OEM 2005 Toyota 4Runner Power Steering Pump

2005 Toyota 4Runner Parts Questions & Experts Answers

• Q: How to service and repair the power steering pump on 2005 Toyota 4Runner?

  A: The power steering service and repair process starts with draining power steering fluid combined with air cleaner assembly uninstallation. The belt tensioner must have its counterclockwise motion begun to eliminate the vane pump V belt. Remove the connectivity between the pressure feed tube assembly and its union bolt and gasket. Weak the clips and disconnect vacuum hoses from the oil reservoir to pump hose number one. First disconnect the vane pump assembly by removing its 2 bolts and nut then using a Torx(R) socket (E10) to loosen the stud bolt. Check the maximum rotating force of the vane pump with a target range between 0.28 Nm (2.8 kgf-cm, 2.4 inch lbs.) during smooth operation without unusual sounds and noises. The pulley can be prevented from rotating with SST 09960-10010 (09962-01000, 09963-01000) allowing you to remove the nut and vane pump pulley. Begin by removing successively the suction port union and O-ring before moving to the pressure port union, flow control valve and spring and O-ring from the pressure port union. The removal of the four bolts from the vane pump housing rear allows access to dislodge its wave washer and side plate by performing a light plastic hammer tap. To disassemble the vane pump take out the side plate, wave washer, cam ring by unfastening the snap ring and remove the 10 vane plate rotor so plates do not fall out. Lift out the vane pump shaft together with its 2 straight pins from the front side of the housing. Wear vinyl-covered tape on a screwdriver to extract the housing oil seal from its position while being cautious to protect the vane pump housing front. A micrometer and caliper gauge should be used to measure the oil clearance while confirming it stays between 0.03 - 0.05 mm (0.0012 - 0.0020 inch) and remains below 0.07 mm (0.0028 inch). Use a measuring instrument to verify that 10 vane plates have a minimum height of 8.6 mm (0.33858 inch) and thickness of 1.397 mm (0.05500 inch) and length of 14.991 mm (0.59020 inch). The vane pump rotor groove measurement with a feeler gauge should not surpass 0.033 mm (0.00130 inch) maximum clearance. Check the flow control valve operation by applying compressed air to both end holes and inspect the valve free of leakage after coating it with power steering fluid. Vernier calipers should measure the free length of the flow control valve compression spring to guarantee a minimum of 33.2 millimeters (1.307 inches). A faulty pressure union seat within the pressure port union requires replacement of the entire pressure port union. Proceed with installing a new oil seal through SST 09950-60010 (09951-00320) or SST 09950-70010 (09951-07100) while applying power steering fluid to its lip and carefully pressing it into position with the proper orientation. Position the vane pump shaft before installing two new pins into the front of the vane pump housing through a plastic hammering motion. Fit the cam ring facing outward then position the holes alongside straight pins before inserting the vane pump rotor that has its inscribed mark facing outward. The repair sequence begins with installing a new snap ring to the vane pump shaft before adding the 10 plates oriented with round faces pointing outward. A fresh gasket must be correctly positioned before installation of the front housing. Begin by aligning the straight pins in the vane pump side plate rear then install the wave washer followed by.experimental installation of 2 new O-rings using power steering fluid before fastening with 4 bolts that should be tightened to 24 Nm (240 kgf-cm, 17 ft. lbs.). Users should mount the pressure port union by inserting the spring in its proper orientation before applying power steering fluid to the new O-ring and afterward torque it to 83 Nm (850 kgf-cm, 61 ft. lbs.). Place power steering fluid on a new O-ring before installing it to the suction port union and tightening its bolt to 13 Nm (130 kgf-cm, 9 ft. lbs.). Use SST to prevent vane pump pulley rotation as you torque the new pulley set nut to 44 Nm (449 kgf-cm, 32 ft. lbs.). Test the rotation torque of the vane pump one more time to validate it is below 0.28 Nm (2.8 kgf-cm and 2.4 inch lbs.) prior to assembly installation. Secure the vane pump assembly with a Torx(R) socket (E10) by torquing the stud bolt to 22 Nm (224 kgf-cm, 16 ft. lbs.) and the 2 bolts and nut to 43 Nm (438 kgf-cm, 32 ft. lbs.). The belt tensioner needs to be turned counterclockwise to reinstall the vane pump V belt before installing the pressure feed tube using a union bolt with a new gasket torqued to 51 Nm (520 kgf-cm, 38 ft. lbs.). The final step involves attaching the oil reservoir to pump hose No.1 with clips. The procedure ends with reinstalling the air cleaner assembly followed by power steering fluid addition along with power steering fluid bleeding and leak inspections.