Specifications

A-109
SOFTEK for Blue Bird Buses
FRONT AIR MODULE SUSPENSION ALIGNMENT SPECIFICATION
CAMBER
1
DESIGN SPECIFICATION
RANGE
MINIMUM MAXIMUM
LEFT 0.00º ± 1.0º -1.0º +1.0º
RIGHT - 0.25º ± 1.0º -1.25º +0.75º
CROSS Max 2.0º — —
CAMBER NOTES:
1
The camber angle is not adjustable. Do not bend axle or otherwise try to adjust camber. If found out of specification, notify
Hendrickson Tech Services for further information.
CASTER
1,2
DESIGN SPECIFICATION
RANGE
8K/10K 13.2K/14.6K
8K/10K 13.2K/14.6K MINIMUM MAXIMUM MINIMUM MAXIMUM
LEFT 4.5º ± 1º 4.5° ± 1.5° +3.5º +5.5º +3.0º +6.0º
RIGHT 4.5º ± 1º 4.5° ± 1.5° +3.5º +5.5º +3.0º +6.0º
CROSS
3
Max 1.0º — — — —
CASTER NOTES:
1
Caster is determined with the vehicle at specified ride height for air suspension or at rated load for mechanical suspension
systems. It is critical that the vehicle front and rear ride height is within specifications prior to performing a caster
measurement or adjustment. See Hendrickson ride height specifications and procedure.
2
In most cases actual vehicle caster is defined with the frame rails at zero slope. Refer to the vehicle manufacturer’s
specifications for correct frame rail slope. (Both the alignment surface and the vehicle’s frame rails should be level during
execution of alignment procedures). For vehicles with a positive frame rake (higher in rear) add the frame slope (in
degrees) to the caster reading to determine true vehicle caster.
3
The Cross caster angle is not adjustable – Do not bend axle or otherwise try to adjust cross caster. If found out of
specifications notify Hendrickson Tech Services for further information. Changes to caster can be attained by using caster
shims as provided by the vehicle manufacturer or chassis and body manufacturer. Caster shims must match, side to side,
to reduce uneven loading to the suspension components. The use of two different angle caster shims will not correct
cross caster.
4
Example of caster adjustment: 2.5º RH/3º LH, would require one, 1.0 shim on each side to increase caster and achieve
3.50° RH/4.00° LH, which is in specification. Do not attempt to use uneven shims.
Hendrickson recommends following TMC
2
practices:
DESIGN SPECIFICATION¹
RANGE
MINIMUM MAXIMUM
TOTAL TOE
2
1
/ 16 " ±
1
/ 32 " (0.06" ± 0.03")
1
/ 32 " (0.03")
3
/ 32 " (0.09")
TOE-IN NOTES:
1
Toe-in is to be set and adjusted in the normal vehicle unladed configuration. Actual vehicle curb weight on the ground. Toe
should be checked at the tires front and rear tread center, at a distance above ground equal to the tire's rolling radius.
2
In most instances total toe is set by the vehicle manufacturer or body builder. Consult the vehicle manufacturer for
specifications.
17730–248 Appendix
A-109
SERVICE MANUAL
L
151
FRONT AXLE & SUSPENSION
1
APPENDIX