HD Hex Motor (REV-41-1291) With Pinion Pressed On
A Small Flathead Screwdriver
Hex Shaft For Leverage (or similar)
1) Using a small flathead screwdriver, pry up on the base of the pinion.
2) Once the pinion has been moved enough, you may need to add a Hex Shaft or similar to give you enough leverage to completely remove the pinion.