Spicer Drive Axles Application Guidelines - Manual (Page 44)

AXAG-0200 June 2009 44
School Bus
Vocational Description
n Transporting students to and from school and/ or school sponsored events
n Operation on prepared road surfaces of concrete, asphalt, maintained gravel, crushed rock, or hard packed dirt
n 2 stops per mile are considered typical
n Automatic transmissions are typical
n 100% load going / empty return (typical)
Typical Vehicle Types
Front Engine Commercial Chassis Front Engine Integral Coach
Rear Engine Integral Coach
Vehicle Configuration
4 x 2 straight bus
Service Definitions
Operation 1
Grades up to 20%
General Requirements and Recommendations
•
Additional ratios may be available and would require individual application approval.
•
Maximum allowable torsional driveline acceleration is 300 rad./sec./sec. within the defined operating speed range of the
engine manufacturer. If applicable, the use of a soft dampened clutch with a manual transmission is recommended.
•
Single vehicle retarders can be approved with all axle models, provided the product selected meets all the application
requirements of the School Bus vocation.
•
All Electromagnetic retards, such as Telma, require individual application approval by the Dana CVP Application
Engineering Department.
•
This Guideline applies to vehicles operating in the U.S.A. and Canada only. Operation in other countries requires individual
approval by the Dana CVP Application Engineering Department.
•
For optimum axle shaft retention to the hub, .750” dia. studs or .625” dia. studs with tapered dowels are recommended for
single axles with GAWR ratings of 23,000 lbs and above. OEMs are responsible for axle shaft retention on all units not
dressed by Dana. See page 80 for illustration.
•
Localized sources of heat, such as engine exhaust, that may cause high axle operating temperatures or reduced seal life are
to be avoided. Maximum intermittent drive axle surface temperature measured at input seal not to exceed 300° F for more
than 30 minutes. Maximum continuous operating temperatures not to exceed 250° F.
•
Dana CVP application approval is required for all vehicles with hybrid power systems.
Housing Structural Ratings
(see table of contents)