Question about Senco 4D0001N Framepro 502 Framing Nailer

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Senco sn4 will not return piston to top - Senco 4D0001N Framepro 502 Framing Nailer

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Posted on Jan 02, 2017

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sbg_ofp
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SOURCE: senco

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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rowdy45176
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SOURCE: Senco SN4 nailer not feeding

ther isn't a spring, it works on air to pull the driver back up. Have you tried oiling the tool as recommended (about 6 drops a day) If not then you have a problem with either o rings that are dried out or worn so they cannot keep the suction required for the tool to operate properly. Might also be a bent driver (doubtful). Go to Senco.com and type in your model number and they list rebuild kits for this tool. If you need more assistance let me know and if I have helped with your request would you please rate this accordingly.

Posted on Sep 12, 2009

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1 Answer

Sn4 drives nails too deep


Proberbly the bump stop needs replacing here, the reference is BB0018 but as this is a discontinued tool, you may have difficulty finding one.

Apr 02, 2014 | Senco Tools & Hardware - Others

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 Senco Frame Pro framing nailer. The plunger is sticking in the


Check the drive pin for burrs and file them off. Check for worn piston replace if necessary. Clean the air return hole in the top of the piston cover. Add oil if manufacturer recommends it.

Mar 24, 2012 | Senco Air Tools & Compressors

2 Answers

Senco nail gun sfn30 is only firing every second nail in


You have damaged o-rings in the gun. Remove the head cap & valve assembly, remove the ring on top of the cylinder, remove the cylinder & piston. The cylinder is in tight so work it out carefully. Check the condition of the following: a split flat ring with a rubber o-ring under it on the top of the piston and two o-rings on the outside of the cylinder. If these are damaged air will leak around the piston instead of pushing it back up. The inside of the gun should be clean with a light coat of oil on everything if you are oiling it properly before use. Dirt in the gun means the gun is being laid on the ground without the air hose attached. Dry innards means no or not enough oil is being put in the gun before use. Oil pooled in the bottom of the gun means too much oil is being used. Senco doesn't make a rebuild kit for this gun, you'll have to go to the Senco website http://www.senco.com/ or other website like http://www.ereplacementparts.com to get a parts breakdown of your gun and order the o-rings (any part beginning with LB) individually. If you replace one, replace all of them and grease them up liberally when reassembling the gun.

Jan 29, 2012 | Senco Tools & Hardware - Others

1 Answer

I have seen many nails that supposedly fit the senco sn4 nail gun. Some are 31 degree, some are 33 degree. All have paper collating. What angle nails should I search for to fit the senco sn4?


Senco uses 33 degree paper tape clip head, however many generic brands will label their box 30-34 degree to fit several nailers. This practice causes jams in some guns and others work fine. The goal is to save money but could cost more in the long run if gun is damaged. You can use generic (other than 33) if you take a strip of nails and place them against the outside of the rails aligned with either the line of driver path of angle of the rails. This will give you a visual as to the alignment. Best result is when the complete nail is in line with the path of driver. Next best result is when the head is in the path of driver and point of nail is slightly away from path, worst is when point hits path and head is back. Good luck

Mar 26, 2011 | Senco Air Tools & Compressors

1 Answer

I have an SN4 and an SCN49 both units i have cleaned, replaced all orings and relubed (lightly) and yet the striker on both these units will firer then will not return???? i would really like an air flow...


With piston in lower position push piston up quickly with any tool that fits from bottom (sn4). You should hear air discharge from head and it should not be very difficult to push up. If it seems ok, then pull cylinder and check that orings are snugly in place at grooves near bottom outside of cylinder (the grooves have holes and should be clean of debris). If orings are in place at outside bottom of cylinder then most likely problem is headvalve / exhaust valve not allowing air to discharge.

Feb 16, 2011 | Senco Air Tools & Compressors

3 Answers

I just rebuilt my Senco SN4 nail gun because it leaked air.


I think that you are referring to the firing valve and no it should not be split. I suggest going to Senco.com and typing in your model number fora breakdown for this tool. They offer different kits for various failures. Let me know if you need more help

Nov 23, 2009 | Tools & Hardware - Others

1 Answer

Senco SN4 nailer not feeding


ther isn't a spring, it works on air to pull the driver back up. Have you tried oiling the tool as recommended (about 6 drops a day) If not then you have a problem with either o rings that are dried out or worn so they cannot keep the suction required for the tool to operate properly. Might also be a bent driver (doubtful). Go to Senco.com and type in your model number and they list rebuild kits for this tool. If you need more assistance let me know and if I have helped with your request would you please rate this accordingly.

Sep 11, 2009 | Senco Air Tools & Compressors

1 Answer

Senco SN4 misfiring intermittently


This is a discontinued tool by Senco but there are still parts available for it. It sound to me that the o rings and possibly the firing valve need to be replaced. I would recommend going to Senco.com and you will find a complete parts diagram in their discontinued tool section. They also have a toll free number if needed and you can talk to their air pro. I have rebuilt quite a few of these and they are not that hard just make sure to clean all the parts and use lube when replacing O rings.

Jan 01, 2009 | Tools & Hardware - Others

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