Power Steering Pump: Service and Repair

VANE PUMP

COMPONENTS:

REMOVAL
1. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY RH
2. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY LH
3. REMOVE HOOD TO COWL TOP SEAL
4. REMOVE COWL TOP VENTILATOR LOUVER RH
5. REMOVE COWL TOP VENTILATOR LOUVER LH
6. REMOVE WINDSHIELD WIPER LINK ASSEMBLY
7. REMOVE COWL PANEL SUB-ASSEMBLY
8. REMOVE VANE PUMP OIL RESERVOIR COVER
9. DRAIN POWER STEERING FLUID
10. REMOVE FRONT WHEEL RH
11. REMOVE ENGINE UNDER COVER RH

12. DISCONNECT PRESSURE FEED TUBE ASSEMBLY
a) Using SST, disconnect the pressure feed tube from the vane pump.
SST 09023-12701
b) Slide the clip and disconnect the return hose.

NOTICE: Take care not to spill fluid on the V belt.

c) Disconnect the oil pressure sensor connector.
13. REMOVE REAR VANE PUMP STAY
a) Remove the bolt, stay and heat insulator.

14. REMOVE VANE PUMP ASSEMBLY
a) Remove bolts B and C, and the adjusting strut.
b) Loosen bolt A sufficiently so that the vane pump can be removed.

HINT: Bolt A cannot be removed.

DISASSEMBLY

1. FIX VANE PUMP ASSEMBLY
a) Using SST, secure the vane pump in a vise.
SST 09630-00014 (09631-00132)
2. REMOVE VANE PUMP OIL RESERVOIR CAP SUB-ASSEMBLY
3. REMOVE VANE PUMP OIL RESERVOIR ASSEMBLY
a) Remove the 3 bolts and oil reservoir.
b) Remove the O-ring from the oil reservoir.
4. REMOVE FRONT PUMP BRACKET
a) Remove the 2 bolts, front bracket and rear bracket.

5. 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 compression spring.
6. REMOVE POWER STEERING OIL PRESSURE SENSOR
a) Remove the oil pressure sensor from the front housing.

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

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

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

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

12. REMOVE VANE PUMP HOUSING OIL SEAL
a) Using a screwdriver and cloth, remove the housing oil seal.

NOTICE: Be careful not to damage the housing front.

INSPECTION

1. INSPECT FRONT VANE PUMP SHAFT AND BUSH IN HOUSING
a) Using a micrometer and caliper gauge, measure the oil clearance.
Maximum clearance: 0.07 mm (0.0028 inch) or less
If the clearance is greater than the maximum, replace the vane pump.

2. INSPECT VANE PUMP ROTOR AND VANE PUMP PLATES
a) Using a micrometer, measure the thickness of the vane pump plates.
Standard thickness: 1.405 to 1.411 mm (0.05531 to 0.05555 inch)

b) Using a feeler gauge, measure the clearance between a side face of the vane pump rotor groove and the vane plates.
Maximum clearance: 0.03 mm (0.0012 inch)
If the clearance exceeds the maximum, replace the vane pump.

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 under its own weight.
If necessary, replace the vane pump.

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.

4. INSPECT FLOW CONTROL VALVE COMPRESSION SPRING
a) Using a vernier caliper, measure the free length of the compression spring.
Minimum free length: 29.2 mm (1.150 inch)
If the length is less than the minimum, replace the vane pump.
5. INSPECT PRESSURE PORT UNION
If the union seat in the pressure port union is severely damaged, it may cause fluid leakage. In that case, replace the vane pump assembly.

REASSEMBLY

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

NOTICE: Make sure that the oil seal is installed correctly.

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

NOTICE: Be careful not to damage the lip of the oil seal.

HINT: Wrap the shaft with vinyl tape before inserting.

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

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

c) Align the dent of the front side plate with that of the front housing and install them.

NOTICE: Make sure that the front side plate is installed correctly.

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

5. INSTALL VANE PUMP ROTOR
a) Install the vane pump rotor.

b) Apply power steering fluid to the 10 vane pump plates.
c) Install the vane pump plates with the round end facing outward.

