1991 LEXUS SC400 Service Repair Manual

Page 2977 of 4087

LEXUS SC400 1991  Service Repair Manual 
9.  CHECK PRESSURE READING WITH STEERING WHEELTURNED TO FULL LOCK
Be sure the pressure gauge valve is fully opened and the en-
gine idling.
Minimum  pressure:
7,355 kPa (75 kgf/cm
2, 1,067 psi)
NOTIC

Page 2978 of 4087

LEXUS SC400 1991  Service Repair Manual 
POWER STEERING PUMP
(SC400)
POWER STEERING PUMP REMOVAL
AND INSTALLATION
SR0G4±01
Remove and install the parts, as shown.
MAIN POINTS OF REMOVAL AND
INSTALLATION
1.  REMOVE DRIVE BELTLoosen   the dr

Page 2979 of 4087

LEXUS SC400 1991  Service Repair Manual 
2.  INSTALL PUMP ASSEMBLYTorque the bolts and nut on the pump assembly in the order
shown.
Torque:
Bolt 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
Nut 43 N Vm (440 kgf Vcm, 32 ft Vlbf)
3.  CONNECT PRESSURE TU

Page 2980 of 4087

LEXUS SC400 1991  Service Repair Manual 
COMPONENTS
SR0G5±03
SECTIONAL VIEW
SR0G6±01
SR±120±
STEERING POWER STEERING 
WhereEverybodyKnowsYourName

Page 2981 of 4087

LEXUS SC400 1991  Service Repair Manual 
POWER STEERING PUMP
DISASSEMBLY
SR0G7±02
1.  MOUNT POWER STEERING PUMP IN VISE
NOTICE: Do not tighten the vise too tight.
2.  REMOVE PUMP PULLEY
(a)  Using SST, remove the pulley set nut.SST 09278±

Page 2982 of 4087

LEXUS SC400 1991  Service Repair Manual 
6.  REMOVE VANE PUMP SHAFT WITH BEARING
(a)  Using snap ring pliers, remove the snap ring.
(b)  Temporarily install the appropriate plate washer and pulleynut to the pump shaft.
(c)  Using SST, pull

Page 2983 of 4087

LEXUS SC400 1991  Service Repair Manual 
(b)  Remove the side rear plate.
(c)  Remove the O±ring from side rear plate.
(d)  Remove the cam ring, rotor and the 10 vane plates.
(e)  Remove the straight pin from the side front plate.
(f)  Rem

Page 2984 of 4087

LEXUS SC400 1991  Service Repair Manual 
Maximum clearance:0.07 mm (0.0028 in.)
If more than maximum, replace the entire power steering
pump.
2.  INSPECT ROTOR AND VANE PLATES
(a)  Using a micrometer, measure the height, thickness and lengt