1991 LEXUS SC400 power steering fluid

(b) Expand 4 new teflon rings with your fingers.
NOTICE: Be careful not to over±expand the teflon ring.
(c) Install the 4 teflon rings to the control valve.
(d) Coat the 4 teflon rings with power steering fluid and snugthem down with your fingers.
(e) Carefully slide the tapered end of the SST over the teflon rings to seat the rings.
SST 09631±20081
NOTICE: Be careful not to damage the teflon rings.
6. IF NECESSARY, REPLACE HY DRAULIC REACTION
CHAMBER TEFLON RINGS AND O±RINGS
(a) Using a screwdriver, remove the 2 teflon rings and 2 O ±rings.
NOTICE: Be careful not to damage the grooves for the teflon
ring.
(b) Coat 2 new O±rings with power steering fluid, and install
them.
(c) Expand 2 new teflon rings with your fingers.
NOTICE: Be careful not to over±expand the teflon rings.
(d) Install the 2 teflon rings to the control valve.
(e) Coat the teflon rings with power steering fluid, and snug them
down with your fingers.
(f) Carefully slide the tapered end of the SST over the teflon rings to seat the rings.
SST 09631±32020
NOTICE: Be careful not to damage the teflon rings.
SR±156±
STEERING POWER STEERING
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7. IF NECESSARY, REPLACE PRESSURE CONTROLVA LV E
(a) Using a hexagon wrench, remove the 3 bolts.
(b) Remove the 3 O±rings from the housing.
(c) Coat 3 new O±rings with power steering fluid, and install them on the control valve housing.
(d) Using a hexagon wrench, install a new pressure control valve
with the 3 bolts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
STEERING GEAR HOUSING ASSEMBLY
SR0P0±01
1. COAT WITH POWER STEERING FLUID OR
MOLYBDENUM DISULPHIDE LITHIUM BASE GREASE
(See page SR±148)
2. INSTALL RACK HOUSING OIL SEAL AND SPACER
(a) Coat a new oil seal lip with power steering fluid.
(b) Insert SST into the oil seal and spacer. SST 09631±12020, 09631±32010
NOTICE:
w Make sure you install the oil seal facing the correct
direction.
w Take care that the oil seal does not get reversed as you
install it.
(c) Softly tap in the spacer and oil seal.
±
STEERING POWER STEERINGSR±157
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3. INSTALL STEERING RACK
(a) Install SST to the steering rack.HINT: If necessary, scrape the burrs off the steering rack
teeth end and burnish.
SST 09631±20102
(b) Coat SST with power steering fluid.
(c) Insert the rack into the cylinder.
(d) Remove SST.
4. INSTALL CYLINDER END STOPPER, OIL SEAL AND SPACERS
(a) To prevent oil seal lip damage, wind vinyl tape on the steering
rack end, and apply power steering fluid.
(b) Install the oil seal by pushing it into the cylinder, wit hout tilting.
NOTICE:
wMake sure you install the oil seal facing the correct
direction.
w Take care that the oil seal does not get reversed as you
install it.
(c) Install the 2 spacers.
(d) Using SST, drive in the cylinder end stopper.
SST 09620±30010 (09627±30010, 09631±00020)
SR±158
±
STEERING POWER STEERING
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(e) Using snap ring pliers, install a new snap ring.
5. AIR TIGHTNESS TEST
(a) Install SST to the unions of the rack housing.SST 09631±12071
(b) Apply 53.3 kPa (400 mmHg, 15.75 inVHg) of vacuum for about 30 seconds.
(c) Check that there is no change in the vacuum. If there is change in the vacuum, check the installation of the
rack housing oil seals.
6. INSTALL CONTROL VALVE
(a) Coat the teflon rings with power steering fluid.
(b) Push the control valve into the rack housing.
7. INSTALL CONTROL VALVE HOUSING
(a) Coat a new O±ring with power steering fluid, and install it to the valve housing.
(b) Using a hexagon wrench, tighten the 2 bolts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
NOTICE: To prevent oil seal lip damage, wind vinyl tape on the
serration part of the control valve shaft.
8. INSTALL LOWER BEARING AND SPACER
±
STEERING POWER STEERINGSR±159
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TROUBLESHOOTING FLOW±CHART
SR0GT±04
Trouble

Hard steering at idle or low±speed driving.

Steering too sensitive during high±speed driving.
Preliminary Check

Check tire pressure.

Check lubrication of suspension and steering linkage.

Check front wheel alignment.

Check steering system joint and suspension arm ball joint.

Check for bent steering column.

Check that all connectors are secure.

Check PS pump fluid pressure. (See page SR±115)
SR±164±
STEERING POWER STEERING
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