Power Steering Pump: Service and Repair

VANE PUMP

COMPONENTS (Part 1):

COMPONENTS (Part 2):

REMOVAL
1. DRAIN POWER STEERING FLUID
2. REMOVE FRONT WHEEL RH
3. REMOVE FRONT FENDER APRON SEAL RH
4. REMOVE COOL AIR INTAKE DUCT SEAL
5. REMOVE ENGINE ROOM SIDE COVER LH
6. REMOVE ENGINE ROOM SIDE COVER RH
7. REMOVE V-BANK COVER SUB-ASSEMBLY





8. REMOVE FAN AND GENERATOR V BELT
9. DISCONNECT NO. 1 FLUID RESERVOIR TO PUMP HOSE
(a) Slide the clip and disconnect the No. 1 fluid reservoir to pump hose from the vane pump assembly.





10. DISCONNECT PRESSURE FEED TUBE ASSEMBLY
(a) Remove the union bolt and disconnect the pressure feed tube assembly from the vane pump assembly.
(b) Remove the bolt and separate pressure feed tube clamp.
(c) Remove the gasket from the pressure feed tube assembly.





11. DISCONNECT POWER STEERING FLUID PRESSURE SWITCH CONNECTOR
(a) Disconnect the power steering fluid pressure switch connector.





12. REMOVE VANE PUMP ASSEMBLY
(a) Using SST, loosen the bolt (A) and remove bolt (B), and then remove the vane pump assembly.
SST 09249-63010





(b) Remove the bolt from the vane pump assembly.

DISASSEMBLY





1. HOLD 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 the power steering suction port union from the vane pump assembly.
(b) Using a screw driver, remove the O-ring from the power steering suction port union.





3. REMOVE POWER STEERING FLUID PRESSURE SWITCH
(a) Remove the power steering fluid pressure switch from the vane pump assembly.

NOTICE: Perform this procedure only when the power steering fluid pressure switch is replaced.





4. REMOVE FLOW CONTROL VALVE ASSEMBLY
(a) Remove the pressure port union.
(b) Remove the O-ring from the pressure port union.
(c) Remove the flow control valve assembly and the flow control valve compression spring.





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





(b) Using a screwdriver, remove the O-ring from the vane pump rear housing.

HINT: Tape the screwdriver tip before use.





6. REMOVE VANE PUMP SHAFT WITH PULLEY
(a) Using 2 screwdrivers, remove the vane pump shaft snap ring from the vane pump shaft with pulley.
(b) Remove the vane pump shaft with pulley.





7. REMOVE VANE PUMP ROTOR
(a) Remove the 10 vane pump plates.
(b) Remove the vane pump rotor.





8. REMOVE VANE PUMP CAM RING
(a) Remove the vane pump cam ring from the vane pump front housing.





9. REMOVE VANE PUMP FRONT SIDE PLATE
(a) Remove the vane pump front side plate from the vane pump front housing.





(b) Using a screwdriver, remove the O-ring from the vane pump front side plate.

HINT: Tape the screwdriver tip before use.





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





10. REMOVE VANE PUMP HOUSING OIL SEAL
(a) Using a screwdriver and a shop rag or a piece of cloth, remove the vane pump housing oil seal.

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

INSPECTION





1. INSPECT VANE PUMP SHAFT AND BUSHING IN VANE PUMP FRONT HOUSING
(a) Using a micrometer, measure the outer diameter of the vane pump shaft with pulley [a].
(b) Using vernier calipers, measure the inner diameter of the vane pump front housing bushing [b].
(c) Calculate the oil clearance. Oil clearance = Inner diameter of the bushing [b] - Outer diameter of the shaft [a].
Maximum oil clearance: 0.07 mm (0.0028 in.)

If the oil clearance exceeds the maximum, replace the vane pump assembly.





2. INSPECT VANE PUMP ROTOR AND VANE PUMP PLATE CLEARANCE
(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 in.)

If the thickness is not within the specified range, replace the vane pump assembly.





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

If the clearance exceeds the maximum, replace the vane pump assembly.





3. INSPECT FLOW CONTROL VALVE ASSEMBLY
(a) Coat the flow control valve assembly with power steering fluid and check that it falls smoothly into the flow control valve due to its own weight.

If the control valve does not fall into the hole smoothly, replace the vane pump assembly.





(b) Check the flow control valve assembly for leakage. Close one of the holes and apply compressed air, 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 air leaks, replace the vane pump assembly.





4. INSPECT FLOW CONTROL VALVE COMPRESSION SPRING
(a) Using vernier calipers, measure the free length of the flow control valve compression spring.
Minimum free length: 29.2 mm (1.150 in.)

If the length is less than the minimum, replace the vane pump assembly.

5. INSPECT PRESSURE PORT UNION
If the union seat in the pressure port union is damaged, it may cause fluid leakage. In this case, replace the vane pump assembly.





6. INSPECT TOTAL 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 in.)
Thread pitch: 1.25 mm (0.0492 in.)
Bolt length: 50 mm (1.97 in.)
(c) Using a torque wrench, check the pump rotating torque.
Rotating torque: 0.27 N*m (2.8 kgf*cm, 2.4 in.*lbf) or less

If the rotating torque is not as specified, check the vane pump housing oil seal.

