Oil Pump: Disassembly

REMOVE RELIEF VALVE
1. Using snap ring pliers, remove the snap ring.
2. Remove the retainer, spring and relief valve.
  
  Fig 1: Removing Relief Valve Snap Ring
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE DRIVE AND DRIVEN ROTORS
Remove the 10 screws, pump body cover, the drive and driven rotors.

Fig 2: Locating Oil Pump Body Cover Screws
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002