Most often it is a jammed nail in the nose or a bent driver blade.
If you can push the driver back up when the tool is unplugged, then I would replace the trigger valve and upper o-rings
SOURCE: How to unload nails from Senco FinishPro 35
when you pull the spring back like your going to load it .put your finger in the hole and push it .you'll see that the nails will be release.
SOURCE: senco finishpro ,the casting at the end of the
Go to Senco.com and type in your model number. It should be on a plate somewhere on the tool, if not there is a toll free number for their tech support that can help you with this problem.
SOURCE: Shooting two nails instead of one
i would double check the plunger to make sure its resetting after each fire.
SOURCE: Nut just above knurled depth
You do not need to wory about that nut. If you do want to change it you can learn how on the link below.
http://www.senco.com/Documents/Guides/FIP35_PC.pdf
SOURCE: Senco 35 finishpro not
Usually this problem is caused by not having enough air pressure from the compressor to the gun.....or you have something restricting the ram travel to the nail head. You may also have a restriction in the exhaust air port of the gun that is not allowing the ram to travel properly. You could also be experiencing a leak around the ram "O" ring that is causing loss of air pressure to the ram. In this case a repair kit that can be purchased at you local builder's supply with solve the problem. Directions are in the kit so you won't have any problems with the repair.
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