TOYOTA SIENNA 2007 Service Repair Manual

U151F AUTOMATIC TRANSAXLE – UNDERDRIVE PLANETARY GEARAX–259
AX
DISASSEMBLY
1. INSPECT UNDERDRIVE PLANETARY GEAR
PRELOAD
HINT:
(See page AX-260)
2. REMOVE FRONT PLANETARY GEAR NUT
(a) Using SST, loosen the staked part of the lock nut.
SST 09930-00010 (09931-00010, 09931-00020),
09387-00050
(b) Place the underdrive planetary gear in a soft jaw
vise.
NOTICE:
Be careful not to damage the differential drive
pinion.
(c) Using a socket wrench, remove the lock nut.
3. REMOVE CYLINDRICAL ROLLER BEARING RACE
INNER
(a) Using SST, remove the cylindrical roller bearing
race inner.
SST 09950-00020, 09950-00030, 09950-60010
(09951-00320, 09957-04010)
D003686E01
D003687E02
D025609E02
D003689E01

AX–260U151F AUTOMATIC TRANSAXLE – UNDERDRIVE PLANETARY GEAR
AX
4. REMOVE UNDERDRIVE PLANETARY GEAR
ASSEMBLY
(a) Using SST and a press, remove the differential drive
pinion, parking lock gear, counter driven gear with
underdrive planetary ring gear and radial ball
bearing front.
SST 09950-60010 (09951-00320), 09387-00050,
09950-00020, 09950-00030, 09950-40011
(09957-04010)
(b) Place the underdrive planetary gear in a soft jaw
vise.
(c) Using SST, remove the radial ball bearing rear from
the underdrive planetary gear.
SST 09950-60010 (09951-00320), 09950-00030,
09950-40011 (09957-04010)
5. REMOVE UNDERDRIVE PLANETARY RING GEAR
(a) Using a snap ring pliers, remove the snap ring.
(b) Remove the underdrive planetary ring gear from the
counter driven gear.
INSPECTION
1. INSPECT UNDERDRIVE PLANETARY GEAR
PRELOAD
(a) Using SST, fix the underdrive planetary gear
assembly.
SST 09387-00050
D026437E01
D003691E01
D003826E01
D003827E02
D025593E01

U151F AUTOMATIC TRANSAXLE – UNDERDRIVE PLANETARY GEARAX–261
AX
(b) Using SST and a torque wrench, measure the
turning torque of the underdrive planetary gear
assembly while rotating the torque wrench at 60
rpm.
SST 09387-00050
Turning torque at 60 rpm.:
0.50 to 1.42 N*m (5.1 to 14.5 kgf*cm, 4.4 to 12.6
in.*lbf)
HINT:
Use a torque wrench with a fulcrum length of 160
mm (6.3 in.).
REASSEMBLY
1. INSTALL UNDERDRIVE PLANETARY RING GEAR
(a) Install a new snap ring to the outer race of the radial
ball bearing rear.
HINT:
When replacing the bearing, also replace the
counter driven gear with a new one.
(b) Using a piston ring compressor, squeeze the snap
ring.
(c) Using SST and a press, press in the outer race of
the radial ball bearing rear.
SST 09950-60020 (09951-00890), 09950-70010
(09951-07100)
NOTICE:
Be sure not to damage the snap ring during
outer race installation.
(d) Install the underdrive planetary ring gear to the
counter driven gear.
D025594E01
D008112E01
D008113
D008114E01
D003827E02

AX–262U151F AUTOMATIC TRANSAXLE – UNDERDRIVE PLANETARY GEAR
AX
(e) Using a snap ring pliers, install the snap ring.
2. INSTALL UNDERDRIVE PLANETARY GEAR
ASSEMBLY
(a) Using SST and a press, press the radial ball bearing
rear in the underdrive planetary gear.
SST 09502-12010, 09950-60010 (09951-00260),
09950-70010 (09951-07100)
NOTICE:
Press the bearing until it becomes flat at the
bottom.
(b) Install the counter driven gear with planetary ring
gear to the underdrive planetary gear.
(c) Using SST and a press, press in the radial ball
bearing front.
SST 09502-12010, 09950-60010 (09951-00260),
09950-70010 (09951-07100)
NOTICE:
Press the counter driven gear while rotating it.
(d) Using SST and a press, press in the parking lock
gear.
SST 09502-12010, 09950-60010 (09951-00260),
09950-70010 (09951-07100)
NOTICE:
Press the counter driven gear while rotating it.
D008115E01
D026435E01
D008117
D026436E01
D026433E01

