Power Steering Pump: Service and Repair

VANE PUMP

COMPONENTS (Part 1):

COMPONENTS (Part 2):

REMOVAL
1. REMOVE FRONT WHEEL RH
2. DRAIN POWER STEERING FLUID
3. REMOVE ENGINE UNDER COVER RH
4. REMOVE FAN AND GENERATOR V BELT





5. DISCONNECT OIL RESERVOIR TO PUMP HOSE NO. 1
(a) Remove the clip and disconnect the oil reservoir to pump hose No. 1.





6. DISCONNECT PRESSURE FEED TUBE ASSEMBLY
(a) Using SST, disconnect the pressure feed tube assembly.
SST 09023-12901
(b) Remove the bolt and disconnect the pressure feed tube clamp.
7. REMOVE VANE PUMP BRACKET REAR
(a) Remove the bolt and vane pump bracket rear.





8. REMOVE VANE PUMP ASSEMBLY
(a) Disconnect the oil pressure switch connector.
(b) Remove the 2 bolts, 2 nuts and vane pump assembly.

DISASSEMBLY

NOTICE: When using a vise, do not overtighten.





1. FIX VANE PUMP ASSEMBLY
(a) Using SST, hold the vane pump assembly in a vise.
SST 09630-00014 (09631-00132)
2. REMOVE POWER STEERING SUCTION PORT UNION
(a) Remove the bolt and power steering suction port union.
(b) Remove the O-ring from the power steering suction port union.





3. REMOVE FLOW CONTROL VALVE
(a) Remove the pressure port union.
(b) Remove the O-ring from the pressure port union.
(c) Remove the flow control valve and flow control valve compression spring.
4. REMOVE POWER STEERING OIL PRESSURE SWITCH

NOTICE: Be careful so that oil pressure switch is not dropped or strongly damaged, however if it is damaged replace it with a new one.





5. REMOVE VANE PUMP HOUSING REAR
(a) Remove the 4 bolts and vane pump housing rear from the vane pump housing front.
(b) Remove the O-ring from the vane pump housing front.





6. REMOVE WITH PULLEY SHAFT SUB-ASSEMBLY
(a) Using 2 screwdrivers, remove the snap ring from the with pulley shaft sub-assembly.
(b) Remove the with pulley shaft sub-assembly.
7. REMOVE VANE PUMP ROTOR
(a) Remove the 10 vane plates.
(b) Remove the vane pump rotor.
8. REMOVE VANE PUMP CAM RING





9. REMOVE VANE PUMP SIDE PLATE FRONT
(a) Remove the side plate front from the pump housing front.
(b) Remove the O-ring from the side plate front.





(c) Remove the O-ring from the pump housing front.





10. REMOVE VANE PUMP HOUSING OIL SEAL
(a) Using a screwdriver, remove the vane pump housing oil seal.

NOTICE: Be careful not to damage the pump housing front.

INSPECTION





1. INSPECT OIL CLEARANCE
(a) Using a micrometer and a caliper gauge, measure the oil seal clearance.
Maximum clearance: 0.043 mm (0.0017 inch)
If it is more than the maximum, replace the vane pump assembly.





2. INSPECT VANE PUMP ROTOR AND VANE PUMP PLATES
(a) Using a micrometer, measure the height, thickness and length of the vane plates.
Standard thickness: 1.405 to 1.411 mm (0.0553 to 0.0556 inch)





(b) Using a feeler gauge, measure the clearance between a side face of the vane pump rotor groove and vane plate.
Maximum clearance: 0.025 mm (0.0010 inch)
If it is more than the maximum, replace the vane pump assembly.





3. INSPECT FLOW CONTROL VALVE
(a) Coat the flow control valve with power steering fluid and check that it falls smoothly into the flow control valve hole by its own weight.
If it lacks smoothness, replace the vane pump assembly.





(b) Check the flow control valve for leakage. Close one of the holes and apply compressed air of 392 to 490 kPa (4 to 5 kgf-cm2, 57 to 71 psi), into the opposite side hole, and confirm that air does not come out from the end holes.
If necessary, replace the vane pump assembly.





4. INSPECT FLOW CONTROL VALVE COMPRESSION SPRING
(a) Using vernier calipers, measure the free length of the spring.
Minimum free length: 36.9 mm (1.453 inch)
If it is not within the specification, replace the vane pump assembly.
5. INSPECT PRESSURE PORT UNION
(a) If the union seat in the pressure port union is remarkably damaged and it may cause fluid leakage, replace the vane pump assembly.

REASSEMBLY

NOTICE: When installing, coat the parts indicated by arrows with power steering fluid.





1. INSTALL VANE PUMP HOUSING OIL SEAL
(a) Coat a new vane pump housing oil seal lip with power steering fluid.
(b) Using SST and a press, install a new vane pump housing oil seal.
SST 09950-60010 (09951-00280), 09950-70010 (09951-07100)

NOTICE: Make sure that the vane pump housing oil seal is installed facing in the correct direction.





