SICE A 948 Manual De Instrucciones página 111

• if the wander direction does not change perform the same operation on the wheels of the
other axle.
• if this double inversion procedure fails to solve the problem, check that camber values on the
same axle are identical, make the same comparison for caster values.
Possible causes:
• mechanical backlash.
• ROC has been skipped or performed incorrectly.
• wheel alignment performed with the steering wheel off centre.
• front wheels adjusted with respect to the axis of symmetry instead of the thrust axis.
• Manual procedure:
- The steering box range must be centred by counting the number of steering wheel
revolutions from full lock to full lock.
- Position the steering wheel in the centre of its range and perform the normal procedure for
adjustment of the front half-toe values.
- Position the steering wheels correctly, disassembling it from the steering column if needs be.
• Electronic procedure:
- The steering box range must be centred by using the intended aligner procedure (See
STEERING ANGLE WINDOW paragraph).
Possible causes:
• excessive caster.
• incorrect king-pin angle.
• excessive camper.
• low tyre pressure.
Steering wheel return is too low or too forceful when driving.
• Incorrect caster value - adjust.
• tyres with irregular wear on both walls: incorrect pressure - under-inflated.
• tyre with irregular wear in the centre of the thread: incorrect pressure - over-inflated.
• tyre wear with stepped profile: shock absorber nor working properly.
• tyres on the same axle with irregular wear on a single wall: toe values are out of tolerance.
• only one tyre on the same axle with an irregularly worn wall: camber out of tolerance.
• Adjust total toe to the manufacturer's specifications.
• Set the left and right front toe values so that they are identical.
• Remove the steering wheel from the steering column and move it to the correct position; if the
steering wheel has adjustment slots, use them.
• Before making any adjustments start the engine, turn the steering wheel to full lock in both
directions, position it in the centre of its turning range and immobilize it.
• With the exception of vehicles for which manufacturer's specifications indicate adjustment with the
engine running only, the engine can be switched off or left running during adjustments, as preferred.
Steering wheel not aligned with vehicle trajectory.
Disparity between steering locks.
Steering wheel is excessively stiff with vehicle stopped.
Vehicles with just one register.
Adjusting vehicle with power steering.
Tyre wear.
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