Power Steering Pump: Service and Repair

POWER STEERING OIL PUMP





COMPONENTS

REMOVAL





1. Disconnect the pressure hose from the oil pump, disconnect the suction hose from the suction pipe, and drain the oil.
2. Loosen the power steering tension adjusting bolt or flange nut.
3. Separate the belt from the power steering oil pump pulley.





4. Loosen the power steering oil pump mounting bolt, and then remove the power steering oil pump assembly.
5. Remove the power steering oil pump mounting bracket.

DISASSEMBLY





1. Remove the two bolts (12 mm) from oil pump body, and then remove the suction pipe and O-ring.
2. Remove the four bolts (14 mm), and then remove the rear cover assembly.
3. Remove the snap ring.
4. Remove the rotor and the vane.
5. Remove the oil pump side plate.





6. Remove the inner and outer O-ring.

NOTE: When assembling, use an O-ring.





7. Tap the rotor side of the shaft slightly with a plastic hammer to remove the shaft.





8. Remove the oil seal from the oil pump body.

NOTE: When assembling, use a new oil seal.

9. Remove the connector from the oil pump body, and take out the flow control valve and the flow control spring.





10. Remove the O-ring from the connector.

CAUTION: Do not disassemble the flow control valve.

INSPECTION

NOTE: Replace the pump assembly if necessary.





1. Check the front and rear pump bodies for cracking or other damage and for abnormal wear of the moving surface of the rotor.
2. Check the moving surface of the cam ring's vanes for abnormal wear.
3. Check the moving surface of the side plate and the pump bodies for abnormal wear.
4. Check the moving surface of the vane cam ring for abnormal wear.





5. Check the clearance of the rotor and vanes.
6. Check the control valve for cracking and other damage, for clogging, and for abnormal wear of the moving part.





7. Check the spring for damage.

REASSEMBLY





1. Install the flow control spring the flow control valve and the connector in to the pump body





2. Install the oil seal in the pump body by using the special tool.
3. After inserting the shaft assembly into the pump body.
4. Install the outer and inner O-ring in the pump body.





5. Insert the oil pump side plate in the pump body.





6. Install the rotor to the shaft with the rotor's identification mark facing upward.





7. Install the cam ring so that its identification mark is facing downward.





8. Install the vanes (10 pieces) to the rotor, with the R part of the vanes facing outward.
9. Install the O-ring and oil pump cover assembly.





10. Install the suction pipe and O-ring.

INSTALLATION





1. After installing the oil pump to the oil pump bracket.
Tightening torque: 18 - 23 Nm (1.8 - 2.3 kg-m, 13 - 16 ft. lbs.)





2. Install the belt and tighten the bolt adjusting tension to the specified torque.
3. Install the suction hose.

CAUTION: Install the pressure hose to the oil pump.





4. Install the pressure hose to the oil pump.

NOTE: Install the pressure hose being careful so that it does not twist and come in contact with other components.

5. Add power steering fluid (PSF-III).
6. Air bleed the system.
7. Check the oil pump pressure.