How to Replace the Inner Flange on a Makita Grinder

The inner flange works with the lock nut to secure the grinding disc to your grinder. It has a 5/8-inch, non-threaded hole, a recess milled into it (that engages the spindle), and a 7/8-inch hub to accept standard grinding wheels. Over time, the flange can wear, causing the grinding wheel to wobble.

Let's get started.

REMOVING THE INNER FLANGE   1. Remove the inner flange.

a. Depress the spindle-lock button on the top of the gear housing.

b. Rotate the grinding wheel until the spindle-lock engages.

c. Use the spanner wrench to loosen and remove the lock nut from the spindle.

d. Remove the grinding wheel from the spindle.

e. Remove the inner flange from the spindle.

INSTALLING THE NEW INNER FLANGE

  2. Install the inner flange.

a. Install the new inner flange onto the spindle (the recessed portion of the flange should face the spindle hub).

b. Rotate the inner flange until the spindle hub engages the recess.

REASSEMBLING THE UNIT

  3. Reinstall the lock nut.

a. Install the grinding wheel or cut-off disc.

b. The lock nut is reversible: If you are using standard-sized grinding wheels, the raised portion of the center hub (on the lock nut) should face the grinding wheel. If you are using cut-off discs, the flat side of the nut should face the discs.

c. Thread the lock nut onto the spindle (with the appropriate side of the nut facing the grinding wheel or cut-off disc).

d. Depress the spindle-lock button on the top of the gear housing.

e. Use the spanner wrench to secure the lock nut to the spindle.