How to Replace Rusty Posts Yourself

Detach the chain-link fence from the rusted post by using the pliers to remove the fence ties. Unbend one end of each of the fence ties enough to unhook it from the fence and release the post.

Remove the post cap holding the top rail to the rusted post. Depending on how tight your fence is, you may need to cut through the bottom of the post first, but make a first attempt to loosen the cap by hitting it from one side and then the other with a rubber mallet. After the cap is wiggling freely, slip it off the top of the post. If the top rail of the fence is too tight to allow you to lift the cap off the rusted post, instead use a reticulating saw or a hacksaw to cut through the rusted post at the bottom near the cement.

Dig the rusted post's cement base out of the ground. Try to remove as little dirt as possible when digging the cement base out because you have to put another post in the same location. Essentially, you'll dig all the way around the cement column and all the way to the bottom of it.

Secure the post cap to a new post and place the bottom of the post in the hole you dug to remove the rusty post.

Mix the concrete in a concrete mixing barrel by pouring in the dry material and adding water according to the manufacturer's instructions. Screw the cap on the barrel and roll it back and forth for three minutes. Check the consistency of the concrete; it should be the consistency of sloppy joe mix.

Hold the post upright in the center of the hole and pour the cement mix all around the post. Brace the post upright if necessary. Often, the established fence line and top rail will be sufficient to hold a replacement post upright while the concrete sets. Allow the concrete to set up overnight.

Reattach the fence ties around the new post and squeeze the loop closed with a pair of pliers.