Most Commonly Encountered Vehicle Alignment Faults - Nussbaum WA 780 Betriebsanleitung

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MOST COMMONLY
ENCOUNTERED
VEHICLE ALIGNMENT
FAULTS
Vehicle tends to wander to the left or
the right.
Cause: tyre side slip.
Servicing: Invert the position of the wheels
on the same axle:
• if movement is inverted, turn one of the
two wheels where the position has been
inverted, on its rim.
• if movement is not inverted, turn the
position of the wheels on the other axle.
• if this double inversion procedure fails to
solve the problem, check that camber val-
ues on the same axle are identical. make
the same comparison for caster values.
User Manual WA 780 - Cura S 780
Steering wheel not aligned with vehicle
path
Possible causes:
• mechanical backlash.
• compensation has been skipped or per-
formed 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.
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 cen-
tre 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 col-
umn.
Steering wheel is excessively stiff with
vehicle stopped.
Possible causes:
• excessive caster.
• incorrect king pin angle.
• excessive camber.
• very low tyre pressure.
Steering wheel return is too low or too
forceful when driving.
Incorrect caster value - adjust it.
Tyre wear.
• tyres with irregular wear on both sides:
incorrect pressure - under-inflated.
• tyre with irregular wear in the centre of the
thread: 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: toe values are out of
tolerance.
• only one tyre on the same axle with an
GB
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