Page 2329 of 2389
ON±VEHICLE INSPECTION
1. CHECK THAT STEERING WHEEL FREEPLAY IS
CORRECT
With the vehicle stopped and tires pointed straight ahead,
rock the steering wheel gently back and forth with light fin-
ger pressure.
Freeplay should not exceed the maximum limit.
Maximum freeplay: 30 mm (1.18 in.)
If incorrect, repair.
2. CHECK STEERING LINKAGE AND GEAR HOUSING
(a) Check the steering linkage for looseness or dam-
age.
Check that:
wTie rod ends do not have excessive play.
wBoots are not damaged.
wBoot clamps are not loose.
(b) Check gear housing for grease leakage or oozing.
± STEERINGOn±Vehicle InspectionSR±3
Page 2330 of 2389
(MAIN POINTS OF REMOVAL AND
INSTALLATION)
1. REMOVE UNIVERSAL JOINT
(a) Remove the two set bolts.
(b) Place matchmarks on the universal joint and control
valve shaft.
(e) First pull the universal joint from the gear housing,
and then pull it out from the main shaft.
STEERING COLUMN
REMOVAL AND INSTALLATION OF
STEERING COLUMN
Remove and install the parts as shown.
2. REMOVE STEERING WHEEL
Using SST, remove the steering wheel.
SST 09609±20011
3. CHECK STEERING WHEEL CENTER POINT AFTER
INSTALLING STEERING COLUMN
± STEERINGSteering ColumnSR±4
Page 2331 of 2389
DISASSEMBLY OF STEERING
COLUMN
1. REMOVE UPPER BRACKET
(a) Using a centering punch, mark the center of the
tapered±head bolt.
(b) Using a 3 ± 4 mm (0.12 ±0.16 in.) drill, drill into the
tapered±head bolt.
Non±Tilt Steering Column
COMPONENTS
± STEERINGSteering Column (Non±Tilt Steering Column)SR±5
Page 2332 of 2389
3. REMOVE THRUST STOPPER
(a) Using a screwdriver, remove the snap ring and thrust
stopper.
(b) Remove the 0±ring from the thrust stopper. (b) Using snap ring pliers, remove the snap ring.
(c) Remove the main shaft.
(d) Using snap ring pliers, remove the snap ring from the
main shaft. (c) Using a screw extractor, remove the tapered±head
bolt.
(d) Remove the two bolts, and separate the upper brack-
et and the column tube.
2. REMOVE MAIN SHAFT
(a) Remove the two thrust stopper set bolts. ,
± STEERINGSteering Column (Non±Tilt Steering Column).SR±6
Page 2333 of 2389
3. INSPECT LOWER BEARING
Check the lower bearing rotation condition and check for
abnormal noise.
If bearing is worn or damaged, replace the thrust stopper.
4. (A /T)
INSPECT KEY INTERLOCK SOLENOID
(See page AT±411)
5. (A/T)
IF NECESSARY, REPLACE KEY INTERLOCK
SOLENOID
(See page SR±1 3)
INSPECTION AND REPLACEMENT OF
STEERING COLUMN
1. INSPECT UPPER BRACKET
Check that the steering lock mechanism operates proper-
ly.
2. INSPECT UPPER BEARING
Check the upper bearing rotation condition and check for
abnormal noise.
If the bearing is worn or damaged, replace the column
tube.
± STEERINGSteering Column (Non±Tilt Steering Column)SR±7
Page 2334 of 2389
2. INSTALL MAIN SHAFT TO COLUMN TUBE
(a) Using snap ring pliers, install the snap ring in the low-
er groove of the main shaft.
(b) Apply molybdenum disulphide lithium base grease
to the thrust stopper.
(c) Insert the main shaft into the column tube.
3. INSTALL UPPER BRACKET TO COLUMN TUBE
(a) Install the upper bracket with the two tapered±head
bolts.
(b) Tighten the tapered±head bolts until the bolt heads
break off.
ASSEMBLY OF STEERING COLUMN
(See page SR±5)
1. INSTALL THRUST STOPPER
(a) Install a new O±ring to the thrust stopper.
