Most Commonly Encountered Vehicle Alignment Faults - Corghi EXACT BlackTech X Manuel D'utilisation

Eichstädt Elektronik - Professionelle Kfz-Diagnosegeräte
moST CommoNLY
ENCoUNTErED VEHICLE
ALIGNmENT FAULTS
Vehicle tends to wander to the left or the
right.
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 per-
form 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 compari-
son for caster values.
Steering wheel not aligned with vehicle path
Possible causes:
- Mechanical backlash.
- Compensation has been skipped or performed
incorrectly.
- wheel alignment performed using the two-
target procedure.
- wheel alignment performed with the steering
wheel off centre.
- Front wheels adjusted with respect to the axis
of symmetry.
Disparity between steering locks.
The steering box range must be centred by
counting the number of steering wheel revolu-
tions from full lock to full lock.
Position the steering wheel in the centre of its
range, clamp the steering wheel and perform
the normal procedure for adjustment of the front
half toe values.
Position the steering wheels correctly, disassem-
bling it from the steering column if needs be.
Steering wheel is excessively stiff with vehicle
stopped.
Possible causes:
- Excessive caster.
- Incorrect king pin angle.
- Excessive camber.
Steering wheel return is too low or too forceful
when driving.
Incorrect caster value - adjust.
74
Tyre wear.
- Tyres with irregular wear on both side walls:
incorrect pressure - under-inflated.
- Tyre with irregular wear in the centre of the
tread: incorrect pressure - over-inflated.
- Tyre wear with stepped wear profile: shock
absorber not working properly.
- Tyres on the same axle with irregular wear on
a single side wall: toe out of tolerance.
- Only one tyre on the same axle with an ir-
regularly worn side wall: camber out of toler-
ance.
Vehicles with just one register.
Adjust the total toe to the value specified by
the manufacturer.
Set the two front half-toes so that they are
equal.
Remove the steering wheel from the steering
column and move it to the correct position; if the
steering wheel has adjustment slots, use them.
Adjusting vehicle with power steering.
Before making the adjustments start the engine,
turn the steering wheel to the limit position in
both directions, set the steering-wheel correctly
and lock it in place.
During the adjustment operations it does not
matter whether the engine is left running or
stopped, except for cars where adjustment with
the engine on is specified.
Vehicles with hydro-pneumatic or intelligent
suspension systems.
Adjust the vehicle with the engine running and
the suspensions at the normal height for use.
Vehicles with fixed rear axle.
The rear axle should still be measured to iden-
tify any excessive anomalies, after which adjust
the front-half-toes in relation to the thrust axis;
this eliminates the crooked steering-wheel
problem.
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Operator's manual EXACT BlackTech X