Steering Gear: Testing and Inspection
Steering GearboxINSPECTION
BASIC INSPECTION
1) Clean all the disassembled parts, and check for wear, damage or any other faults, then repair or replace as necessary.
2) 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.
LIMIT
Make a measurements as follows. If it exceeds the specified service limits, adjust or replace.
NOTE:
When making a measurement, vise the gearbox using ST. Never vise the gearbox by inserting aluminum plates etc. between vise and gearbox.
ST1 926200000 STAND
ST2 34199AG000 BOSS D
Rack shaft sliding resistance:
Limit
343 N (35 kgf, 77 lb) or less
RACK SHAFT PLAY IN THE RADIAL DIRECTION
Right-turn steering:
Limit
0.4 mm (0.016 in) or less
Condition
L: 5 mm (0.20 in)
P: 98 N (10 kgf, 22 lb)
Left-turn steering:
Limit
Direction (White Arrows)
0.6 mm (0.024 in) or less
Direction (Black Arrows)
0.4 mm (0.016 in) or less
INPUT SHAFT PLAY
In radial direction:
Limit
0.26 mm (0.0102 in) or less
Condition
P: 98 N (10 kgf, 22 lb)
In axial direction:
Service limit
Without play
Condition
P: 20 - 49 N (2 - 5 kgf, 4 - 11 lb)
TURNING RESISTANCE OF GEARBOX
Using the ST, measure the gearbox turning resistance.
ST 34099PA100 SPANNER
Service limit:
Maximum allowable resistance:
10.5 N (1.1 kgf, 2.4 lb) or less
Difference between right and left turning resistance:
20% or less
OIL LEAKAGE
1) Lift up the vehicle.
2) If a fluid leak is found, clean the fluid completely from the suspect area, and turn the steering wheel 30 to 40 times to the left and right from lock to lock, with the engine running, and check again for leaks immediately, and also after a few hours have passed.
3) Cause and solution for oil leakage from "a"
The oil seal is damaged. Replace the valve assembly or oil seal with a new part.
4) Cause and solution for oil leakage from "b"
The torsion bar O-ring is damaged. Replace the valve assembly with a new part.
5) Cause and solution for oil leakage from "c"
The oil seal is damaged. Replace the valve assembly or oil seal with a new part.
6) Cause and solution for oil leakage from "d"
The pipe is damaged. Replace the faulty pipe or Oring.
7) Cause and solution for oil leakage from "g".
The hose is damaged. Replace the hose with a new part.
8) If leak is other than a, b, c, d or g, or if oil is leaking from gearbox, move the right and left boots toward tie-rod end side, respectively, with the gearbox mounted to the vehicle, and remove fluid from surrounding portions. Then, turn the steering wheel from lock to lock about 30 to 40 times with the engine running, then re-inspect the leaking area immediately after and several hours after this operation.
(1) Leakage from "e"
The cylinder seal is damaged. Replace the rack bushing with a new part.
(2) Leakage from "f"
There are two possible causes. Perform the following step first. Remove the pipe assembly B from the valve housing, and close the circuit using ST.
ST 926420000 PLUG
Turn the steering wheel from lock to lock approx. 30 to 40 times with the engine running, then inspect the leaked portion 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 & valve assembly with a new part. Or replace the oil seal and the parts that are damaged during disassembly with new parts.
^ If oil stops leaking from "f":
The oil seal of rack housing is damaged. Replace the oil seal and parts that are damaged during disassembly with new parts.