Makita Jack Hammer HM1203C 2010 Piston Service

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Use an arbor press and a custom punch to carefully press the crank shaft, bearing, and gear assembly out of the housing.
If you don't have access to a press or custom tool, use a punch and a hammer to tap the crank shaft until the whole crank shaft, bearing, and gear assembly starts to slide out.
It may also be necessary to use a smaller punch to tap on the edges of the bearing through the small holes in the aluminum housing on either side of the crank shaft.
During reassembly, make sure the bearing and gear are lined up with the hole in the aluminum housing before pressing them back in. Make sure the shaft is lined up with the cutout before reinstalling the assembly.

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