power steering fluid TOYOTA SIENNA 2007 Service Owner's Manual

POWER STEERING – RACK AND PINION POWER STEERING GEARPS–31
PS
20. REMOVE RACK STEERING PISTON RING
(a) Using a screwdriver, remove the rack steering
piston ring and O-ring.
NOTICE:
Be careful not to damage the grooves for rack
steering piston ring.
INSPECTION
1. INSPECT POWER STEERING RACK
(a) Using a dial indicator, check the power steering rack
for runout and for teeth wear and damage.
Maximum runout:
0.3 mm (0.012 in.)
If necessary, replace the rack & pinion power
steering gear assembly.
(b) Check the back surface for wear and damage.
If necessary, replace the rack & pinion power
steering gear assembly.
2. INSPECT TIE ROD ASSEMBLY LH
(a) Secure the tie rod assembly in a vise.
(b) Install the nut to the stud bolt.
(c) Flip the ball joint stud back and forth 5 times.
(d) Using a torque wrench, turn the nut continuously at
a rate of 3 to 5 seconds per turn and take the torque
reading on the 5th turn.
Torque: Turning torque
0.83 to 3.43 N*m (8.5 to 35.0 kgf*cm, 7.3
to 30.4 in.*lbf)
3. INSPECT TIE ROD ASSEMBLY RH
HINT:
Perform the same procedure on the other side.
REASSEMBLY
1. INSTALL RACK STEERING PISTON RING
(a) Coat a new O-ring with power steering fluid and
install it onto the power steering rack.
(b) Expand a new rack steering piston ring with your
fingers.
NOTICE:
Be careful not to over expand the rack steering
piston ring.
(c) Coat a new rack steering piston ring with power
steering fluid.
R010955
ZX09355
ZK08184
C003629

PS–32POWER STEERING – RACK AND PINION POWER STEERING GEAR
PS
(d) Install the rack steering piston ring onto the power
steering rack, and settle it down with your fingers.
2. INSTALL POWER STEERING CYLINDER TUBE OIL
SEAL
(a) Coat a new cylinder tube oil seal lip with power
steering fluid.
(b) Using SST and a press, install the cylinder tube oil
seal.
SST 09950-60010 (09951-00420, 09951-00250,
09952-06010), 09950-70010 (09951-07360)
NOTICE:
• Make sure that the cylinder tube oil seal is
installed facing in the correct direction.
• Take care so that the cylinder tube oil seal
will not be reversed as you install it.
3. INSTALL POWER STEERING RACK
(a) Install SST onto the power steering rack.
SST 09631-33010
HINT:
If necessary, scrape the burrs off the power steering
rack teeth end and burnish.
(b) Coat the SST with power steering fluid.
(c) Install the power steering rack into the rack housing.
(d) Remove the SST.
N000401
F040545E06
W002101E12

POWER STEERING – RACK AND PINION POWER STEERING GEARPS–33
PS
4. INSTALL POWER STEERING RACK BUSH
(a) Using SST and a press, install the rack bush oil seal
onto the rack bush.
SST 09950-60010 (09951-00400), 09950-70010
(09951-07100)
NOTICE:
Make sure that the rack bush oil seal is installed
facing in the correct direction.
(b) Coat a new O-ring with power steering fluid and
install it onto the rack bush.
(c) To prevent rack bush oil seal lip damage, wind vinyl
tape around the rack end, and apply power steering
fluid.
(d) Install the rack bush onto the power steering rack.
5. INSTALL CYLINDER END STOPPER
(a) Align the installation hole for the wire of the cylinder
end stopper with the slot of the rack housing.
(b) Install a new wire into the cylinder end stopper.
(c) Using a screwdriver, turn the cylinder end stopper
counterclockwise by 450 +- 50
.
6. AIR TIGHTNESS TEST
(a) Install SST onto the rack housing.
SST 09631-12071 (09633-00010)
(b) Apply vacuum of 53 kPa (400 mmHg, 15.75 in.Hg)
for about 30 seconds.
(c) Check that there is no change in the vacuum.
If there is a change in the vacuum, check the
installation of the oil seals.
7. INSTALL POWER STEERING CONTROL VALVE
UPPER OIL SEAL
(a) Coat a control valve upper bearing and a new
control valve upper oil seal with power steering fluid.
(b) Using SST and a press, install the control valve
upper oil seal.
SST 09950-70010 (09951-07150), 09950-60010
(09951-00180, 09952-06010, 09951-00320)
F040543E06
F005730E07
F040546E07
F045546E01
F040912E08

