4.6 StraightTrak® LFM (Lateral Force Measurement)
StraightTrak® is an optional feature that corrects vehicle pull problems by suggesting
that the tires be placed at specific locations on the vehicle. If the vehicle being tested
has unidirectional tires, or different size tires front and rear, not all of the displayed
options will be valid.
Tire-related pulls are caused by lateral forces in the tires. Lateral force is the amount
of left or right pull force created as the tire rolls along the road. This condition may
cause a vehicle to steer away from straight ahead. These forces are primarily created
by conicity and cannot be detected during standard balancing or alignment service.
The StraightTrak® LFM feature measures lateral tire force during the
GSP9720JLR
's
“Road Force Measurement” test. The
GSP9720JLR
then applies this lateral force
information to a set of tires, providing the operator with multiple placement choices
about the vehicle. Tires are tagged and positioned on the vehicle to provide the least
amount of vehicle pull and obtain the best straight ahead steering stability. Pull or
drift caused by the lateral forces can be systematically minimized, offset or
eliminated.
Performing a StraightTrak® LFM Procedure:
Mount the tire/wheel assembly centered on the shaft of the
GSP9720JLR
. Use care
to make sure the wing nut is well tightened.
Choose the appropriate balancing procedure for the particular type of rim
construction.
Check the tire pressure. Inflation Station will automatically inflate or deflate the tire to
the preset air pressure. When the tire pressure is correct, the tire graphic on the
screen will turn green.
If tire pressure is not checked before load roller application, an auto prompt for the
Inflation Station will appear.
NOTE:
Lateral force varies significantly with tire inflation pressure.
For accurate results, it is important that the inflation pressure
for each tire is set to the correct value.
Enter rim dimensions by using the inner and outer Dataset® arms.
If using a balancing procedure other than the standard clip-on/clip-on weight,
StraightTrak® Lateral Force Measurement will prompt the operator to measure the
GSP9720JLR Wheel Balancer Operation Instructions
Road Force® Measurement Procedures
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