Check Firing Valve: This is the key part which regulates compressed air in or out of the cylinder sleeve. In oiled tools, the firing valve is a circular piston equipped with o-rings. The no-oil tools feature a unique, inflatable diaphram that serves as the firing valve.
If you buy a reconditioned gun, ask them to hook it to a compressorer,
then put a stick through it. If it doesn't jam or feeds properly, then
it should be ok.
Clipped head nails, picture bullets in a gun, they are all round heads
and need to be stacked so they don't jam the one below as they feed.
With clipped heads, they come in sticks, its just so they don't grab
the nail behind.
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Some causes, in order of probability: Roofing nailers get a lot of tar build up on them, especially around the nose safety and nail feed pawl area. Cleaning off this buildup will usually take care of most problems with roofing nailers. On the side of the gun away from the side you load the nails on there is a small cylinder with a piston inside that attaches to the feeder pawl. If air isn't getting to the piston or the piston's o-ring or spring is damaged, it won't cycle properly to advance the nails. If the driver doesn't retract fully, the next nail won't be able to advance properly for the next shot. This can be caused by o-rings in the head that are worn or out of their proper place.
Some reasons the driver/piston assembly won't retract fully: - damage to the o-ring (LB1003) around the piston - cylinder (BA0165) is scored badly - driver (EA0167) is bent, twisted or warped - o-ring (LB1023) around bottom of cylinder (in groves & covering small holes) is stretched out or out of place. - Seal (BC0492) at bottom of cylinder & under bumper is damaged or gone
that is the problem, I would take a look at the piston o ring for wear. Remove all the nails and air. BUMP the tool and see if the driver falls down and if so that would indicate a worn o ring. When replacing use a light film of oil to lubricate.
The Senco FP600 is an older model gun, if it has been getting reguar use check the driver. After a lot of nails the tips tend to get rounded off towards the back side and if the nail hits some dense wood or a knot the head will slip off before it can be driven home. Replace the driver if so, trying to grind the end square will only result in problems with the guide when the driver retracts into the head.
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.
Hi, That would be the cylinder check seal on the outside of the cylinder sleeve. That sits in the groove with little holes in it. When The driver goes down the air goes out the little holes and forms a vacuum above the driver, pulling the driver blade assembly back up. So if the cylinder seal is bad it won`t work.
Senconailers are very reliable however could suffer from several issues that would cause your problem. Here are a few things to check that may solve your problem. Bent driver, worn parts, broken check valve. Main problem with all finish nailers is bent driver blade. Easy to check, remove and examine. The driver should travel length of cylinder without jaming. Driver oring/plastic ring should fit snug into cylinder. Remove cylinder and check the oring neer the bottom of the cylinder. This is a check valve. There are small holes that should be cleaned. If oring is loose or broken just use any oring that fits snuggly. Next, check that lower bumper is not chipped or cracked and that washer under bumper is not too worn or missing. Replace parts as necessary. (www.toolpartsdirect.com)