Thank you for the comment! Yes, your pressure gauge could be inaccurate and giving you a lower PSI reading that it should be. Once you rule that gauge out, I would confirm the cylinder seal is in good shape...sometimes this is not included in an o-ring rebuild kit. It's the seal right on top of the cylinder that butts up against the head valve. Also, make sure the inside of the head cap is not worn badly. If you replace the cylinder seal and all o-rings on the nailer and this still happens, most likely it's one or more of the "hard" parts that are worn down (head valve itself, head cap, etc.). Hope this helps!

Thanks for reply. The repair man at the shop, who replaced all the seals and O rings, said that I was not using enough oil. He says that a few drops is not enough. OK so maybe on finishing guns, because they would spray oil on the woodwork, put a little less oil. He said it is always better to use too much than not enough. Also he said that the O rings should not roll but rather slide. Apparently the inside of my gun looked gummy. He said that after putting the oil inside, sure you can cycle them once or twice, but try to store them- handle up. I am going to watch your video all over again.

@@user-pf2hv8qw1s That is correct, it is a good idea to store the gun handle up. It's not necessary to use more than 4-5 drops of oil in the nailer, honestly. We have been doing this in our shop for years without a problem. If the nailer was gummy inside, however, you probably do need to add more oil. Hope you get it back in working order again!

Thank you for the compliment and we appreciate you watching!

Thank you for the watch and for the question! I would say first to make sure you have enough pneumatic oil in the nailer so that the cylinder is not sliding up as fast as it should be, and that you're using the correct oil. This may be obvious, but I need to state that. It could also be that wide rubber band "check ring" around the main cylinder in the body of the nailer is defective, and has lost its stretch. That is the first thing I would check. It may be necessary to replace all of the main o-rings in the cylinder, piston and head valve if you can't find an obvious problem, but the cylinder band I mentioned above is the cause of this problem a lot of the time. I hope this helps!

Welcome! We appreciate the watch and the compliment!

Since I don't have your model# or the nailer here physically, it would be best for you to call a technical rep at Porter Cable directly. You can reach them at 1 (888) 848-5175.

Thanks for watching! Any oil that is labeled for pneumatic nail guns or pneumatic fasteners is ideal to use.

Ik Mean oil

@@janmartens7954 We're using standard pneumatic tool oil. It doesn't need to be brand-specific, either. You can obtain this anywhere nail guns are sold.

Thanks for the comment! If the driver shoots as soon as you hook up the air hose to the gun without even touching the trigger mechanism, it's usually a problem with the trigger o-rings. I would remove the trigger stem and related parts to see if the o-rings are damaged or dry. If the o-rings look nice and round and aren't obviously damaged, you may just need to lubricate the o-rings and reinstall the trigger components. If that doesn't take care of the problem, the issue is with the Cylinder Seal around the main Cylinder in the body of the nailer. You'd have to remove the Head Cap, then remove the Cylinder itself to see if the larger rubber band (about 1" wide) is damaged. Many times times, new O-rings and a new Cylinder Seal will take care of most nailer problems, including this issue. I hope this helps!