Cylinder 079073001002

1. Unscrewed the casing of the gun
2. Took out the cylinder and driver assembly
3. Moved o-rings onto new cylinder
4. Put new driver assembly into new cylinder
5. Put new cylinder into nail gun
6. Screwed nail gun back together

1. Take off the back of the nailer off, usually 4 Allen bolts, there is a spring in the head valve so itGÇÖll try to push out, I usually unscrew a little of each bolt at a time.
2. Once open, you wanna get the cylinder loose, I use rag and grab ahold of the cylinder and gently move it in all directions, while trying to pull, mine c ... Read more ame out easy because it was cracked, but some can be tight. Take your time and it will pop out.
3. Inspection of broken parts first, then all o-rings that are on the cylinder and the driver were changed.
I use a little grease on each so the o-ring doesnGÇÖt twist or not seal properly.
4. Make sure you took note of which way the cylinder goes and the plastic ring that holds it in place, I usually take pictures, and ziplock/label parts that are easy to lose.
5. After all o-rings are changed, install the cylinder, you need to be gentle but push as even as possible so there is a good seal, install the driver after a bit of grease, making sure you are right side up, the driver rod has a groove, make sure you look to see which way yours goes in.
6. Finally done with the hard part, to reinstall the back valve body, first replace the gasket, then line up the bolt holes, the spring will push up, so you need to hold it and install the two adjacent screws first, holding it down prevents stripping the bolts, and once they are all in I will tighten in a sequence,
(R top, L bottom) and same on the other two bolts.
7. Finished, first attach air hose, to check for leaks, if non insert nails and test on a scrap board. Adjust sink depth because that can change with new seals.

My gun works, I love it, rigid is my favorite nailer, and ereplacementparts.com is my go to for buying parts for all my tools!