Toyota Tundra. Manual — part 2686

Fig. 38: Removing Vane Pump Housing Oil Seal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION

1. INSPECT VANE PUMP SHAFT AND BUSH IN VANE PUMP FRONT HOUSING

a. Using a micrometer, measure the outer diameter [a] of the vane pump shaft.

Fig. 39: Measuring Outer Diameter Of Vane Pump Shaft
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Using a vernier caliper, measure the inner diameter [b] of the vane pump front housing bush.

c. Calculate the oil clearance.

Oil clearance = Inner diameter of the bush [b] -Outer diameter of the shaft [a]

Maximum oil clearance: 0.07 mm (0.00276 in.)

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

2. INSPECT VANE PUMP ROTOR AND VANE PUMP PLATE

a. Using a micrometer, measure the thickness of the vane pump plates.

NOTE:

Be careful not to damage the front housing.

2009 Toyota Tundra

2009 STEERING Power Steering - Tundra

Fig. 40: Measuring Thickness Of Vane Pump Plates
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard thickness: 1.405 to 1.411 mm (0.0553 to 0.0556 in.)

If the thickness is not as specified, 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 plate.

Fig. 41: Measuring Clearance Between Side Face Of Vane Pump Rotor Groove And Vane
Pump Plates
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Maximum clearance: 0.03 mm (0.00118 in.)

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

3. INSPECT FLOW CONTROL VALVE ASSEMBLY

a. Coat the flow control valve with power steering fluid and check that it falls smoothly into the flow

control valve by its own weight.

2009 Toyota Tundra

2009 STEERING Power Steering - Tundra

Fig. 42: Installing Flow Control Valve
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

If the control valve does not fall into the hole smoothly, 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 (4.0 to 5.0 kgf/cm

2

, 57 to 71 psi) into the opposite side hole, and confirm that air does

not come out from the end holes.

Fig. 43: Checking Flow Control Valve For Leakage
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

If air leaks, replace the vane pump assembly.

4. INSPECT FLOW CONTROL VALVE COMPRESSION SPRING

a. Using a vernier caliper, measure the free length of the compression spring.

Fig. 44: Measuring Free Length Of Compression Spring
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 STEERING Power Steering - Tundra

Minimum free length: 29.2 mm (1.15 in.)

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

5. INSPECT PRESSURE PORT UNION

a. Visually check the pressure port union for fluid leaks. If there is a leak, 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 (0.394 in.)

Thread pitch: 1.25 mm (0.0492 in.)

Bolt length: 50 mm (1.97 in.)

c. Using a torque wrench, measure the pump rotating torque.

Fig. 45: Checking Pump Rotating Torque
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard rotating torque: 0.3 N*m (3 kgf*cm, 2 in.*lbf) or less

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

REASSEMBLY

1. INSTALL VANE PUMP HOUSING OIL SEAL

a. Coat the lip of a new oil seal with power steering fluid.

b. Using SST and a press, press in the oil seal.

NOTE:

When installing parts, coat the parts indicated by arrows with power steering
fluid (see VANE PUMP (FOR 1GR-FE) ).

2009 Toyota Tundra

2009 STEERING Power Steering - Tundra