PS–34POWER STEERING – RACK AND PINION POWER STEERING GEAR
PS
(c) Using SST and a press, install the control valve
upper bearing.
SST 09950-70010 (09951-07150), 09950-60010
(09951-00180, 09952-06010, 09951-00340)
8. INSTALL POWER STEERING CONTROL VALVE
(a) Expand 4 new control valve rings with your fingers.
NOTICE:
Be careful not to over expand the control valve
rings.
(b) Coat the 4 control valve rings with power steering
fluid.
(c) Install the 4 control valve rings onto the control
valve, and settle them down with your fingers.
(d) Carefully slide the tapered end of SST over the
control valve rings until they fit to the control valve.
SST 09631-20081
NOTICE:
Be careful not to damage the control valve rings.
(e) To prevent control valve upper oil seal lip damage,
wind vinyl tape around the serrated part of the
control valve.
(f) Coat the control valve upper oil seal lip with power
steering fluid.
(g) Install the control valve onto the control valve
housing.
NOTICE:
Be careful not to damage the control valve ring
and control valve upper oil seal lip.
(h) Coat a new oil seal lip with power steering fluid.
(i) Using SST and a press, install the oil seal.
SST 09612-22011
NOTICE:
Make sure that the oil seal is installed facing in
the correct direction.
(j) Apply grease to the needle roller bearing.
(k) Install a new gasket onto the control valve housing.
(l) Wind vinyl tape around the serrated part of the
control valve.
F040913E09
C003629
R011573E06
F041508E01
F041509E01

POWER STEERING – RACK AND PINION POWER STEERING GEARPS–39
PS
HINT:
Perform the same procedure on the other side.
17. INSTALL STEERING RACK BOOT CLIP
(a) Using pliers, install the 2 rack boot clips.
18. INSTALL TIE ROD ASSEMBLY LH
(a) Screw the lock nut and tie rod assembly onto the
rack end sub-assembly until the matchmarks are
aligned.
HINT:
After adjusting toe-in, torque the lock nut.
19. INSTALL TIE ROD ASSEMBLY RH
HINT:
Perform the same procedure on the other side.
20. INSTALL STEERING LEFT TURN PRESSURE TUBE
(a) Coat 2 new O-rings with power steering fluid and
install them onto the left turn pressure tube.
(b) Using SST, install the left turn pressure tube onto
the power steering gear assembly.
SST 09023-38201
Torque: 11.5 N*m (117 kgf*cm, 8 ft.*lbf)
HINT:
• Use a torque wrench with a fulcrum length of 345
mm (13.58 in.).
• This torque value is effective when SST is
parallel to the torque wrench.
21. INSTALL STEERING RIGHT TURN PRESSURE TUBE
SST 09023-38201
HINT:
Perform the same procedure on the other side.
22. INSTALL RETURN TUBE NO.2
(a) Using SST, install the return tube No. 2.
SST 09023-12701
Torque: 22.5 N*m (229 kgf*cm, 17 ft.*lbf)
HINT:
Use a torque wrench with a fulcrum length of 345
mm (13.58 in.).
INSTALLATION
1. INSTALL RACK & PINION POWER STEERING GEAR
ASSEMBLY
(a) Install the power steering gear assembly with the 2
bolts and nuts.
Torque: 70 N*m (714 kgf*cm, 52 ft.*lbf)
D029981E02
D030601E01
D029979

POWER STEERING – RACK AND PINION POWER STEERING GEARPS–41
PS
3. INSTALL FRONT STABILIZER BRACKET NO.1 LH
(a) Install the stabilizer bracket No. 1 with the 2 bolts.
Torque: 17 N*m (173 kgf*cm, 12 ft.*lbf)
4. INSTALL FRONT STABILIZER BRACKET NO.1 RH
HINT:
Perform the same procedure on the other side.
5. INSTALL FRONT STABILIZER LINK ASSEMBLY LH
6. INSTALL FRONT STABILIZER LINK ASSEMBLY RH
HINT:
Perform the same procedure on the other side.
7. INSTALL STEERING INTERMEDIATE SHAFT
ASSEMBLY
(a) Align matchmarks on the intermediate shaft
assembly and power steering gear assembly.
(b) Install the bolt.
Torque: 36 N*m (367 kgf*cm, 27 ft.*lbf)
(c) Install the dust cover.
HINT:
Ensure that the springs are installed tightly.
8. INSTALL TIE ROD ASSEMBLY LH
9. INSTALL TIE ROD ASSEMBLY RH
HINT:
Perform the same procedure on the other side.
10. INSTALL FRONT WHEEL
Torque: 103 N*m (1,050 kgf*cm, 76 ft.*lbf)
11. INSPECT CENTER FRONT WHEEL
12. INSPECT STEERING WHEEL CENTER POINT
13. ADD POWER STEERING FLUID
14. BLEED POWER STEERING FLUID
HINT:
(See page PS-6)
15. INSPECT FOR POWER STEERING FLUID LEAK
D030615E04
D029986E04
D030704E04

