Disassembly (Model "CB")

Remove pump assembly from vehicle. Remove retaining clips between reservoir and housing and remove reservoir from housing.
Remove union fitting and "O" ring. Remove control valve assembly and flow control spring.
Protect drive shaft with shim stock and using a small chisel, cut drive shaft seal and remove. Using small drift punch, remove end cover retaining ring. See Fig 1 .

Fig 1: Removing Retaining Ring (Pump Model "CB")
Courtesy of GENERAL MOTORS CORP.
Remove internal components of pump by gently pushing on drive shaft. See Fig 2 .

Fig 2: Exploded View Of Power Steering Pump (Model "CB")
Courtesy of GENERAL MOTORS CORP.
Remove "O" ring from pump housing. Remove locating dowel pins. Remove drive shaft seal (if not already removed). Remove end cover, pressure plate spring and "O" ring from pressure plate.
Remove pump ring and vanes from drive shaft subassembly. Remove retaining ring from drive shaft. Remove pump rotor and thrust plate from drive shaft.