OEM 2003 Toyota 4Runner Power Steering Pump

2003 Toyota 4Runner Power Steering Pump Parts Questions & Experts Answers

• Q: How to service and repair the power steering pump on 2003 Toyota 4Runner?

  A: The power steering fluid service process starts with front wheel right-hand removal followed by draining the power steering fluid from the system. Start by removing the engine under cover assembly rear through bolt removal of its 6 fasteners and then detach engine under cover sub-assembly No.1 after taking out 4 bolts. First isolate the fan and generator V belt and then remove the oil reservoir to pump hose No.1 clip before you disconnect the pressure feed tube assembly with Special Service Tool: 09023-12700. Detach the vane pump assembly from its components first by disconnecting the oil pressure switch connector and taking out 2 bolts. Apply Special Service Tool: 09630-00014 (09631-00132) to fix the vane pump assembly in a vise before removing the power steering suction port union by taking out its bolt and O-ring. Start by disassembling the flow control valve by first removing its pressure port union with its O-ring and then proceeding to remove the valve together with its compression spring. Disconnect the oil pressure switch while being careful to not damage it before using a tool to remove the vane pump housing rear by disconnecting its four bolts and extracting the O-ring from the front end of the pump housing. Use a screwdriver to remove the snap ring and then detach the vane pump rotor followed by removing the 10 vane plates from the assembly sub-structure. Separate the vane pump cam ring from the front side plate by removing them both with their O-rings. The removal of vane pump housing oil seal should be done carefully using a Special Service Tool and hammer while we avoid impacting the housing front. Use a micrometer and caliper gauge to check oil clearance which must be between standard and maximum limits; replace the vane pump assembly if clearance measurements fail to meet requirements. Use a feeler gauge to measure vane pump rotor plates and rotor height and thickness. Calculate rotor plate clearances before making an assembly replacement if needed. The flow control valve inspection requires application of power steering fluid while testing operation while checking for leakage; an exchange is necessary if either issue is detected. A replacement vane pump flow control valve compression spring is required when its free length measurement fails to match the specifications. If the pressure port union shows any damage you must replace the assembly. Position the new vane pump housing oil seal according to its specified direction before installing the w/rotor shaft sub-assembly while avoiding damage to the oil seal lip. Install the front side plate through its newly coated O-rings in power steering fluid while aligning properly before you add the cam ring along with vane pump rotor so inscribed marks face outward. Place vane plates inside power steering fluid before mounting them through the round openings outwards while using a new snap ring for locking mechanisms. The vane pump housing rear must receive its new O-ring then every component must be aligned precisely before torquing to 22 Nm (220 kgf-cm, 16 ft. lbs.). The preloading of the pump should be checked by monitoring its rotation for noiseless smooth movement while using a specified service bolt to measure the torque which needs to be less than 0.27 Nm (2.8 kgf-cm, 2.4 inch lbs.) and less. The installation requires the power steering oil pressure switch using a newly oiled O-ring and then torquing to 21 Nm (210 kgf-cm, 15 ft. lbs.). Next apply the flow control valve with compression spring while ensuring proper lubrication and installing a new O-ring on the pressure port union, torquing it to 69 Nm (700 kgf-cm, 51 ft. lbs.). Lines of installation include attaching the suction port union with a 12 Nm (120 kgf-cm, 9 ft. lbs.) torque using a new O-ring then fixing the vane pump assembly through two bolts torqued to 43 Nm (438 kgf-cm, 32 ft. lbs.) at the same time as carefully joining the oil pressure switch connector. Connect the pressure feed tube assembly with Special Service Tool 09023-12700 and torque it to 51 Nm (520 kgf-cm or 38 ft lbs.) before clipping the oil reservoir to pump hose No.1. The technician installed the fan and generator V belt alongside front wheel torquing on the right-hand side to 112 Nm (1,142 kgf-cm, 83 ft lbs.). Then he added power steering fluid before bleeding the system and examining for leaks. Lastly, he reinstalled engine under cover sub-assembly No.1 and engine under cover assembly rear with their respective bolts.