Most Commonly Encountered Vehicle Alignment Faults - SICE A 926 Manual De Instrucciones

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MOST COMMONLY ENCOUNTERED VEHICLE ALIGNMENT FAULTS

Cause: tyre side slip.
Invert the position of the wheels on the same axle:
• if the vehicle now tends to wander to the other side, take one of the wheels whose position
you have already inverted and turn the tyre on the rim.
• 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).
Steering wheel is excessively stiff with vehicle stopped.
Possible causes:
• excessive caster.
• incorrect king-pin angle.
• excessive camper.
• low tyre pressure.
Vehicle tends to wander to the left or the right.
Steering wheel not aligned with vehicle trajectory.
Disparity between steering locks.
ATTENTION
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