differential LEXUS SC400 1991 Service Owner's Manual

(b) Remove SST.
(c) Insert the yoke into the transmission.
(d) Align the matchmarks and install the propeller shaft on thedifferential with the 3 bolts, washers and nuts.
NOTICE: Bolts should be inserted from the propeller
shaft side.
Torque: 79 N Vm (805 kgf Vcm, 58 ft Vlbf)
If using a new propeller shaft (w/ Phasemarks)
Install the propeller shaft phasemarks and differential phase-
marks so that their respective alignment phasemarks match.
If the propeller shaft phasemarks and differential phase-
marks do not align, install the propeller shaft and differential
alignment phasemarks are as close together as possible.
(w/o Phasemarks)
Install the propeller shaft.
(See page PR±28)
±
PROPELLER SHAFT PROPELLER SHAFTPR±29
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JOINT ANGLE INSPECTION AND
ADJUSTMENT
PR034±02
NOTICE: When performing operations which involve the
removal and installation of the propeller shaft, always
check the joint.
Make adjustments if necessary.
1. STABILIZE PROPELLER SHAFT AND DIFFERENTIAL
(a) Turn the propeller shaft several times by hand to stabilize the center support bearing and flexible couplings.
(b) Using a jack, raise and lower the differential to stabilize the differential mounting cushion.
2. CHECK JOINT ANGLE OF NO.2 JOINT AND NO.3 JOINT
(a) Using SST, measure the installation angle of the intermediate
shaft and propeller shaft.
SST 09370±50010
HINT: The SST should be directly underneath the tube.
(b) Using SST, measure the installation angle of the differential. SST 09370±50010
HINT: Measure the installation angle by placing the SST in
the position, as shown in the illustration.
(c) Calculate the No.2 joint angle.
PR±32
±
PROPELLER SHAFT PROPELLER SHAFT
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No.2 joint angle:A ± B = ± 1 01'+ 36 '
A: Intermediate shaft installation angle
B: Propeller shaft installation angle
(d) Calculate the No.3 joint angle.
No.3 joint angle:
B ± C = 54 '+ 36 '
B: Propeller shaft installation angle
C: Differential installation angle
If the measure angle is not within the specification, adjust it
with the center support bearing adjusting washer, differential
mount upper stopper and adjusting shim.
  Thickness
mm (in.)\
 \
Remarks
 






Center support
bearing
 






Adjusting
washer
 






2.0 (0.079)
4.0 (0.157)
6.0 (0.236)
8.5 (0.335)
\
 
\


\


\

\

Left and right washers should be the same thickness.
2 washers should not be assembled together.
Standard parts are used 6.0 mm (0.236 in.) washers.
  Set bolt 40.0 (1.575)\
 \

 


 


Mount upper
stopper 


2.3 (0.091)
2.8 (0.110)\
 
\

\

When the vehicle is new a 2.8 mm (0.110 in.)
stopper used in assembly.
 