U151F AUTOMATIC TRANSAXLE – UNDERDRIVE PLANETARY GEARAX–263
AX
3. INSTALL DIFFERENTIAL DRIVE PINION
(a) Using SST and a press, press the differential drive
pinion.
SST 09726-40010, 09950-60010 (09951-00260),
09950-70010 (09951-07100)
NOTICE:
Press the counter driven gear while rotating it.
4. INSTALL CYLINDRICAL ROLLER BEARING RACE
INNER
(a) Using SST and a press, press the cylindrical roller
bearing race inner.
SST 09506-35010, 09950-60010 (09951-00260),
09950-70010 (09951-07100)
NOTICE:
Press the counter driven gear while rotating it.
5. INSTALL FRONT PLANETARY GEAR NUT
(a) Place the underdrive planetary gear in a soft jaw
vise.
NOTICE:
Be careful not to damage the differential drive
pinion.
(b) Using a socket wrench, install a new lock nut.
Torque: 280 N*m (2,885 kgf*cm, 207 ft.*lbf)
HINT:
Use a torque wrench with a fulcrum length of 750
mm (29.53 in.).
(c) Using a pin punch and hammer, stake the lock nut.
CAUTION:
Be sure that there are no cracks on the nut.
6. INSPECT UNDERDRIVE PLANETARY GEAR
PRELOAD
HINT:
(See page AX-260)
D026434E01
D026432E01
D025609E02
C056809

AX–264U151F AUTOMATIC TRANSAXLE – UNDERDRIVE CLUTCH
AX
TRANSMISSION
U151F AUTOMATIC TRANSAXLE
UNDERDRIVE CLUTCH
COMPONENTS
C114869E03

U151F AUTOMATIC TRANSAXLE – UNDERDRIVE CLUTCHAX–265
AX
DISASSEMBLY
1. INSPECT UNDERDRIVE PACK CLEARANCE
HINT:
(See page AX-266)
2. REMOVE UNDERDRIVE CLUTCH FLANGE NO.2
HOLE SNAP RING
(a) Using a screwdriver, remove the underdrive clutch
flange No.2 snap ring.
3. REMOVE UNDERDRIVE CLUTCH DISC NO.1
(a) Remove the flange, 4 discs and 4 plates from the
underdrive clutch drum.
4. REMOVE UNDERDRIVE CLUTCH RETURN SPRING
SUB-ASSEMBLY
(a) Place SST on the clutch balancer and compress the
spring with a press.
SST 09350-32014
(b) Using a snap ring expander, remove the snap ring.
NOTICE:
• Stop the press when the spring seat is
lowered to the place 1 to 2 mm (0.039 to 0.078
in.) from the snap ring groove.
• This prevents the spring seat from being
deformed.
• Do not expand the snap ring excessively.
(c) Remove the clutch balancer from the underdrive
clutch drum.
D003701E01
D026430E01
D003703E01
C056359E01

