Go to other end of planer and remove gear box cover. It simply lifts off.

Tie drive chains together so everything stays in same location. Remove three retaining rings with a retaining ring plier (easiest and safest way to do it, buy one at your local hardware store).

Pull off two sets of chain and sprockets and carefully lay aside.

Remove four M5 x 35mm screws with a 4mm allen wrench. Leave the remaining two bolts in place.

Using a bearing removal tool, drive the bearing out of its socket. This will drive the bearing out of the other end so stop when both bearings are loose.

My turned bearing removal tool. It worked fine.

With proper gloves to protect your hands, carefully remove the cutterhead assembly.