Use a hydraulic press and proper support to assemble the accessory drive in the following order:
• Press the accessory drive shaft into the bearing, while supporting the bearing inner race, until the drive shaft bottoms on the inner race
• Press the outer race of the bearing, with drive shaft, into the accessory drive housing, until the outer race
bottoms in the housing
• Press the accessory drive gear onto the shaft while supporting the bottom of the drive shaft. Press until gear bottoms against inner bearing race.