A system for disassembling a drive pinion assembly of a starter motor is disclosed. The drive pinion assembly includes a drive gear and a pinion member coupled to the drive gear through a mounting hole defined in the drive gear. The system includes a base member for supporting the drive pinion assembly. The base member includes a through hole to align with the mounting hole of the drive gear. The system further includes a pin member slidably received in the through hole and an actuating member disposed around the base member. The actuating member is rotatable about a rotational axis defined by the base member. The actuating member includes a cam lobe for moving the pin member towards the mounting hole of the drive gear based on movement of the actuating member about the rotational axis to disassemble the pinion member from the drive gear.