OEM 2003 Toyota Highlander Power Steering Pump

2003 Toyota Highlander Parts Questions & Experts Answers

• Q: How to service and repair the power steering pump on 2003 Toyota Highlander?

  A: The power steering pump servicing process begins with front wheel RH removal and draining power steering fluid followed by taking off both front fender liner RH and front fender apron seal RH. Use Special Service Tool: 09249-63010 to remove the fan and generator V belt followed by disconnecting the oil reservoir to pump hose No.1 through clip removal but keep the V belt free from fluid leakage. Start by disconnecting the pressure feed tube assembly through separating its connector from the oil pressure switch and using a 27 mm spanner for rotating the pressure port union to remove the union bolt and its gasket. The vane pump assembly removal process starts with disconnecting the oil pressure switch followed by loosening bolt A with Special Service Tool: 09249-63010 and a 14 mm deep socket and then removing bolt B together with the vane pump assembly. First remove the suction port union with O-ring from power steering system before removing the pressure port union that contains its O-ring. Detach the flow control valve and compression spring while maintaining safe handling of the oil pressure switch because replacement might be necessary if it shows damage. Extract the w/pulley shaft sub-assembly through removal of the snap ring and shaft while following the step of taking off 4 bolts and an O-ring from the vane pump housing rear. The procedure involves removing the vane plates alongside the vane pump rotor before proceeding to extract the vane pump cam ring and front side plate. During this step the team should detach both the side plate and pump housing front O-rings. Measure the vane pump housing oil seal clearance using a micrometer and caliper gauge after its extraction using a screwdriver with vinyl tape - change the vane pump assembly when clearance exceeds 0.07 mm. Check the vane pump rotor and plates' dimensions and change the assembly if any measurement is lower than minimum standards. Inspect the flow control valve for smooth operation and leakage then install a new spring assembly only if the free length measurement falls below 36.9 mm. The pressure port union also needs inspection for damage with new assembly installation as required. The new oil seal needs to be correctly oriented before the front side plate gets installed with new O-rings while the dents should be correctly aligned. Place the vane pump cam ring with an inscribed mark facing outside before installing the w/pulley shaft sub-assembly and vane pump rotor with outermost inscribed mark while applying power steering fluid on the vane plates. The vane pump housing rear needs a new O-ring during installation while having the straight pin properly aligned before securing it with 4 bolts at 22 Nm torque. Place the vane pump rotation torque gauge to check if it meets the specification of 0.27 Nm or less before installing the power steering oil pressure switch with a new O-ring at 21 Nm torque setting. Begin installation by putting the flow control valve compression spring and the flow control valve together then add the pressure port union with a new O-ring tightened at 69 Nm and after that add the power steering suction port union with a new O-ring tightened at 12 Nm. The final installation involves tightening bolt A briefly followed by tightening bolt B to 43 Nm before applying 30 Nm on bolt A through the use of Special Service Tool: 09249-63010. The pressure feed tube assembly includes a gasket which requires the stopper to touch the pump housing before tightening the union bolt to 51 Nm. Reconnect the oil reservoir to pump hose number one using Special Service Tool: 09249-63010 for installing the fan and generator V belt then reassemble front fender apron seal and front fender liner and front wheel RH at a torque of 103 Nm. The power steering fluid should undergo a bleeding procedure before inspecting for any signs of leakages.