Improper Use; Most Commonly Encountered Vehicle Alignment Faults - Corghi Exact 70 Manuel D'utilisation

ImProPEr USE

The Personal Computer installed in the central unit
should only be used with the programs supplied
by CORGHI S.p.A.
ATTENTION
You are strongly advised not to use the Personal
Computer for games or with other software based
on unauthorised copies, to avoid reducing the
safety of plants and persons. This is mandatory to
avoid any possible contamination from viruses.
In any case, you are advised to check the compat-
ibility of all original software not supplied by CORGHI
S.p.A. with the Corghi Technical Service.
ATTENTION
Do not remove the Personal Computer from its
installation position to avoid any damage to the
connections.
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 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.
Steering wheel not aligned with vehicle trajec-
tory.
Possible causes:
- mechanical backlash;
- Compensation has been skipped or performed
incorrectly;
- wheel alignment performed using two sensor
procedure;
- wheel alignment performed with the steering
wheel off centre;
- front wheels adjusted with respect to the axis of
symmetry.
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Disparity between steering locks.
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, clamp the steering wheel 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.
Steering wheel is excessively stiff with vehicle
stopped.
Possible causes:
- excessive caster;
- incorrect king pin angle;
- excessive camber.
Steering wheel return is too forceful or insufficient
when driving.
Incorrect caster value - adjust.
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 ab-
sorber 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 irregularly
worn side wall: camber out of tolerance.
Vehicles with one register only.
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 cars 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 mat-
ter whether the engine is left running or stopped,
except for cars where adjustment with the engine
on is specified.
Vehicles with air-hydraulic or active suspen-
sions.
Adjust the vehicle with the engine running and the
suspensions at the normal height for use.
Operator's Manual EXACT 70