper is a seal that should fit snugly around the driver blade. Most all nailers have a check valve around the outer lower part of the cylinder. Could be oring or look like rubber band. This checkvalve will fit snugly over a series of holes cut into cylinder and causes the piston to return to top (not all nailers have this checkvalve). Lube all parts with silicone paste lube or nailer oil. Good luck

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1 Answer

My Senco SFN1 finish nailer will not shoot a nail. When the trigger is pulled air comes out but no nail is shot. Thanks,Steve L

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1 Answer

My driver doesn't come back far enough to pick up the next nail

Many causes for this problem. Some things to check. Push the driver up by hand to see if it moves easily /hard. If hard, check for bent driver or dry cylinder. If it moves easily, check piston oring too worn and /or air could be leaking down past the bumper area. Most guns have very close fitting bumper or a seal below bumper. If too much air leaks down past bumper driver will not return fully. Check seal could be loose or broken. Remove cylinder and look for check seal covering a row of holes on outer/mid to lower part of cylinder. could be a band or oring and should fit rather tight. If ok only other parts to check are the headvalve and piston stop. Piston stop should not have cracks or missing pieces (piston stop slows/stops piston when it returns to top). Head valve should be well lubed. Good luck

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1 Answer

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1 Answer

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