Steering Gear: Adjustments
INSPECTIONBASIC INSPECTION
Clean all disassembled parts, and check for wear, damage, or any other faults, then repair or replace as necessary.
When disassembling, check the inside of gearbox for water. If any water is found, carefully check the boot for damage, input shaft dust seal, adjusting screw and boot clips for poor sealing. If faulty, replace with new parts.
SERVICE LIMIT
Make a measurement as follows. If it exceeds the specified service limit, adjust or replace.
Note: When making a measurement, vise the gearbox by using ST. Never vise the gearbox by inserting aluminum plates, etc. between vise and gearbox.
ST 32005190 STAND
Sliding resistance of rack shaft:
Service Limit 400 N (41 kgf-m, 90 lbs.) or less
RACK SHAFT PLAY IN RADIAL DIRECTION
Service limit: 0.19 mm (0.0075 inch) or less
On Condition
L: 5 mm (0.20 inch)
P: 122.6 N (12.5 kgf, 27.6 lbs.)
Left-turn steering:
Steering limit
Direction 0.3 mm (0.012 inch) or less
Direction 0.15 mm (0.0059 inch) or less
L: 5 mm (0.20 inch)
P: 98 N (10 kgf, 22 lb)
INPUT SHAFT PLAY
In radial direction:
Service limit 0.18 mm (0.0071 inch) or less
On condition
P: 98 N (10 kgf, 22 lb)
In axial direction:
Service limit 0.5 mm (0.020 inch) or less
On condition
P: 20 - 49 N (2 - 5 kgf, 4 - 11 lbs.)
TURNING RESISTANCE OF GEARBOX
Using the ST, measure the gearbox turning resistance.
ST 32005049 SPANNER
Service limit
Maximum allowable resistance 10.5 N (1.1 kgf, 2.4 lb) or less
Difference between right and left turning resistance: Less than 20%
OIL LEAKING
Lift up the vehicle.
Even if the location of the leak can be easily found by observing the leaking condition, it is necessary to thoroughly remove the fluid from the suspected portion and turn the steering wheel from lock to lock about thirty to forty times with engine running, then make comparison of the suspected portion between immediately after and several hours after this operation.
Inspect leakage from "a".
The oil seal is damaged. Replace the valve assembly with a new one.
Inspect leakage from "b".
The torsion bar O-ring is damaged. Replace the valve assembly with a new one.
Inspect leakage from "c".
The oil seal is damaged. Replace the valve assembly or oil seal with a new one.
Inspect leakage from "d".
The pipe is damaged. Replace the faulty pipe or 0-ring.
Inspect leakage from "g".
The hose is damaged. Replace the hose with a new one.
If leak is other than a, b, c, d, or g, and if oil is leaking from the gearbox, move the right and left boots toward tie-rod end side, respectively, with the gearbox mounted to the vehicle, and remove fluid from the surrounding portions. Then, turn the steering wheel from lock to lock thirty to forty times with the engine running, then make comparison of the leaked portion immediately after and several hours after this operation.
Leakage from "e"
The cylinder seal is damaged. Replace the rack bush with a new one.
Leakage from "f"
There are two possible causes. Take the following step first. Remove the pipe assembly B from the valve housing, and close the circuit with ST.
ST 32005196 PLUG
Turn the steering wheel from lock to lock thirty to forty times with the engine running, then make comparison of the leaked portion between immediately after and several hours after this operation.
^ If leakage from "f" is noted again:
The oil seal of pinion and valve assembly is damaged. Replace the pinion and valve assembly with a new one. Or replace the oil seal and parts that are damaged during disassembly with new ones.
^ If oil stops leaking from "f":
The oil seal of rack housing is damaged. Replace the oil seal and the parts that are damaged during disassembly with new ones.
ADJUSTMENT
Adjust the front toe.
Standard of front toe: IN 3 - OUT 3 mm (IN 0.12 - OUT 0.12 inch)
Adjust the steering angle of wheels.
Standard of steering angle:
Inner wheel
34.5° ± 1.5°
Outer wheel
30.3° ± 1.5°
If the steering wheel spokes are not horizontal when wheels are set in the straight ahead position, and error is more than 50 on the periphery of steering wheel, correctly re-install the steering wheel.
If the steering wheel spokes are not horizontal with vehicle set in the straight ahead position after this adjustment, correct it by turning the right and left tie-rods in opposite direction by same angle.