1991 LEXUS SC400 power steering fluid

(b) Check the flow control valve for leakage.Close one of the holes and apply compressed air 392 ±490
kPa (4±5 kgf/ cm
2, 57±71 psi) into the opposite side, and con-
firm that air does not come out from the end holes.
If necessary, replace the valve with one having the same let-
ter as inscribed on the front housing.
Inscribed mark:
A, B, C, D, E or F
4. INSPECT FLOW CONTROL SPRINGUsing a calipers, measure the free length of the spring.
Minimum spring length:
36 mm (1.42 in.)
If not within specification, replace the spring.
5. IF NECESSARY, REPLACE OIL SEAL
(a) Using SST, tap out the oil seal. SST 09631±10030
(b) Using a 22 mm socket wrench and hammer, drive in a new oil seal.
NOTICE: Make sure you install the oil seal facing the correct
direction.
(c) Coat the oil seal lip with power steering fluid.
±
STEERING POWER STEERINGSR±125
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6. IF NECESSARY, REPLACE BEARING
(a) Using snap ring pliers, remove the snap ring.
(b) Using a press, press out the bearing.
(c) Using a press, press in a new bearing.
(d) Using snap ring pliers, install a new snap ring.
POWER STEERING PUMP ASSEMBLY
SR0G9±02
1. COAT WITH POWER STEERING FLUID BEFOREASSEMBLY
(See page SR±120)
2. INSTALL VANE PUMP SHAFT WITH BEARING
(a) Using SST and a press, press in the pump shaft. SST 09238±47012
(b) Using snap ring pliers, install a new snap ring.
3. INSTALL SIDE FRONT PLATE, CAM RING, ROTOR, VANE PLATES AND SIDE REAR PLATE
(a) Install the longer straight pin to the front housing.
SR±126
±
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(b) Coat new 2 O±rings with power steering fluid and install themto the side front plate.
(c) Coat a new O±rings with power steering fluid and install it to the side rear plate.
(d) Using SST and a press, press in the side front plate. SST 09238±47012
HINT: Match the wide hole on the side front plate with the
longer straight pin.
NOTICE: Be careful not to damage the O±rings.
(e) Install the shorter straight pin to the side front plate.
(f) Match the wide hole of the cam ring with the longer straightpin, and install the cam ring.
HINT: Install the cam ring with the inscribed mark facing the
rear.
(g) Install the rotor to the shaft with the inscribed mark facing the rear.
±
STEERING POWER STEERINGSR±127
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(h) Coat the 10 vane plates with power steering fluid.
(i) Install the 10 vane plates with the round end facing outward.
(j) Match the wide hole with the longer straight pin and press inthe side rear plate with a press.
NOTICE: Be careful not to damage the O±ring.
4. INSTALL WAVE WASHERInstall the wave washer so that its protrusions fit into the slots
in the side rear plate.
5. INSTALL REAR BRACKET
(a) Coat a new O±ring with power steering fluid and install it to the rear bracket.
(b) Install the rear bracket and tighten the 4 bolts.
Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
SR±128±
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6. MEASURE PUMP SHAFT PRELOAD
(a) Check that the shaft rotates smoothly without abnormalnoise.
(b) Temporarily install the pulley nut and check the rotating
torque.
Rotating torque:
0.1 N Vm (1.0 kgf Vcm, 0.9 in. Vlbf) or less
7. INSTALL FLOW CONTROL VALVE, SPRING, SPRING
SEAT AND PRESSURE PORT UNION
(a) Coat new O±rings with power steering fluid and install them
to the spring seat and pressure port union.
HINT: Install a thick O±ring to the spring seat and a thin O±
ring to the pressure port union.
(b) Install the spring seat with the bolt hole facing out±ward.
(c) Using snap ring pliers, install a new snap ring.
(d) Install spring and valve to the front housing.
(e) Install and torque the pressure port union.
Torque: 69 N Vm (700 kgf Vcm, 51 ft Vlbf)
±
STEERING POWER STEERINGSR±129
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8. INSTALL SUCTION PORT UNION
(a) Coat a new O±ring with power steering fluid and install it tothe suction port union.
(b) Install the suction port union with the 2 bolts.
Torque: 13 N Vm (130 kgf Vcm, 9 ft Vlbf)
9. INSTALL PUMP PULLEY
(a) Install the pulley and nut to the shaft.
(b) Using SST, torque the set nut.
SST 09278±54012
Torque: 43 N Vm (440 kgf Vcm, 32 ft Vlbf)
SR±130±
STEERING POWER STEERING
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(b) Using SST, remove the oil seal.SST 09612±30012
NOTICE: Be careful not to damage the rack housing.
HINT: When using the SST, apply the tips of the SST to the
cutouts in the housing.
(c) Coat a new oil seal lip with power steering fluid.
(d) Using SST, install the new oil seal. SST 09620±30010 (09624±30010, 09631±00020)
NOTICE: Ensuse that the oil seal facing the correct direction.
(e) Using SST, press in a new bearing.
SST 09620±30010 (09626±30010, 09631±00020)
3. IF NECESSARY, REPLACE CONTROL VALVE HOUSING OIL SEAL AND BEARING
(a) Using SST, press out the oil seal with the bearing.
SST 09630±24013 (09620±24010), 09631±12020
(b) Coat the lip of a new oil seal with power steering fluid.
(c) Using SST, press in the new oil seal. SST 09630±24013 (09620±24020),
09631±12020
NOTICE: Ensure that the oil seal facing the correct direction.
SR±154±
STEERING POWER STEERING
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(d) Using SST, press in a new bearing.SST 09630±24013 (09620±24030), 09631±12020
4. IF NECESSARY, REPLACE STEERING RACK TEFLON RING AND O±RING
(a) Using a screwdriver, remove the teflon ring and O±ring.
NOTICE: Be careful not to damage the groove for the teflon
ring.
(b) Coat a new O±ring with power steering fluid, and install it.
(c) Expand a new teflon ring with your fingers.
NOTICE: Be careful not to over±expand the teflon ring.
(d) Install the teflon ring to the rack.
(e) Coat the teflon ring with power steering fluid and snug it down
with your fingers.
5. IF NECESSARY, REPLACE CONTROL VALVE TEFLON RINGS
(a) Using a screwdriver, remove the 4 teflon rings.
NOTICE: Be careful not to damage the grooves for the teflon
ring.
±
STEERING POWER STEERINGSR±155
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