Spicer Drive Axles Application Guidelines - Manual (Page 9)

AXAG-0200 June 2009 9
Construction/Agriculture
Vocational Description
n Movement of material to, from, or around a job site
n 90% of loaded operation on prepared road surfaces of concrete, asphalt, gravel, crushed rock or hard packed dirt and up to
10% of loaded operation into sandy or muddy work areas.
n Liftable tag and pusher axles are often used to increase legal load capacity on highway.
n Vehicles typically operate a high percentage of time off-highway making a high number of stops and starts.
n Straight trucks as well as trucks with equipment trailers are considered construction vehicles. Tractor / semi-trailers and
straight trucks pulling material trailers or dump body pups will be considered mining applications and should be reviewed
based on guidelines established for that vocation.
Typical Vehicle Types
Asphalt Truck End Dump Mixer Utility Truck
Block Truck Flatbed Truck Snowplow/Snowblower Bucket Truck
Concrete Pumper Landscape Truck Tank Truck Stake Body Truck
Crane Truck Feedlot Truck
Service Definitions
Operation 1
GVW / GCW - straight trucks and straight trucks with equipment trailers. Grades up to 12%.
General Requirements and Recommendations
•
Additional ratios may be available and would require individual application approval.
•
Double reduction models offer added durability and gross weight capability in severe service applications where higher
numerical ratios are required.
•
Maximum allowable torsional driveline acceleration is 300 rad./sec./sec. within the defined operating speed range of the
engine manufacturer. 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 Construction vocation.
•
Use of dual retarders (engine, exhaust, transmission, or electromagnetic) is only approved with tandem and tridem axle
models with gross axle weight ratings of 46,000 lb or higher and maximum allowable retardation is limited to 100% of max.
rated engine torque.
•
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 or tandem / tridem axles with GAWR ratings of 44,000 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)