(b) Install the thrust stopper and snap ring.
(e) Install the two thrust stopper set bolts.
Torque: 130 kg±cm (9 ft±11b, 13 N±m)(d) Using snap ring pliers, install the snap ring.
± STEERINGSteering Column (Non±Tilt Steering Column)SR±8
Page 2335 of 2389

POWER STEERING
Description
PRINCIPLES OF POWER STEERING
Power steering is one type of hydraulic device for utilizing engine power to reduce steering effort.
Consequently, the engine is used to drive a pump to develop fluid pressure, and this pressure acts on a
piston within the power cylinder so that the piston assists the rack effort. The amount of this assistance
depends on the extent of pressure acting on the piston. Therefore, if more steering force is required, the
pressure must be raised. The variation in the fluid pressure is accomplished by a control valve which is
linked to the steering main shaft.
WHEN TURNING
When the steering main shaft is turned in either di-
rection, the control valve 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, pressure is created. Consequently, a
pressure difference occurs between both sides of the
piston and 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.
NEUTRAL (STRAIGHT±AHEAD) POSITION
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
pump. At this time, hardly any pressure is created and because
the
pressure on the cylinder piston is equal on both sides, the piston
will not move in either direction.
± STEERINGPower Steering (Description)SR±18
Page 2336 of 2389

SERVICE HINT
Troubles with the power steering system are usually
concerned with hard steering due to the fact that
there is no assist. In such cases, before attempting
to make repairs, it is necessary to determine wheth-
er the trouble lies with the pump or with the gear
housing. To do this, an on±vehicle inspection can be
made by using a pressure gauge.
ON±VEHICLE INSPECTION
Power steering is a hydraulic device and problems
are normally due to insufficient fluid pressure acting
on the piston. This could be caused by either the
pump not producing the specified fluid pressure or
the control valve in the gear housing not functioning
properly so that the proper fluid pressure can not be
obtained.
If the fault lies with the pump, the same symptoms
will generally occur whether the steering wheel is
turned fully to the right or left. On the other hand, if
the fault lies with the control valve, there will gener-
ally be difference between the amount of assist
when the steering wheel is turned to the left and
right, causing harder steering. However, if the piston
seal of the power cylinder is worn, there will be a
loss of fluid pressure whether the steering wheel is
turned to the right or left and the symptoms will be
the same for both.
Before performing an on±vehicle inspection, a
check must first be made to confirm that the power
steering system is completely free of any air. If there
is any air in the system, the volume of this air wilt
change when the fluid pressure raised, causing a
fluctuation in the fluid pressure so that the power
steering will not function properly. To determine if
there is any air in the system, check to see if there
is a change of fluid level in the reservoir tank when
the steering wheel is turned fully to the right or left.
For example, if there is air in the system, it will be
compressed to a smaller volume when the steering
wheel is turned, causing a considerable drop in the
fluid level. If the system is free of air, there will be
very little change in the level even when the fluid
pressure is raised. This is because the fluid, being a
liquid, does not change volume when compressed.
The little change in the fluid level is due to expan-
sion of the hoses between the pump and gear hous-
ing when pressure rises.VANE PUMP
The main component parts of the vane pump,
such as the cam ring, rotor, vanes and flow con-
trol valve are high precision parts and must be
handled carefully. Also, because this pump pro-
duces a very high fluid pressure, O±rings are
used for sealing each part. When reassembling
the pump, always use new 0±rings.
In the flow control valve, there is a relief valve
which controls the maximum pressure of the
pump.
The amount of this maximum pressure is very
important; if it is too low, there will be insufficient
power steering assist and if too high, it will have
an adverse effect on the pressure hoses, oil
seals, etc.
If the maximum pressure is either too high or too
low due to a faulty relief valve, do not disas-
semble or adjust the relief valve, but replace the
flow control valve as an assembly.Also, air in the system will sometimes result in
an abnormal noise occurring from the pump or
gear housing when the steering wheel is fully
turned in either direction.
This on±vehicle inspection must be performed
every time to ensure that the power steering
system is working properly after overhauling or
repairing the pump or gear housing.
± STEERINGPower Steering Description)SR±19