Launch KWA-300, User Manual

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LAUNCH KWA-300 3D Wheel Aligner Introduction
1-1
Introduction
Thank you for using KWA-300 3D wheel aligner
manufactured by LAUNCH TECH CO., LTD.
Definition
KWA-300 3D Wheel Aligner is a precision measurement
instrument designed to measure the wheel alignment
parameters and compare them with the specifications
provided by vehicle manufacturer. It also gives
instructions to the user for performing corresponding
adjustments so as to get the best steering performance
and reduce tire wear.
When Is Wheel Alignment
Required
z
The driver must firmly hold the steering wheel to
maintain a straight-ahead driving.
z Abnormal wear of tires occurred, such as single
side wear, concave-convexity wear and
featheriness wear.
z Too heavy or too light steering, or shaking at
high-speed driving.
z
When the tire(s), steering joint or shock absorber
are replaced.
z
When the vehicle is impacted.
z
After the vehicle has run for the first 3000km or
10000km.
Main Vehicle Alignment
Parameter
The wheel alignment mainly consists of camber, caster,
toe-in, steering axle inclination, toe-out on turns,
wheelbase difference, track width difference, etc. They
are designed mainly to improve the steering
performance and driving stability of the vehicle, and
reduce tire wear.
Toe-in and Toe-out
The toe setting is the amount by which the front or rear
wheels point inwards or outwards at the front of the
wheel in relation to each other (see Fig.1.1).
When the wheels point inwards they are said to toe-in,
toe-in figures are given a positive value. Conversely
when the wheels point outwards they are said to be
toe-out and the figures are shown as a negative value.
Fig.1.1
The purpose of correct toe is to ensure that the wheels
run parallel when the vehicle is driving. An incorrect toe
setting may affect the stability and controllability of the
vehicle.
Camber
Camber is the leaning of the wheel inwards or outwards
from the vertical.
If the road wheel leans outwards from the vertical, it is
said to have positive camber and when leaning inwards
from the vertical - negative camber, looking from the
front or rear of the vehicle. See Fig.1.2.
Fig.1.2
Camber is measured in degrees.
Steering axle inclination
Steering axle inclination (SAI) is the angle of inclination
of the king pin towards the centre-line of the vehicle from
the vertical (see Fig.1.3).