AX–266U151F AUTOMATIC TRANSAXLE – UNDERDRIVE CLUTCH
AX
(d) Remove the return spring from the underdrive clutch
drum.
5. REMOVE UNDERDRIVE CLUTCH PISTON SET
(a) Install the underdrive clutch to the transaxle case.
NOTICE:
Be careful not to damage the oil seal ring.
(b) Holding the underdrive clutch piston by hand, apply
compressed air (392 kPa, 4.0 kgf/cm
2, 57 psi) to the
transaxle case to remove the underdrive clutch
piston.
6. REMOVE UNDERDRIVE CLUTCH DRUM O-RING
(a) Using a screwdriver, remove the O-ring from the
underdrive clutch drum.
INSPECTION
1. INSPECT UNDERDRIVE PACK CLEARANCE
(a) Install the underdrive clutch to the transaxle case.
NOTICE:
Be careful not to damage the oil seal rings.
(b) Install a dial indicator as shown in the illustration.
(c) Measure the underdrive clutch pack clearance while
applying and releasing compressed air (392 kPa,
4.0 kgf/cm
2, 57 psi).
Pack clearance:
1.51 to 1.71 mm (0.0594 to 0.0673 in.)
If the pack clearance is not as specified, inspect the
discs, plates and flange.
HINT:
There are 5 flanges in different thickness.
Flange thickness: mm (in.)
C056360E02
D003705
D026465E02
D026429E01
Mark Thickness Mark Thickness
1 3.0 (0.118) 4 3.6 (0.122)
2 3.2 (0.126) 5 3.8 (0.130)
3 3.4 (0.134) - -

U151F AUTOMATIC TRANSAXLE – UNDERDRIVE CLUTCHAX–267
AX
2. INSPECT UNDERDRIVE CLUTCH DISC NO.1
(a) Check if the sliding surface of the disc, plate and
flange are worn or burnt. If necessary, replace them.
HINT:
• If the lining of the disc comes off or discolors, or if
a part of the groove is worn, replace all discs.
• Before installing new discs, immerse them in ATF
for at least 15 minutes.
3. INSPECT UNDERDRIVE CLUTCH DRUM SUB-
ASSEMBLY
(a) Using a dial indicator, measure the inside diameter
of the underdrive clutch drum bushing.
Standard drum bushing:
37.06 to 37.08 mm (1.4591 to 1.4598 in.)
Maximum drum bushing:
37.13 mm (1.4618 in.)
If the inside diameter is greater than the maximum,
replace the underdrive clutch drum.
4. INSPECT UNDERDRIVE CLUTCH RETURN SPRING
SUB-ASSEMBLY
(a) Using a vernier calipers, measure the free length of
the spring together with the spring seat.
Standard free length:
17.14 mm (0.6752 in.)
REASSEMBLY
1. INSTALL UNDERDRIVE CLUTCH DRUM O-RING
(a) Coat a new O-ring with ATF, and install it to the
underdrive clutch drum.
NOTICE:
Make sure that the O-ring is not twisted or
pinched.
2. INSTALL UNDERDRIVE CLUTCH PISTON SET
(a) Coat the underdrive clutch piston with ATF, and
install it to the underdrive clutch piston drum.
NOTICE:
• Be careful not to damage the O-ring.
• Be careful not to damage the lip of the piston.
D004077
D008129E01
D003824
D026465E01
D003860

AX–268U151F AUTOMATIC TRANSAXLE – UNDERDRIVE CLUTCH
AX
3. INSTALL UNDERDRIVE CLUTCH RETURN SPRING
SUB-ASSEMBLY
(a) Install the return spring to the underdrive clutch
drum.
NOTICE:
Installing the spring sub-assembly, check that
all of the springs are fit in the piston correctly.
(b) Coat the clutch balancer with ATF.
(c) Install the clutch balancer to the underdrive clutch
drum.
NOTICE:
Be careful not to damage the lip of the clutch
balancer.
(d) Place SST on the clutch balancer and compress the
piston return spring with a press.
SST 09350-32014 (09351-32070)
(e) Using a snap ring expander, install the snap ring to
the underdrive clutch drum.
(f) Be sure that the end gap of the snap ring is not
aligned with the spring retainer claw.
NOTICE:
• Stop the press when the spring seat is
lowered to the place 1 to 2 mm (0.039 to 0.078
in.) from the snap ring groove.
• This prevents the spring seat from being
deformed.
• Do not expand the snap ring excessively.
(g) Set the end gap of the snap ring in the underdrive
clutch drum as shown in the illustration.
NOTICE:
The end gap of the snap ring should not align
with any of the stoppers.
C056360E02
C056359E01
D003703E01
D025592E01