Unplug tool, remove the handle assembly making note of the wiring, turn the tool over and remove the rear pulley under that you will find 2 torx drive screws remove them and then gently tap the housing to start to remove the gear assembly. remove the 4 bolts holding the gearcase to the motor housing and pull apart, when apart you can finish tapping and the lower gear along with the top one will "jump out" Let me know if you still have any problems