Ok. Lastly, the channel and pipe fitting is for flood coolant. Usually soluable oil. Since you are new to SGs, I feel I should mention that if you are using coolant, or grinding carbide, or using a diamond wheel (or just for personal safety) it is essential that you run a fan to draw the products of the grinding out of the building.
I can't speak to the lube issues, as I have a B&S, not a Harig.
Yes you absolutely need lube (oil) on the ball ways.
I hope these quick comments help.