6. INSTALL VANE PUMP SHAFT SNAP RING
a) Using a screwdriver and snap ring expander, install a new snap ring to the shaft.

7. INSTALL REAR VANE PUMP HOUSING
a) Apply power steering fluid to a new O-ring and install it to the rear housing.
b) Align the straight pin of the rear housing with the dents of the cam ring, the front side plate and the front housing, and install the rear housing with the 4 bolts.
Torque: 22 Nm (224 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.
Standard rotating torque: 0.27 Nm (2.8 kgf-cm, 2.4 inch lbs.) or less
If the rotating torque is not as specified, check the installation of the housing oil seal.
9. INSTALL POWER STEERING OIL PRESSURE SENSOR
a) Apply power steering fluid to a new O-ring and install it to the oil pressure sensor.
b) Install the oil pressure sensor to the front housing.
Torque: 21 Nm (214 kgf-cm, 15 ft. lbs.)

10. INSTALL FLOW CONTROL VALVE
a) Apply power steering fluid to the compression spring and flow control valve.
b) Install the compression spring and the flow control valve.
c) Apply power steering fluid to a new O-ring 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 FRONT PUMP BRACKET
a) Install the front bracket and rear bracket with the 2 bolts.
12. INSTALL VANE PUMP OIL RESERVOIR ASSEMBLY
a) Apply power steering fluid to a new O-ring and install it to the oil reservoir.
b) Install the oil reservoir to the front housing with the 3 bolts.
Torque: 9.0 Nm (92 kgf-cm, 80 inch lbs.)
13. INSTALL VANE PUMP OIL RESERVOIR CAP SUB-ASSEMBLY

INSTALLATION

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

1. INSTALL VANE PUMP ASSEMBLY
a) Temporarily install the vane pump with bolt A.

HINT: After adjusting the V belt tension, torque the bolt.

b) Install the adjusting strut with bolt B.
Torque: 44 Nm (449 kgf-cm, 32 ft. lbs.)
c) Temporarily install bolt C.

HINT: After adjusting the V belt tension, torque the bolt.

2. INSTALL REAR VANE PUMP STAY
a) Install the rear stay to the rear housing, as shown in the illustration.

b) Install the heat insulator and rear stay with the bolt.
Torque: 44 Nm (449 kgf-cm, 32 ft. lbs.)

NOTICE: Install the heat insulator by pressing its projection into a hole in the rear bracket, as shown in the illustration.

3. CONNECT PRESSURE FEED TUBE ASSEMBLY
a) Using SST, connect the pressure feed tube.
Torque: 41 Nm (414 kgf-cm, 30 ft. lbs.)
SST 09023-12701

HINT:
^ Use a torque wrench with a fulcrum length of 345 mm (13.58 inch).
^ This torque value is effective when SST is parallel to a torque wrench.

b) Check that the pressure feed tube is properly installed to the rear stay.
c) Connect the return hose with the clip.

NOTICE: Take care not to spill fluid on the V belt.

d) Connect the oil pressure sensor connector.
4. ADJUST VANE PUMP V BELT
5. INSPECT DRIVE BELT DEFLECTION AND TENSION
6. ADD POWER STEERING FLUID
a) Add power steering fluid.
7. BLEED AIR FROM POWER STEERING SYSTEM
a) Bleed air from the power steering system.
8. CHECK FOR POWER STEERING FLUID LEAKS
9. INSTALL ENGINE UNDER COVER RH
10. INSTALL FRONT WHEEL RH
Torque: 103 Nm (1,050 kgf-cm, 76 ft. lbs.)
11. CHECK POWER STEERING FLUID LEVEL IN RESERVOIR
12. INSTALL VANE PUMP OIL RESERVOIR COVER
13. INSTALL COWL PANEL SUB-ASSEMBLY
14. INSTALL WINDSHIELD WIPER LINK ASSEMBLY
15. INSTALL COWL TOP VENTILATOR LOUVER LH
16. INSTALL COWL TOP VENTILATOR LOUVER RH
17. INSTALL HOOD TO COWL TOP SEAL
18. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY LH
19. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY RH