Fixing a Leaky RF-45 Mill Head - Enco

[f350ca]

A seal driver is simply a piece of tube that just catches the outside edge of the seal where it presses in. As long as you don't deform the lip area your laughing. Its nice to press them in if you can, keeps them square to the bore to avoid distortion, but lots are driven in with the seal driver and a hammer when the part is too big to get to the press.
From your photo, usually the lips point away from each other on a two seal set up. One to hold the oil in the other to keep dirt out, but every situation varies. On a double seal be sure to lube between them and the seal surface, you don't want them running dry, real short life in that state. Press the first one to depth, then press the second one in, best not to push one with the other.
Hope this helps,
Greg