OEM Scion tC Power Steering Pump

Scion tC Power Steering Pump Parts and Q&A

• Power Steering Pump
  44310-20870
  Q: How to service and repair the power steering pump on Scion tC?

  A:

  Users must start power steering service and repair by first removing the right-hand front wheel and draining power steering fluid. The service begins by taking off the front fender apron seal RH and then removing the fan and generator V belt. Next disconnect the oil reservoir to pump hose No.1 by removing its clip. Ensure that fluid does not drop on the V belt. The pressure feed tube assembly detachment begins by unscrewing its bolt and removing it from the pump bracket rear position before using a 27mm wrench to stabilize the pressure port union during bolt and gasket removal. First disconnect the oil pressure switch connector followed by using Special Service Tool: 09249-63010 and a deep socket (14 mm) to remove the vane pump assembly with its two bolts. Use Special Service Tool: 09630-00014 (09631-00132) for fixing the vane pump assembly inside a vise before removing the bolt which unlocks the vane pump bracket rear. Dismantle the power steering suction port union by extracting its bolt first then the union anddisposing of its O-ring. To begin the procedure start by removing the flow control valve through the process of removing its pressure port union together with both the flow control valve and compression spring and its O-ring. A replacement of the damaged oil pressure switch is necessary. You need to remove the housing rear of the vane pump by removing both the four bolts and the O-ring. The sub-assembly extraction starts with removing the snap ring through two screwdrivers before proceeding with removal. Start by uninstalling the 10 vane pump plates along with the vane pump rotor before proceeding to uninstall the vane pump cam ring and vane pump side plate front while discarding the O-rings from both parts. You should use a screwdriver to extract the housing oil seal without damaging the housing front. A thorough inspection of the vane pump shaft along with bush inside the housing front requires a measurement of oil clearance below 0.07 mm (0.0028 inch). Measurement of vane pump plates should reveal thickness values within the range of 1.405 to 1.411 mm (0.05531 to 0.05555 inch) before inspecting the vane pump rotor groove clearance against vane plates to verify it does not exceed 0.03 mm (0.0012 inch). Power steering fluid coating on the flow control valve should be checked for smoothness but replacing the vane pump assembly must be done if the valve fails to fall smoothly. Abide by the leakage check by applying compressed air to the flow control valve and confirming that no air leaks through its end holes. Record the unstrained state length of the compression spring because it must exceed 36.9 mm (1.453 inch). Replacement of the vane pump assembly becomes necessary when damage is detected on the pressure port union. The installation process requires Special Service Tool: 09950-60010 (09951-00280), 09950-70010 (09951-07100) for a press combined with power steering fluid-coated new housing oil seals with their lips first positioned in the correct direction. Install the w/pulley shaft sub-assembly within the housing while paying close attention to avoid injuring the housing oil seal lip. Connect the front side plate of the vane pump while applying new O-rings that have been coated with power steering fluid and maintaining the correct alignment of components. Set the vane pump cam ring with the inscribed mark at the top position before placing the vane pump rotor and plates in the correct orientation where the round plate ends should face outward. After installing a new snap ring onto the w/pulley shaft sub-assembly proceed with installing the vane pump housing rear which includes a new O-ring then torque the straight pin to 22 Nm (224 kgf-cm, 16 ft.lbs.). Verify pump preload by inspecting rotational motion with smooth operation and without noise before temporarily inserting the service bolt (10 mm diameter with 1.25 mm pitch and 50 mm total length). Then check the pulley rotational torque. Next, install the power steering oil pressure switch then fasten the flow control valve with the compression spring by applying power steering fluid to both components. Fitting a new O-ring on the pressure port union requires torquing it to 69 Nm (704 kgf-cm, 51 ft. lbs.). Secure the vane pump bracket rear part by torquing it to 37 Nm (377 kgf-cm, 27 ft. lbs.) while verifying that the stopper touches the vane pump body. Use a new O-ring for installation of the power steering suction port union then tighten the fasteners to 12 Nm (122 kgf-cm, 9 ft. lbs.). The process concludes by adding the vane pump assembly then using Special Service Tool: 09249-63010 with a deep socket (14 mm) to secure bolt torques at 34 Nm (347 kgf-cm, 25 ft. lbs.). Afterward, reconnect the oil pressure switch connector while installing the pressure feed tube assembly with a new gasket followed by torqueing the union bolt to 52 Nm (525 kgf-cm, 38 ft. lbs.). Following installation of the pump bracket rear pressure feed tube assembly, tighten it to 7.8 Nm (80 kgf-cm, 69 inch lbs.). Afterward, attach the oil reservoir to the pump hose No.1 and then place the fan V belt and generator V belt in position with the use of Special Service Tool: 09249-63010. The technician should next install the front fender apron seal and front wheel RH while torquing to 103 Nm (1,050 kgf-cm, 76 ft. lbs.). After bleeding the power steering fluid technicians must check for any fluid leaks.
• Power Steering Pump
  44310-21050
  Q: How to install the Power Steering Pump and ensure proper connections and torque specifications on Scion tC?

  A:

  Install the vane pump assembly by first tightening the two bolts to the vane pump but later use these bolts to fasten the vane pump permanently. The 34 Nm (347 kgf-cm, 25 ft-lbf) torque must be applied to the 2 bolts using Special Service Tool: 09249-63010 and a 14 mm deep socket after the torque wrench reaches a 300 mm (11.81 in.) fulcrum length and maintains tool parallelism with the wrench throughout the process. The oil pressure switch requires attachment with a connector next. The pressure feed tube assembly requires installation of the pressure feed tube with new gasket to the vane pump through a union bolt method. It is essential to position the stopper of the pressure feed tube against the vane pump body. Holding the pressure port union with a 27 mm wrench secure the union bolt to 50 Nm torque before attaching the pressure feed tube with bolt to the pump bracket rear and torquing it to 7.8 Nm. Secure the No. 1 oil reservoir to the pump hose through the clip but avoid wasting fluid on the V belt. Set the fan V belt into position along with the generator V belt and also install the front fender apron seal right hand side before putting the right hand side front wheel in place. Power steering fluid bleeding should be performed before a final inspection of fluid leakage takes place.