PS–2POWER STEERING – POWER STEERING SYSTEM
PS
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of the
problem. Likely causes of the problem are indicated in
descending order. Check each suspected area in order.
Repair or replace the faulty parts or perform adjustments as
necessary.
POWER STEERING SYSTEM
ON-VEHICLE INSPECTION
1. INSPECT DRIVE BELT
(a) Visually check the drive belt for excessive wear,
frayed cords, etc.
If any defect is found, replace the drive belt.
HINT:
Cracks on the rib side of a belt are considered
acceptable. Replace the belt if there are any
missing ribs.
2. CHECK POWER STEERING FLUID LEVEL
(a) Keep the vehicle level.
Symptom Suspected Area See page
Hard steeringTires (Improperly inflated)TW-2
Power steering fluid level (Low)PS-2
Drive belt (Loose) -
Front wheel alignment (Incorrect)SP-4
Steering system joints (Worn) -
Suspension arm ball joints (Worn)SP-24
Steering column (Binding)SR-6
Power steering vane pumpPS-9
Power steering gearPS-24
Poor returnTires (Improperly inflated)TW-2
Front wheel alignment (Incorrect)SP-4
Steering column (Binding)SR-6
Power steering gearPS-24
Excessive playSteering system joints (Worn) -
Suspension arm ball joints (Worn)SP-24
Intermediate shaft, Sliding yoke (Worn) -
Front wheel bearing (Worn)AH-5
Power steering gearPS-24
Abnormal noisePower steering fluid level (Low)PS-2
Steering system joints (Worn) -
Power steering vane pumpPS-9
Power steering gearPS-24
F040449E03

POWER STEERING – POWER STEERING SYSTEMPS–3
PS
(b) With the engine stopped, check the fluid level in the
fluid reservoir.
If necessary, add fluid.
Fluid:
ATF DEXRON II or III, or equivalent
HINT:
If the fluid is hot, check that the fluid level is within
the HOT range on the fluid reservoir. If the fluid is
cold, check that the fluid level is within the COLD
range.
(c) Start the engine and run it at idle.
(d) Turn the steering wheel from lock to lock several
times to raise fluid temperature.
Fluid temperature:
75 to 80
C (167 to 176F)
(e) Check for foaming or emulsification.
If foaming or emulsification is identified, bleed the
power steering system (See page PS-6).
(f) With the engine idling, measure the fluid level in the
fluid reservoir.
(g) Stop the engine.
(h) Wait a few minutes and remeasure the fluid level in
the fluid reservoir.
Maximum fluid level rise:
5 mm (0.20 in.)
If a problem is found, bleed the power steering
system (See page PS-6).
(i) Check the fluid level.
3. INSPECT STEERING FLUID PRESSURE
(a) Disconnect the pressure feed tube assembly from
the vane pump assembly (See page PS-9).
C133502E01
C137876E01
C137875E01

PS–4POWER STEERING – POWER STEERING SYSTEM
PS
(b) Connect SST as shown in the illustration.
SST 09640-10010 (09641-01010, 09641-01060,
09641-01030)
NOTICE:
Check that the valve of SST is in the open
position.
(c) Bleed the power steering system (See page PS-6).
(d) Start the engine and run it at idle.
(e) Turn the steering wheel from lock to lock several
times to raise fluid temperature.
Fluid temperature:
75 to 80
C (167 to 176F)
(f) With the engine idling, close the valve of SST and
observe the reading on SST.
Standard fluid pressure:
7,800 to 8,300 kPa (79.5 to 84.6 kgf/cm
2, 1,131
to 1,204 psi)
NOTICE:
• Do not keep the valve closed for more than 10
seconds.
• Do not allow the fluid temperature to become
too high.
C133506E01
C162083E01

POWER STEERING – POWER STEERING SYSTEMPS–5
PS
(g) With the engine idling, open the valve fully.
(h) Measure the fluid pressure at engine speeds of
1,000 rpm and 3,000 rpm.
Fluid pressure difference:
490 kPa (5 kgf/cm
2, 71 psi) or less
NOTICE:
Do not turn the steering wheel.
(i) With the engine idling and the valve fully opened,
turn the steering wheel left or right to the full lock
position. Observe the reading on SST.
Standard fluid pressure:
7,800 to 8,300 kPa (79.5 to 84.6 kgf/cm
2, 1,131
to 1,204 psi)
NOTICE:
• Do not keep the steering wheel in the full lock
position for more than 10 seconds.
• Do not allow the fluid temperature to become
too high.
(j) Disconnect SST.
(k) Connect the pressure feed tube assembly to the
vane pump assembly (See page PS-19).
(l) Bleed the power steering system (See page PS-6).
4. CHECK STEERING EFFORT
(a) Stop the vehicle on a level, paved surface and turn
the wheels straight ahead.
(b) Disconnect the negative (-) battery cable from the
battery.
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner
activation.
(c) Remove the steering pad (See page RS-423).
(d) Connect the negative (-) battery cable to the battery.
(e) Using a torque wrench, check if the steering wheel
set nut is properly tightened.
Torque: 50 N*m (510 kgf*cm, 37 ft.*lbf)
(f) Start the engine and run it at idle.
C162084E01
C162085E01