Question about Senco FP620 Framepro 602 2" - 3 - 1/2" Full Round Head Nailer

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The nail gun shoots out 2-3 nails at one time, I clear the jamb & start over and the same thing happens over and over. What could be my problem?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1383 Answers

SOURCE: 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.

Posted on Mar 16, 2009

  • 65 Answers

SOURCE: after each shot the nail gun jams

hi visit your supplier and ask for a overhaul kit once fitted your tool will be licke new
best of look ian

Posted on Mar 25, 2009

bargainbin2
  • 123 Answers

SOURCE: air bypassing when the trigger is pulled

You will need to get a repair kit for that model and brand nailer. It has a leek in the diaphragm or a bad O-ring.

Posted on Aug 29, 2009

  • 497 Answers

SOURCE: Shooting two nails instead of one

i would double check the plunger to make sure its resetting after each fire.

Posted on Nov 06, 2009

  • 142 Answers

SOURCE: Senco 601 nailer shoots 2 nails each time the trigger is pulled.

the 601 had a design flaw, in the nose, where the nails hit as the are being pushed forward, the peice was made out of a peice of metal that was too soft, it wore down and that is where you get the double nail problem.

Senco offered a trade in, this was years ago, for a limited time and gave us credit towards new guns, which we gladly did

Posted on Dec 31, 2009

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