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

2 Answers

Senco SLP20 not working

We have a Senco SLP20 which is a few years old. When attempting to shoot gun, it will fire once and then air is hissing through top vent and piston has not retracted. I have taken it apart 3 times and lubed everything well to no avail. Any ideas?
Thanks,

Chris

Posted by on

  • chris_lewis Jan 23, 2009

    Just an update of the given information, the piston does not move freely the whole travel of the tube. It sticks about 3/4ths of the way up. I don't see any cracks or anything that would cause it to do this. I have been using wd40 and oil in my repair process, though have wiped as much of it back off as possible. I would assume that the piston should move freely up and down the full length of the tube. Should I replace the tube?

    Thanks,



    Chris

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I would recommend biting the bullet and putting new o rings in the tool. It sounds like one is either flattened or possibly pinched. Before going that far look at the cylinder and see if it is scored. I would go to Senco's website and look at a breakdown and that would also be a source of a parts kit. It is not that hard. Let me know if you can't find any information for this tool

Posted on Jan 22, 2009

  • David Ford
    David Ford Jan 23, 2009

    I would definetely not use WD 40 as a lubricant on the O rings, Yes the piston should move freely but with a slight resistance of the piston ring, I would still recommend putting a new o ring kit in it especially after the WD 40. Like the other comment use some silicone lube on the rings during assembly but don't pack them full.

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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

Posted on Jan 22, 2009

  • John Trevino Jan 23, 2009

    The slp20 uses a fiber/plastic ring on the piston with a rubber oring under. This plastic ring does not need oil. Wd40 causes orings to swell. Could be that the oring under the plastic ring is causing problem. Test would be to remove the oring from under plastic ring and try piston in cylinder again. You should be able to use the gun without the oring under plastic ring unless the piston is then too loose in cylinder. I have seen many of these guns with rubber oring instead of plastic. This does not work as well and will jamb the piston in cylinder. Good Luck

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