OEM 2001 Toyota 4Runner Power Steering Pump

2001 Toyota 4Runner Power Steering Pump Parts Q&A

• Q: How to service and repair the power steering pump on 2001 Toyota 4Runner?

  A: The PS vane pump rotating torque needs to be measured and it requires smooth operation without any strange noises while maintaining a maximum torque of 0.27 Nm (2.8 kgf-cm, 2.4 inch lbs.). Remove the vane pump pulley with Special Service Tool: 09960-10010 (incl. 09962-01000 and 09963-01000) to stop the pulley from rotating then loosen and remove the nut and pulley. The service starts with unfastening the oil reservoir by disassembling its three bolts and O-ring. By performing the subsequent removal of the pressure port union and flow control valve and spring then bracket and rear housing while collecting the two O-rings from the rear housing. Start the process by removing the wave washer together with the side plate and gasket as well as the cam ring and vane plates and vane pump rotor while being mindful to prevent vane plates from falling. Pull out the vane pump shaft together with the two straight pins installed on the front housing. Measure the vane pump shaft bushing and shaft clearance with a micrometer and caliper gauge for inspection purposes according to specifications and replace the shaft if the clearance reaches 0.07 mm (0.0028 inch). The vane pump rotor and vane plates must be measured for height, thickness and length where minimum measurements are 8.6 mm (0.339 inch), 1.397 mm (0.0550 inch) and 14.991 mm (0.5902 inch) respectively. Check the vane pump rotor groove and vane plate clearance which should not surpass 0.035 mm (0.0014 inch) and obtain replacement parts bearing matching mark stamps (1, 2, 3, 4, or None) on the cam ring. Power steering dealers should evaluate the flow control valve by dipping it in power steering fluid then the valve should descend easily into the hole. They should also test for leaks using compressed air pressure between 392 - 490 kPa (4 - 5 kgf/cm2, 57 - 71 psi). Valve replacement is needed when using parts stamped A, B, C, D, E or F. Spring measurement with vernier calipers should show at least 33.2 mm (1.307 inch) of free length before replacement for specifications. Use a screwdriver with a vinyl tape restraining its tip to remove the old oil seal before coating a new one's lip with power steering fluid while using Special Service Tool: 09950-60010 (09951-00330), 09950-70010 (09951-07100) to properly install the seal in its correct direction. You should start by coating power steering fluid onto the specified components before you install new straight pins using a plastic hammer into the front housing. Afterward install the vane pump shaft followed by the cam ring (facing outward) and the vane pump rotor (facing outward) before placing a new snap ring. Place the 10 vane plates with facing round surfaces outwards while installing a new gasket on the front housing prior to aligning the side plate with straight pins. Fit the wave washer by inserting its protruding portions into side plate slots and install the rear housing with 2 new O-rings applied with power steering fluid before securing with 2 bolts at 24 Nm (240 kgf-cm / 17 ft. lbs.). Secure the spring followed by the flow control valve (positioned properly) and pressure port union which feature a new O-ring that received power steering fluid coating then tighten the union to 83 Nm (850 kgf-cm, 62 ft. lbs.). Begin the installation sequence by fastening the bracket with two bolts which should be tightened to 43 Nm (440 kgf-cm, 32 ft. lbs.). Then continue with the oil reservoir installation using a new O-ring coated with power steering fluid while securing the assembly with three bolts, front side bolt has a recommended torque setting of 13 Nm (130 kgf-cm, 9 ft. lbs.) and rear side bolts need 24 Nm (240 kgf-cm, 17 ft. lbs.). The vane pump pulley assembly goes next accompanied by the Special Service Tools 09960-10010 (09962-01000, 09963-01000) to halt pulley movement so the nut receives a torque of 43 Nm (440 kgf-cm, 32 ft. lbs.). Measure the PS vane pump rotating torque at this time.