How to Replace the Sub-Base on a Porter-Cable Router

The sub-base attaches to the router's base. It provides a smooth surface to guide the router across the material being shaped. The center hole on the sub-base has a shoulder to accept guide bushings. The four outer holes are windows, which enable you to see the workpiece you are routing. The most common issue with the sub-base is accidental damage caused by dropping the router (or other items coming in contact with the sub-base). The sub-base can also be cracked if the mounting screws are over-tightened. If damage does occur to the router's sub-base, you will want to replace it to keep the router operating properly and accurately.

Let's get started.

REMOVING THE SUB-BASE   1. Remove the sub-base.

a. Remove the four screws securing the sub-base to the router.

b. Lift the old sub-base off the router.

INSTALLING THE NEW SUB-BASE

  2. Install the sub-base.

a. Align the new sub-base with the mounting holes on the base.

b. Secure the new sub-base with the four screws.