Question about Senco Fastening Systems No.43OOO1N SLP20 Brad Nailer/Case

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Slp20 As soon as I plug into air hose, air leaks through top of gun. I replaced complete top end of gun and it got worse.

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By replace I take you mean o rings? If so I would look to see if one got pinched upon reassenbly. If not let me know exactly what you replaced and I will look at a breakdown and see if I can help.

Posted on Jan 27, 2009

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Duo-Fast Ms7664-2


Hi Chuck:
Usually these guns are really reliable provided they are cleaned occasionally and oiled regularly.
I'd start by disconnecting it from the air supply and dis-mantling it, cleaning the bits, and then re-assemble and oil the moving parts at the same time.
Other choices are:
1) Take it to service shop
2) buy another gun.

Oct 09, 2015 | Air Tools & Compressors

1 Answer

Dewalt D51844. Framing out a wall today and the gun worked fine on the first wall. I was starting the second wall and heard an air leak coming from the gun. Would not stop. Tried several things and...


Most all of my guns are senco and the head has the moving part for fire and reload,, controlling the driver piston. Multiple shots suggests a trigger problem. No water in system right.. Well Its all O rings little ones,, skinny ones,, fat ones etc. You can open it up and check, do the head first, I think.. Its fast a off and on

Jul 15, 2012 | Dewalt D51844 Framing Nailer

1 Answer

Air leaks when triggered and no nail


Make sure no nails in gun. With air connected listen for leaking thru nose of the gun also. If leaking thru nose slightly, air is getting past the cylinder seal oring and/or top of cyl is not seating against headvalve. Repair leak to nose of gun before trying to fix head leak. With no air leaking thru nose of gun, add plenty of white grease to orings in the head (one oring at a time) to see if leak is less and/or grease will streak behind the leaking oring. Then repair as needed. May need slightly thicker oring or sand surface where oring makes contact to remove scratches that are allowing air to pass. Also air can enter the head thru the small port in the gasket leading to the head (make sure that the gasket is sealing).

Nov 05, 2011 | Campbell Hausfeld 2-in 18 Gauge Brad...

1 Answer

Gun will not shoot nails completely;no matter what wood,thickness,etc.they drive all but 1/2"


May be due to broken tip. Easy to check. Remove nails and leave door open. With door open, lightly tap the nose of the gun against coiled rubber hose or soft wood. The driver should stay at top position. If driver falls to bottom of the cylinder, replace piston oring. Now press nose of the gun against old coiled up air hose or soft wood and squeeze and hold trigger. The gun will fire and the driver should stay in the down position untill you release the trigger (if not single fire trigger, if single fire trigger remove trigger and press the trigger pin with finger). While the driver is down, make sure that the tip extends past the nose about 1/4 inch (if air leaks past the nose in this position, replace lower bumper). If the driver does not extend past the nose, replace driver. Good luck

Jun 24, 2011 | Stanley Bostitch N75c1 Coil Sheathing...

1 Answer

SLP 20 Leaks air from top and I Just replaced the chamber and o Rings.


The slp20 uses a firing valve part # ba0119 black plastic w/rubber boots. This valve is what prevents air from leaking thru top of gun. If pin hole has developed, or oring # lb0012 is not in place under the firing valve or if the retainer # bf0149 does not fit snugly on cylinder or has cracks, the gun will leak. Assuming oring is in place and retainer is good, suspect firing valve. Good luck

Mar 26, 2011 | Senco Fastening Systems No.43OOO1N SLP20...

1 Answer

Coil nailer wont feed nails, fires no problem


Remove nails from the gun and dry fire the gun by bumping it against thick rubber mat or coiled up rubber hose. As the gun cycles notice the feeder moving back then forward in time with the cycle. Make sure that the feeder is connected to feeder driver with a roll pin and that the check feeder is in place in the latch door. The check feeder is thin metal and should have spring action. The driver should return completely to top of cylinder with some degree of force. There should not be much air leaking out the nose as the gun cycles. If a quantity of air is leaking out nose with each cycle, then lower bumper may have broken/cracked. Replace as needed. If very little air is leaking out nose with each cycle then driver could be bent, piston oring could be worn or lack of lubrication in cylinder. If all lower parts seem good, then only area left to check is head valve. There is a 1/4 inch dia. rubber ring at the very top of head that could restrict air flow out of exhaust port. Adjust as needed. Good luck.

Mar 18, 2011 | Duo Fast DuoFast 1015141 CNP65Y Siding...

1 Answer

N12 nailer doesn't retract completly,changed all orings,trigger valve,cylinder/piston looks good and lubricated, whats wrong?


For nailer to retract properly the lower bumper should not be missing any pieces or cracked. The upper bumper should be pliable and complete. Pull the cylinder and check for a groove cut into cylinder with a series of holes. This groove should have a snug fitting oring. It should not take much force to move the piston within cylinder. If all seems good, re-assemble using silicone paste lube available at Lowes or swimming pool supply. Easy test. With air connected and nails removed, dry fire gun against coiled rubber hose. Keep holding the trigger and keep the gun against hose. The piston should stay down and no air should leak from gun while holding in this position. Lift up gun and the piston should retract. If air leaks from bottom while holding in this manner, lower bumper is not sealing, if air leaks from top, then upper bumper is allowing air to leak from head valve. Good luck

Feb 17, 2011 | Stanley Air Tools & Compressors

1 Answer

Titan spray gun issue


the fitting on the gun is bad or the wrong one. get a new one with the right threads for the gun end and the corrisponding fitting for the hose end. gun may be npt thread and hose might be jic thread.
chances are home depo has the correct fitting.

Oct 28, 2009 | Air Tools & Compressors

1 Answer

Paslode t250 f16 leaks air from the cap difuser


The most common problem with this nailer is the plastic seal that sits on top of the cylinder. This seal (ususlly white, yellow or black in color ) will cause the nailer to leak lots of air out top of gun. Examine seal for cracks and replace as necessary; the part number is 402725 and is available at www.toolpartsdirect.com This should stop the rapid air leak. After installing the new seal, if you have a very small constant leak out top of the gun then remove the screw holding the headvalve in place and check for small scratches where the orings contact headvalve. Use very fine sandpaper (300 to 400 grit) to remove scratches. Clean and re-use the same orings using silicone grease instead of oil and re-assemble. This should stop all leaks. Silicone grease is available at Lowes lumber in the plumbing department. It is used to lube orings in faucets. If you have more questions about this gun please email, Good Luck

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2 Answers

Senco SLP20 not working


Senco makes a line of nailers including the slp20 that use a firing valve (part # ba0119) that fires piston when trigger is depressed. These guns do not use oil because the oil will swell the rubber parts in the valve. When the rubber swells and tears slightly, symptoms that you describe will develop. Also remove the cylinder and look for cracks and make sure that the lower oring (LB0030) is in place and that tiny vent holes are clean. The lower oring is the checkvalve and causes the piston to retract. Use only the slightest bit of silicone lube on orings. Parts are available at www.toolpartsdirect.com. Good Luck

Jan 22, 2009 | Senco Fastening Systems No.43OOO1N SLP20...

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