Question about Senco SNS41 16Ga Stapler 1" 2"

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Sfn1 My driver won,t retract. I tried lots of things to fix it. I noticed the second oring on the plastic cylinder does not fit to anything. Is some part missing?

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Go to this site it will give you a break down of this tool .

Posted on May 30, 2009


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Drive pin does'nt retract

Reasons for driver not retracting./
Check band on the outer part of the cylinder missing or not in place. Pull out cylinder and look for series of holes. These holes should be covered with rubber band or oring. The band/oring should fit snuggly.
Driver slightly bent making it hard to push driver up. Push driver up with any tool that fits into the nose. Should move up rather easily. If hard, pull driver and check for damage or oring too tight/loose.
Too much air leaking past the nose due to worn lower bumper. Bumper should not have cracks or missing pieces. Some nailers use a second seal below the bumper made of metal or vinyl. If broken or missing, replace. Finally, piston will not retract of there is an obstruction in the headvalve exhaust port. Good luck

Dec 17, 2013 | Tools & Hardware - Others

1 Answer

Driver pin will not retract on its own. Can be pushed back easily by hand.

You did not mention a model number, however, many nailers have a check valve that returns the driver to top of cylinder. It is in the form of an oring or band like rubber band. It is usually installed around the outside of the cylinder covering a series of holes. Remove the head and pull out the cylinder. Look for series of very small holes drilled into the cylinder. These holes should be covered with snug fitting band or oring/s. There will usually be an indention or groove where the oring will sit. Use any rubber or oring that will fit snuggly. If band or oring is in place, then piston/driver oring is too loose or obstruction in the discharge port up in the head. Good luck

Aug 12, 2013 | Air Tools & Compressors

1 Answer

Senco nailgun sn4 plunger doesn't retract

The driver will not retract if the driver is bent, piston oring too loose or too tight or the check band is loose or missing. Easy test, remove air and push the piston to top of cylinder. It should move up with very little effort. If hard to push, oring too tight or driver bent. If piston moves too easily and drops back down under its own weigth, oring too loose. If easy to push and stays suspect check band (check band is located on the outer lower part of the cylinder. Looks like black rubber band or series of orings that fit over series of holes. ). If the band is split or broken, replace with series of orings to cover all holes, or use any rubber like bicycle tube. Good luck with your repair.

Sep 28, 2012 | Air Tools & Compressors

1 Answer

I have a sfn1 senco nailer the drive pin does not retract after firing

take off cap of tool remove wagon wheel. remove cylinder and driver on outside of cylinder there are two orings a large one and a small one / it might a band instead of an oring if tool is older. there should be bunch of tiny holes your oring/band is worn or missing its called a return band

Apr 17, 2012 | Senco Air Tools & Compressors

1 Answer

The piston won`t retract in order to load the next nail.

Piston not retracting is caused by several issues including bent driver blade, piston oring too worn, or check band on the outer part of the cylinder broken / out of place. Easy to check. Remove the head and pull the driver. Examine driver for bend. If not bent insert driver into cylinder and check for worn oring. The driver/oring should fit snugly and driver should hold in position in the cylinder without sliding down the cylinder under its own weight. Examine the lower bumper for missing pieces or cracked. Replace as needed. If driver /oring and bumper are ok, pull out the cylinder and examine the check band. Black piece of rubber covering series of small holes. Should fig snugly on cylinder, replace as needed. Repair kit does not include the lower bumper or the checkband. Good luck with your repair.

May 30, 2011 | Dewalt D51850 Heavy Duty 20 Degree Full...

1 Answer

The drive pin does not retract, the nailer will push but not retract.

The driver will not retract if it is bent or if the checkseal on the outer part of cylinder is broken. Remove head and examine driver. Repair or replace as needed. If driver is ok, pull cylinder and examine rubber checkseal. It should be installed snugly around series of holes on outside of cylinder. If checkseal fits loose or broken you can use a series of orings to fill space(about 3 to 4 orings). Good luck

Jan 29, 2011 | Porter Cable-Cable FN250C 1-inch...

1 Answer

Stanley Bostitch N89C-Piston will not retract. Forgot to oil today-used ,yesterday and today, perhaps 200 nails. If I have to disassemble do I open from top or bottom?

Lack of oil usually will not prevent driver from retracting (bent driver /debris / worn piston oring / cracked lower bumper / loose check valve ) . Remove nails and push driver up. It should not require much force to move driver / nor be so easy that driver fall back down under its own weight. If driver feels loose, replace piston oring. If it feels about right, most likely problem is the check valve. Remove head and pull cylinder. Look for band around cylinder covering series of holes. It should fit snuggly. If loose replace with new part or use any rubber available or series or orings to fit space. If check seal looks ok then examine lower bumper for missing pieces or cracked. Lube with silicone paste lube sold at Lowes. Parts are available at . Good holidays

Dec 28, 2010 | Stanley Bostitch N88rh Framing Nailer...

1 Answer

Hammer doesn't retract

Assuming there is no air leaking from the gun, the check seal (part #175520) causes piston to retract. It is a band that fits around the cylinder and covers vent holes in cylinder. You can use orings in place of band (or be creative). Other reasons for piston not returning to top include bent driver, worn piston oring, or cylinder/ oring lacking oil. Good luck

Sep 04, 2010 | Stanley Bostitch F28WWMCN 28° Industrial...

1 Answer

Senco SFN1 wont work

I have worked on many sfn1 with the problem that you describe. Here are a few things to check. Driver/piston too tight or too loose in cylinder or bent. It should be relatively easy to move the driver piston up/down the cylinder. Usually it should hold it's own weight and not drop down the cylinder. There is a washer that should be at the bottom of the gun under the bumper (washer part# bf0070). This washer must not be worn to the point that too much air will leak past or missing. Finally there is an oring that controlls return of piston (part # lb0077). Pull out the cylinder and find it located on the outer part of the cylinder close to bottom. Clean the port holes under the oring and make sure that the oring fits snuggly. Do not use oil in this gun. Oil will swell the rubber parts. I use silicone lube available form Lowes in the plumbing department. The grease is used to lube faucet orings. Good luck with your repair and email if you have questions.

Mar 16, 2009 | Senco SNS41 16Ga Stapler 1" 2"

2 Answers

Senco finish nailer, drive pin doesn't retract up to take another nail...

Senco nailers are very reliable however could suffer from several issues that would cause your problem. Here are a few things to check that may solve your problem. Bent driver, worn parts, broken check valve. Main problem with all finish nailers is bent driver blade. Easy to check, remove and examine. The driver should travel length of cylinder without jaming. Driver oring/plastic ring should fit snug into cylinder. Remove cylinder and check the oring neer the bottom of the cylinder. This is a check valve. There are small holes that should be cleaned. If oring is loose or broken just use any oring that fits snuggly. Next, check that lower bumper is not chipped or cracked and that washer under bumper is not too worn or missing. Replace parts as necessary. (

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