2. INSTALL WITH PULLEY SHAFT SUB-ASSEMBLY
(a) Coat inside bushing surface of the vane pump housing front with power steering fluid.
(b) Gradually insert the vane pump shaft sub-assembly.

NOTICE: Do not damage the vane pump housing oil seal lip in the vane pump housing front.





3. INSTALL VANE PUMP SIDE PLATE FRONT
(a) Coat a new O-ring with power steering fluid and install it to the vane pump housing front.





(b) Coat a new O-ring with power steering fluid and install it to the side plate front.





(c) Align the dent of the vane pump side plate front with that of the vane pump housing front, and install the vane pump side plate front.

NOTICE: Make sure that the side plate front is installed facing in the correct direction.





4. INSTALL VANE PUMP CAM RING
(a) Align the dent of the cam ring with that of the side plate front, and install the cam ring with the inscribed mark facing outward.

NOTICE: Make sure that the cam ring is installed in the correct direction.





5. INSTALL VANE PUMP ROTOR
(a) Install the vane pump rotor with the inscribed mark facing outward.





(b) Coat 10 vane plates with power steering fluid.
(c) Install the vane plates with the round end facing outward.
(d) Using a snap ring expander, install a new snap ring to the w/ pulley shaft sub-assembly.





6. INSTALL VANE PUMP SHAFT SNAP RING
(a) Using a screwdriver and a snap ring expander, install a new snap ring to the with pulley shaft sub-assembly.





7. INSTALL VANE PUMP HOUSING REAR
(a) Coat a new O-ring with power steering fluid and install it to the pump housing rear.
(b) Align the straight pin of the vane pump housing rear with the dents of the vane pump cam ring, vane pump side plate front and vane pump housing front, and install the vane pump housing rear with the 4 bolts.
Torque: 22 Nm (220 kgf-cm, 16 ft. lbs.)





8. INSPECT PRELOAD
(a) Check that the pump rotates smoothly without abnormal noise.
(b) Temporarily install the service bolt.
Recommended service bolt:
Thread diameter: 10 mm (0.39 inch)
Thread pitch: 1.25 mm (0.0492 inch)
Bolt length: 50 mm (1.97 inch)
(c) Using a torque wrench, check the pump rotating torque.
Torque: Rotating torque 0.27 Nm (2.8 kgf-cm, 2.4 inch lbs.)
If rotating torque is not as specified, check the installation condition of each part.
9. INSTALL POWER STEERING OIL PRESSURE SWITCH
(a) Install the power steering oil pressure switch to the vane pump assembly.
Torque: 21 Nm (214 kgf-cm, 16 ft. lbs.)





10. INSTALL FLOW CONTROL VALVE
(a) Coat the flow control valve compression spring and flow control valve with power steering fluid.
(b) Install the flow control valve compression spring and flow control valve.
(c) Coat a new O-ring with power steering fluid and install it to the pressure port union.
(d) Install the pressure port union.
Torque: 69 Nm (704 kgf-cm, 51 ft. lbs.)
11. INSTALL POWER STEERING SUCTION PORT UNION
(a) Coat a new O-ring with power steering fluid, and install it to the power steering suction port union.
(b) Install the power steering suction port union with the bolt.
Torque: 12 Nm (122 kgf-cm, 9 ft. lbs.)

INSTALLATION

NOTICE: When installing, coat the parts indicated by arrows with power steering fluid.





1. INSTALL VANE PUMP ASSEMBLY
(a) Install the vane pump assembly with the 2 bolts and nuts.
Torque: 37 Nm (377 kgf-cm, 27 ft. lbs.)
(b) Connect the oil pressure switch connector.

NOTICE: Be careful that the oil does not adhere to the connector.





2. INSTALL PRESSURE FEED TUBE ASSEMBLY
(a) Using SST, connect the pressure feed tube assembly.
SST 09023-12901
Torque: 41 Nm (418 kgf-cm, 30 ft. lbs.)

NOTICE: Use a torque wrench with a fulcrum length of 345 mm (13.58 inch).

HINT: This torque value is effective when SST is parallel to a torque wrench.

(b) Connect the pressure feed tube clamp with the bolt.
Torque: 7.8 Nm (80 kgf-cm, 69 inch lbs.)





3. CONNECT OIL RESERVOIR TO PUMP HOSE NO. 1
(a) Connect the oil reservoir to pump hose No. 1 with the clip.
4. INSTALL FAN AND GENERATOR V BELT
5. ADD POWER STEERING FLUID
6. BLEED POWER STEERING FLUID
7. INSPECT FOR POWER STEERING FLUID LEAK
8. INSTALL ENGINE UNDER COVER RH
9. INSTALL FRONT WHEEL RH
Torque: 103 Nm (1,050 kgf-cm, 76 ft. lbs.)