Power Steering Pump: Service and Repair

VANE PUMP

COMPONENTS (Part 1):

COMPONENTS (Part 2):

REMOVAL

NOTICE:
^ Do not overtighten when using a vise.
^ When installing, coat the parts indicated by arrows with power steering fluid.
^ Take care not to spill power steering fluid on the V belt.

1. REMOVE FRONT WHEEL RH
2. DRAIN POWER STEERING FLUID
3. REMOVE FRONT FENDER APRON SEAL 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) Remove the union bolt and disconnect the pressure feed tube assembly from the vane pump assembly.
(b) Remove the bolt and separate the pressure feed tube assembly clamp.
(c) Remove the gasket from the pressure feed tube assembly.





7. REMOVE VANE PUMP ASSEMBLY
(a) Disconnect the connector from the power steering oil pressure switch.





(b) Remove the 2 bolts and the vane pump assembly.

DISASSEMBLY





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 the power steering suction port union from the vane pump assembly.
(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 the compression spring.
4. REMOVE POWER STEERING OIL PRESSURE SWITCH
(a) Remove the power steering oil pressure switch from the vane pump housing front.
(b) Using a screwdriver, remove the O-ring from the power steering oil pressure switch.

NOTICE: If the oil power steering oil pressure switch is dropped or damaged, replace it with a new one.





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





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





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





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

INSPECTION





1. INSPECT VANE PUMP SHAFT
(a) Using a micrometer and a caliper gauge, measure the oil clearance.
Maximum clearance: 0.07 mm (0.0028 in.)
If clearance exceeds the maximum, replace the vane pump assembly.





2. INSPECT VANE PUMP ROTOR
(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.)





(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 in.)
If clearance exceeds 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 under 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, 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 compression spring.
Minimum free length: 36.9 mm (1.453 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 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 a new vane pump housing oil seal lip with power steering fluid.
(b) Using SST and a press, install the oil seal.
SST 09950-60010 (09951-00280), 09950-70010 (09951-07100)

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





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

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





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





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

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





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

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





5. INSTALL VANE PUMP ROTOR
(a) Coat the vane pump rotor with power steering fluid.
(b) Install the vane pump rotor.

HINT: Vane pump rotor has no specific direction.





(c) Coat the 10 vane pump plates with power steering fluid.
(d) Install the vane pump plates with the round end facing outward.





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





7. INSTALL VANE PUMP HOUSING REAR
(a) Coat a new O-ring with power steering fluid and install it onto the vane 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 the vane pump housing front, and install the vane pump housing rear with the 4 bolts.
Torque: 22 N*m (224 kgf*cm, 16 ft.*lbf)





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 in.)
Thread pitch: 1.25 mm (0.0492 in.)
Bolt length: 50 mm (1.97 in.)
(c) Using a torque wrench, check the pulley rotating torque.
Torque:
Rotating torque 0.27 N*m (2.8 kgf*cm, 2.4 ft.*lbf) or less
If rotating torque is not as specified, check the installation condition of each part.
9. INSTALL POWER STEERING OIL PRESSURE SWITCH
(a) Coat a new O-ring with power steering fluid, and install it to the suction port union.
(b) Install the power steering oil pressure switch onto the vane pump assembly.
Torque: 21 N*m (214 kgf*cm, 16 ft.*lbf)





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





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 N*m (122 kgf*cm, 9 ft.*lbf)

INSTALLATION





1. INSTALL VANE PUMP ASSEMBLY
(a) Install the vane pump assembly with the 2 bolts.
Torque: 43 N*m (439 kgf*cm, 32 ft.*lbf)





(b) Connect the connector to the power steering oil pressure switch.





2. CONNECT PRESSURE FEED TUBE ASSEMBLY
(a) Install a new gasket to the pressure feed tube assembly.
(b) Connect the pressure feed tube assembly to the vane pump assembly with the union bolt
Torque: 52 N*m (525 kgf*cm, 38 ft.*lbf)

HINT: Make sure that the stopper of the pressure feed tube assembly contacts the vane pump assembly as shown in the illustration, then tighten the union bolt.

(c) Install the pressure feed tube clamp with the bolt.
Torque: 9.8 N*m (100 kgf*cm, 87 in.*lbf)





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. INSTALL FRONT FENDER APRON SEAL RH
6. INSTALL FRONT WHEEL RH
7. BLEED POWER STEERING FLUID
8. INSPECT FOR POWER STEERING FLUID