Specifications

Alignment & Adjustments 40 17730-248
AIRTEK
®
•
SOFTEK
®
for Blue Bird Buses
FIGURE 8-8
Toe-Out on Turns — (See Ackermann Geometry).
Excessive turning angles such as those encoun-
tered in pickup and delivery operations may
contribute to premature tire wear. Be advised that
the greater the turning angles, the more that toe
and camber change. If you have any doubt
regarding the optimum turning angles for your
operation, contact the vehicle’s manufacturer, axle
OEM, tire OEM and alignment equipment manu-
facturer for advice.
Total Toe — The angle formed by two horizontal
lines through the planes of two wheels. Steer axle
toe Is adjustable to reduce wear to the leading
edge of the tire and also to avoid road wander. Toe
is adjusted in a static, unloaded condition so that
the tires will run in a straight line under a dynam-
ic, loaded condition.
INSPECTION PRIOR TO ALIGNMENT
WHEELS AND TIRES
Examine the following items:
■
The tires are inflated to the manufacturer’s specified tire pressure.
■
The steer axle tires are the same size and type.
■
The lug nuts are tightened to manufacturer’s specified torque.
■
The wheels are balanced and check for tire to rim runout.
■
The wheels and tires are free of excessive wear and damage.
■
Wheel bearing end play is within OEM specification.
FRONT SUSPENSION
Inspect the following:
■
All fasteners are installed and tightened to the specified torque. See Torque
Specification Section in the appendix of this publication.
■
Leaf springs are free of wear or damage.
■
Air springs are free of wear or damage (if equipped).
■
Shock absorbers are free of wear and damage.
■
Vehicle ride height for both the front and rear are within specification. Follow manu-
facturer's guidelines (if equipped).
■
Front and rear spring mounts for wear or damage.
INSPECT TIE ROD ENDS
Perform the “Tie Rod Inspection” procedure, refer to the Preventive Maintenance Section of
this publication.
TOE-OUT TOE-IN
L
82
1
APPENDIX
SERVICE MANUAL