OEM 2000 Toyota Tundra Power Steering Pump

2000 Toyota Tundra Parts Questions & Experts Answers

• Q: How to service and repair the power steering pump on 2000 Toyota Tundra?

  A: When servicing power steering pumps start with measuring the vaned pump torque because it should exhibit smooth rotation without any unusual noise. Examine the rotating torque using a torque wrench to verify that it stays below 0.28 Nm at 2.8 kgf-cm or 2.4 inch lbs. Proceed to remove the suction port union by disassembling the bolt together with its O-ring and then move forward with the pressure port union followed by the flow control valve and spring and ensure the O-ring from the pressure port union separates alongside the other components. Detaching the rear housing requires removal of 4 bolts; you should lightly use a plastic hammer to unmold wave washers and side plates when they are stuck. Separate the rear housing O-rings while extracting the wave washer and side plate followed by the gasket along with cam ring and vane plates and vane pump rotor since plate drop must be avoided. Remove the vane pump shaft along with vane pump pulley and 2 straight pins out from the front housing. A micrometer alongside a caliper gauge aids inspection of vane pump shaft to bushing oil clearance during which you must check for standard 0.03-0.05 mm (0.0012-0.0020 inch) and maximum 0.07 mm (0.0028 inch) clearance levels; replacing shaft and front housing arises if maximum limits are exceeded. The minimum dimensional specifications of the vane pump rotor and vane plates include height 8.6 mm (0.339 inch) and thickness 1.397 mm (0.0550 inch) and length 14.991 mm (0.5902 inch). Use the feeler gauge to check the maximum 0.033 mm (0.0013 inch) clearance between the rotor groove and plate; replace the defective parts if necessary. Check the flow control valve by coating it with power steering fluid and ensuring it falls smoothly into the valve hole, then test for leakage by applying compressed air at 392-490 kPa (4-5 kgf/cm2, 57-71 psi) and confirming no air escapes from the end holes; replace the valve if needed with one that has the same inscribed mark: A, B, C, D, E, or F. Measure the free length of the spring with vernier calipers, ensuring it is at least 33.2 mm (1.307 inch) and replace if it does not meet this specification. To replace the oil seal gently remove it with a screwdriver wrapped in vinyl tape and lubricate a new oil seal lip with power steering fluid before using Special Service Tools 09950-60010 (09951-00330), 09950-70010 (09951-07100) to install the new oil seal correctly. Reassembly requires power steering fluid coating the specified parts followed by installing the vane pump shaft with the pulley along with tapping two new straight pins using a plastic hammer. Set up the cam ring with its inscribed mark facing outward and secure the opposite side by installing the vane pump rotor which must have its inscribed mark pointing in the same direction using a new snap ring. Begin by adding 10 vane plates which should expose the round ends to the exterior and include a new gasket mounted on the front housing where correct gasket positioning matters. Secure the side plate to its holes and straight pins before putting in the wave washer whose protrusions match the side plate slots. Place new O-rings with power steering fluid coating on the rear housing then fasten it with the 4 bolts torqued to 24 Nm (240 kgf-cm, 17 ft. lbs.). The installation process begins by appropriately positioning the flow control valve along with its spring and pressure port union while applying power steering fluid to the new O-ring; finally, tighten the union to 83 Nm (850 kgf-cm and 61 ft. lb torques). The final step includes lubricating a new O-ring with power steering fluid before installation at the suction port union where a bolt torque should be set to 13 Nm (130 kgf-cm, 9 ft. lbs.). Measure PS vane pump rotating torque.