Introduction; Definition; When Is Wheel Alignment Required; Main Vehicle Alignment Parameter - LAUNCH TECH LAUNCH KWA-300 Manual

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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
Required
l The driver must firmly hold the steering wheel
to maintain a straight-ahead driving.
l Abnormal wear of tires occurred, such as single
side wear, concave-convexity wear and
featheriness wear.
l Too heavy or too light steering, or shaking at
high-speed driving.
l When the tire(s), steering joint or shock
absorber are replaced.
l When the vehicle is impacted.
l When the vehicle has driven for the first
3000km or 10000km.
Main Vehicle
Parameter
The wheel alignment mainly consists of camber,
caster, toe-in, kingpin inclination, toe-out on turns,
wheelbase difference, tread 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.
KWA-300 3D Wheel Aligner
Alignment
Alignment
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.
Camber is measured in degrees.

Kingpin Inclination

Kingpin Inclination (KPI) is the angle of inclination of
the king pin towards the centre-line of the vehicle
from the vertical (see Fig.1.3).
Introduction
Fig.1.1
Fig.1.2