Differential 

Adjusting shim
 


1.0 (0.039)
1.6 (0.063)
2.0 (0.079)\
 
\

\

Left and right washers should be the same thickness.
This shim is installed on top of the mount upper
stopper and is used for adjustment.
±
PROPELLER SHAFT PROPELLER SHAFTPR±33
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ADJUSTMENT CHART
PR035±02
HOW TO READ THIS CHART
Take measurements, then calculate the No.2 and No. 3 joint
angle.
Mark the calculated values on the chart and read the coordi-
nates.
Replace the adjusting washer, shim and mount upper stop-
per in accordance with the coordinates read and adjust the
joint angles.
Example
Measurements (Installation angle):Intermediate shaft 2  2 '
Propeller shaft 2  36 '
Differential 2  12 '
Joint angle: NO.2 2  20 ' ± 2  36 ' = ± 16 '
NO.3 2  36 ' ± 2  12 ' = 24 '
Adjustment:
Center support bearing Standard parts 6.0 mm (0.236 in.) ±2.5 mm (0.098 in) =
3.5 mm (0.138 in.)
Use adjusting washers which are 2.0 mm (0.079 in.)
thicker.
Differential
Use adjusting shims which are 1.0 mm (0.039 in.)
thicker.
HINT:
wMaintain the same thickness for the adjusting washers
and adjusting shims on both the left and right sides.
w If a washer, stopper and shim of the exact thickness are
not available, use the parts which are nearest in
thickness.
NOTICE: Check the joint angle once again after making
the adjustment.
PR±34
±
PROPELLER SHAFT PROPELLER SHAFT
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OPERATION
NEUTRAL (STRAIGHT±AHEAD) POSITION
SR0NU±01
Fluid from the pump is sent to the control valve. If the control valve is in \
the neutral position, all the fluid
will flow through the control valve into the relief port and back to the pu\
mp. At this time, hardly any pressure
is created and because the pressure on the cylinder piston is equal on bot\
h sides, the piston will not move
in either direction.
WHEN TURNING
When the steering main shaft is turned in either direction, the control valv\
e also moves, closing one of the
fluid passages. The other passage then opens wider, causing a change in fluid flow volume and, at the
same time, a differential pressure is created between both sides of the piston. Conseque\
ntly, the piston
moves in the direction of the lower pressure so that the fluid in the cylinder is forced back to the pump
through the control valve.
±
STEERING POWER STEERINGSR±103
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ASSEMBLY REMOVAL AND
INSTALLATION
COMPONENTS
SA09A±07
±
SUSPENSION AND AXLE REAR DIFFERENTIALSA±81
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DIFFERENTIAL REMOVAL
SA0S6±05
1. REMOVE PROPELLER SHAFT(See page PR±6 or 24)
2. DRAIN DIFFERENTIAL OIL
3. DISCONNECT REAR DRIVE SHAFTS
(a) Place matchmarks on the drive shafts and side gear shafts.
(b) Using a hexagon wrench, disconnect the drive shafts from
the differential.
(c) Hang up the drive shafts using wire, etc.
4. REMOVE DIFFERENTIAL
(a) Support the differential with a jack.
(b) Using a hexagon wrench, remove the 3 bolts.
(c) Remove the 2 bolts and lower stoppers.
(d) Remove the differential.
SA±82
±
SUSPENSION AND AXLE REAR DIFFERENTIAL
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(e) Remove the upper mount stopper from the differential carrier.
HINT:
w Same vehicles have the adjusting shim for adjusting the
propeller shaft joint angle installed on top of the upper
mount stopper.
w Adjusting shim is not always as it is used upon need.
DIFFERENTIAL INSTALLATION
SA0S7±06
1. INSTALL DIFFERENTIAL
(a) Install the upper mount stopper on the differential carrier.
HINT:
wUse the upper mount stopper which was removed.
w On vehicles with the adjusting shim installed on top of
the mount upper stopper, install that adjusting shim.
w Adjusting shim is not always as it is used upon need.
(b) Support the differential with a jack and install the lower stoppers and 2 new bolts.
Torque: 147 N Vm (1,500 kgf Vcm, 108 ft Vlbf)
(c) Using a hexagon wrench, install 2 new LH mounting bolts.
Torque: 142 N Vm (1,450 kgf Vcm, 105 ft Vlbf)
(d) Using a hexagon wrench, install a new RH mounting bolt.
Torque: 142 N Vm (1,450 kgf Vcm, 105 ft Vlbf)
±
SUSPENSION AND AXLE REAR DIFFERENTIALSA±83
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2. CONNECT REAR DRIVE SHAFTS
(a) Align the matchmarks on the side gear shaft and drive shafts.
(b) Apply a light coat of engine oil on the threads of the bolts.
(c) Temporarily install the 12 hexagon bolts and 4 washers.
(d) Using a hexagon wrench, torque the bolts.
Torque: 83 N Vm (850 kgf Vcm, 61 ft Vlbf)
3. INSTALL PROPELLER SHAFT
(See page PR±12 or 28)
4. FILL DIFFERENTIAL WITH OIL
Oil grade: API GL±5 Hypoid Gear Oil
Viscosity: Above±18
C (0
F) SAE 90
Below±18
C (0
F) SAE 80W±90 or 80W
Capacity:
1.35 liters (1.42 US qts, 1.19 lmp qts)
SA±84±
SUSPENSION AND AXLE REAR DIFFERENTIAL
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DIFFERENTIAL CARRIER
COMPONENTS
SA0V2±01
±
SUSPENSION AND AXLE REAR DIFFERENTIALSA±85
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