2007 TOYOTA SIENNA Steering

POWER STEERING – VANE PUMPPS–13
PS
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 from
the vane pump front housing.
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 [a]
of the vane pump shaft with pulley.
(b) Using vernier calipers, measure the inner diameter
[b] of the vane pump front housing bushing.
(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.
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PS–14POWER STEERING – VANE PUMP
PS
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 leaks.
Close one of the holes and apply compressed air,
392 to 490 kPa (4 to 5 kgf/cm
2, 57 to 71 psi), into
the opposite side hole, and confirm that air does not
come out from the holes in the ends of the flow
control valve assembly.
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 severely
damaged, 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.
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POWER STEERING – VANE PUMPPS–15
PS
REASSEMBLY
NOTICE:
Before installation, coat the parts indicated by arrows
with power steering fluid (See page PS-7).
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.
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PS–16POWER STEERING – VANE PUMP
PS
(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:
The vane pump rotor can be installed in both
directions.
(b) Coat the 10 vane pump plates with power steering
fluid.
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POWER STEERING – VANE PUMPPS–17
PS
(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.
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PS–18POWER STEERING – VANE PUMP
PS
(c) Install the vane pump rear housing to the vane
pump front housing with the 4 bolts.
Torque: 22 N*m (224 kgf*cm, 16 ft.*lbf)
8. INSPECT TOTAL PRELOAD (See page PS-14)
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 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 front housing.
Torque: 21 N*m (214 kgf*cm, 16 ft.*lbf)
NOTICE:
Do not use a power steering fluid pressure
switch that has been subjected to an impact; for
example, a power steering fluid pressure switch
that has 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 front housing with the bolt.
Torque: 12 N*m (122 kgf*cm, 9 ft.*lbf)
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POWER STEERING – VANE PUMPPS–19
PS
INSTALLATION
1. INSTALL VANE PUMP ASSEMBLY
(a) Temporarily install the bolt to the vane pump
assembly.
(b) Install the vane pump assembly.
(c) Temporarily install the bolt (B).
(d) Using SST, 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.
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PS–20POWER STEERING – VANE PUMP
PS
(b) Temporarily connect the pressure feed tube
assembly to the vane pump assembly with the union
bolt.
(c) 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.
• Push the No. 1 fluid reservoir to pump hose
as far as it goes as shown in the illustration.
• Install the clip at the position specified in the
illustration.
5. INSTALL FAN AND GENERATOR V BELT (See page
EM-7)
6. ADD POWER STEERING FLUID
7. BLEED POWER STEERING SYSTEM (See page PS-6)
8. CHECK POWER STEERING FLUID LEVEL (See page
PS-2)
9. INSPECT FOR POWER STEERING FLUID LEAK
10. INSTALL FRONT FENDER APRON SEAL RH (See
page EM-62)
11. INSTALL FRONT WHEEL RH
Torque: 103 N*m (1,050 kgf*cm, 76 ft.*lbf)
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