OEM Scion xB Power Steering Pump

Scion xB Power Steering Pump Parts and Q&A

• Power Steering Pump
  44310-52090
  Q: How to service and repair the power steering pump on Scion xB?

  A:

  Serviceable power steering pump repair starts with removal of the front wiper arms together with the hood to cowl top seal alongside the cowl top ventilator louvers (each side) along with the windshield wiper link assembly and the cowl panel sub-assembly and vane pump oil reservoir cover. Before starting service and repair on the power steering pump drain all fluid and take off the front wheel (RH) with the engine under cover (RH). Remove the pressure feed tube assembly through the usage of Special Service Tool: 09023-12700 to disconnect both the return hose and oil pressure sensor connector. Detach the vane pump stay rear by unbolting its components including bolt, stay rear and heat insulator. Once the vane pump assembly is secured in the vise with Special Service Tool: 09630-00014 (09631-00132), proceed by removing the vane pump oil reservoir cap sub-assembly and the oil reservoir assembly while being cautious to salvage the O-ring. The next step requires removing the pump bracket front together with flow control valve and power steering oil pressure sensor and the vane pump housing rear while removing the O-ring. The w/pulley shaft sub-assembly and vane pump rotor should be removed together with the cam ring and then followed by removing the vane pump side plate front and its O-rings. Pronounce caution when removing the housing oil seal to prevent any form of breakage. The vane pump shaft together with housing front bush needs inspection for oil clearance that should remain under 0.07 mm (0.0028 inch). The measurement of vane pump plate thickness should fall between 1.405 to 1.411 mm (0.05531 to 0.05555 inch) while the vane pump rotor groove clearance must not exceed 0.03 mm (0.0012 inch). The inspection of the flow control valve must check for smooth functions without leakage, while the compression spring free length should measure at least 29.2 mm (1.150 inch). The vane pump assembly requires component replacement when it contains elements which have suffered damage or moved outside their specified parameters. Install the new housing oil seal following procedure with Special Service Tools: 09950-60010 (09951-00280), 09950-70010 (09951-07100), a press necessary for correct assembly. The w/pulley shaft sub-assembly requires power steering fluid on its housing front bushing surface before installation while avoiding damage to the oil seal lip. To assemble the vane pump system start by correctly aligning the vane pump side plate front and cam ring unit before adding the rotor and plates while applying power steering fluid onto the plates. Insert a newly fitted snap ring onto the w/pulley shaft sub-assembly before attaching the vane pump housing rear section with its new O-ring. Perform this installation operation by achieving correct alignment and torquing it to 22 Nm (224 kgf-cm, 16 ft. lbs.). Users should check for smooth pump rotation and measure the rotating torque that should be 0.27 Nm or less (2.8 kgf-cm, 2.4 inch lbs.). First install the power steering oil pressure sensor by applying a new O-ring then torqueing to 21 Nm (214 kgf-cm, 15 ft. lbs.). Afterward install the flow control valve using its components and torque the pressure port union to 69 Nm (704 kgf-cm, 51 ft. lbs.). Install the front portion of the pump bracket by torquing it to 44 Nm (449 kgf-cm, 32 ft. lbs.) before installing the vane pump oil reservoir assembly with a new O-ring while torquing to 9.0 Nm (92 kgf-cm, 80 inch lbs.). Proceed with installing vane pump components while the V belt must be tensioned before complete torquing. Use Special Service Tool: 09023-12700 to install the pressure feed tube assembly by torquing it to 41 Nm (414 kgf-cm, 30 ft. lbs.) following proper installation of the heat insulator on the vane pump stay rear. Adjust the V belt then inspect Drive Belt deflection before checking tension together with adding power steering fluid and bleeding the system and inspecting fluid leaks. reinstall the engine under cover (RH), front wheel (RH) with 103 Nm (1,050 kgf-cm, 76 ft. lbs.) torque then continue with checking the power steering fluid level for the reservoir and replacing the vane pump oil reservoir cover, cowl panel sub-assembly, windshield wiper link assembly, cowl top ventilator louvers (LH and RH) and the front wiper arms (LH and RH).