REASSEMBLY

NOTICE: When installing parts, 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 the vane pump housing oil seal until it is flush with the vane pump front housing end surface.
SST 09950-60010 (09951-00280), 09950-70010 (09951-07100)

NOTICE: Make sure that the oil seal is installed facing in the correct direction as shown in the illustration.





2. INSTALL VANE PUMP SHAFT WITH PULLEY
(a) Coat the inside surface of the bushing in the vane pump front housing with power steering fluid.
(b) Gradually insert the vane pump shaft with pulley.

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

HINT: Wrap protective tape around the spline of the vane pump shaft with pulley in order to prevent damage to the oil seal.





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





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





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

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





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

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





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

HINT: Vane pump rotor can be installed in both directions.

(b) Coat the 10 vane pump plates with power steering fluid.





(c) Install the vane pump plates with the round end facing outward.

NOTICE: Make sure that the vane pump plates are installed facing in the correct direction.





6. INSTALL VANE PUMP SHAFT SNAP RING
(a) Using a screwdriver and a snap ring expander, install a new vane pump shaft snap ring onto the vane pump shaft with pulley.

NOTICE: Make sure that the vane pump shaft snap ring is securely installed in the vane pump shaft groove.





7. INSTALL VANE PUMP REAR HOUSING
(a) Coat a new O-ring with power steering fluid and install it onto the vane pump rear housing.





(b) Align the straight pin of the vane pump rear housing with the notches of the vane pump cam ring, vane pump front side plate, and vane pump front housing.





(c) Install the vane pump rear housing with the 4 bolts.
Torque: 22 N*m (224 kgf*cm, 16 ft.*lbf)

8. INSPECT TOTAL PRELOAD





9. INSTALL FLOW CONTROL VALVE ASSEMBLY
(a) Coat the flow control valve assembly with power steering fluid.
(b) Install the flow control valve compression spring and the flow control valve assembly to the vane pump front housing.
(c) Coat a new O-ring with power steering fluid and install it onto the pressure port union.
(d) Install the pressure port union to the vane pump front housing.
Torque: 69 N*m (704 kgf*cm, 51 ft.*lbf)

10. INSTALL POWER STEERING FLUID PRESSURE SWITCH
(a) Coat the new O-ring attached to the new power steering fluid pressure switch with power steering fluid.





(b) Install the power steering fluid pressure switch to the vane pump assembly.
Torque: 21 N*m (214 kgf*cm, 16 ft.*lbf)

NOTICE: Do not use a power steering fluid pressure switch that has been subjected an impact; for example, due to it having been dropped.

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 to the vane pump assembly with the bolt.
Torque: 12 N*m (122 kgf*cm, 9 ft.*lbf)

INSTALLATION





1. INSTALL VANE PUMP ASSEMBLY
(a) Temporarily install the bolt to the vane pump assembly.
(b) Install the vane pump assembly.





(c) Using SST, install bolt (B) and tighten the 2 bolts.
SST 09249-63010
Torque: Without SST 43 N*m (439 kgf*cm, 32 ft.*lbf)
With SST 29 N*m (294 kgf*cm, 21 ft.*lbf)

NOTICE:
^ Use a torque wrench with a fulcrum length of 300 mm (11.81 in.).
^ This torque value is accurate when SST is parallel to the torque wrench.





2. CONNECT POWER STEERING FLUID PRESSURE SWITCH CONNECTOR
(a) Connect the connector to the power steering fluid pressure switch.

3. CONNECT PRESSURE FEED TUBE ASSEMBLY
(a) Install a new gasket to the pressure feed tube assembly.





(b) Temporarily connect the pressure feed tube assembly to the vane pump assembly with the union bolt.
(c) Install the pressure feed tube assembly clamp with the bolt.
Torque: 9.8 N*m (100 kgf*cm, 87 in.*lbf)

NOTICE: Install the pressure feed tube assembly clamp in the correct position.

(d) Fully tighten the union bolt.
Torque: 50 N*m (510 kgf*cm, 37 ft.*lbf)

NOTICE: Make sure that the stopper of the pressure feed tube assembly contacts the vane pump assembly securely as shown in the illustration.





4. CONNECT NO. 1 FLUID RESERVOIR TO PUMP HOSE
(a) Connect the No. 1 fluid reservoir to pump hose to the vane pump assembly with the clip.

NOTICE:
^ Connect the No. 1 fluid reservoir to pump hose with the paint mark facing toward the rear of the vehicle.
^ Install the No. 1 fluid reservoir to pump hose as far as it will go as shown in the illustration.
^ Install the clip at the position specified in the illustration.

5. INSTALL FAN AND GENERATOR V BELT
6. ADD POWER STEERING FLUID
7. BLEED POWER STEERING FLUID
8. CHECK POWER STEERING FLUID LEVEL
9. CHECK FOR POWER STEERING FLUID LEAKS
10. INSTALL V-BANK COVER SUB-ASSEMBLY
11. INSTALL ENGINE ROOM SIDE COVER RH
12. INSTALL ENGINE ROOM SIDE COVER LH
13. INSTALL COOL AIR INTAKE DUCT SEAL
14. INSTALL FRONT FENDER APRON SEAL RH
15. INSTALL FRONT WHEEL RH
Torque: 103 N*m (1,050 kgf*cm, 76 ft.*lbf)