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58
WHEEL GEOMETRY
Each line corresponds to a deviation of 2 mm, so the deviation
between the two wheels is equal to 10 mm (5 x2).
For vehicles with torsion bar suspension:
After determining which is the defective wheel, check its
conditions and the exact assembly dimension of the upper and
lower tie rods of the wheel suspension.
If the tie rods have been subject to deformations, replace
them; if the assembly dimension is wrong, screw or unscrew
the tie rod on the king-pin so that the vehicle wheel base is
adjusted and the wheel are on the same axis.
NOTE
In order not to change wheel caster angle, a
lengthening or shortening of the lower tie rod must
correspond to a lengthening or shortening of the
upper tie rod.
For vehicles with transverse leaf spring
suspension:
The deviation error may be due to deformation of the frame
or of the assemblies connected to the wheels.
Checking camber
Figure 19
When the front wheels are aligned to the rear ones and the
detectors are on an horizontal plane, press the key wheel
camber (2) the LED lights up and the display (1) shows the
camber angle value.
Base - March 2006
Checking king-pin angle and caster angle
Figure 20
When the front wheels are aligned to the rear ones, loosen
the knurled knobs (3) and zero the graduated sector (2) on
the index (1) of the floating disc.
Figure 21
Steer the wheel 20° toward the inside; press twice the king-pin
camber push-button (2), the LED lights up and the display (1)
shows 9 horizontal lines.
Figure 22
32821
Steer the wheels 20° toward the outside, press the king-pin
camber push-button (2) and the display (1) shows the king-pin
camber angle.
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