Spicer Drive Axles Application Guidelines - Manual (Page 16)

AXAG-0200 June 2009 16
Heavy Haul
Vocational Description
n Movement of heavy equipment or materials at legal maximums or special permit loadings
n Exclusive operation on prepared road surfaces of concrete, asphalt and maintained gravel
n High horsepower engines and auxiliary transmissions are typically used
n Loaded going and empty return
n Infrequent stops
Typical Vehicle Types
Equipment Hauling
Flatbed
Lowboy
Steel Hauling
Service Definitions
(Vocational descriptions applies to all operations.)
Operation 1
Grades up to 8%
Operation 2
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 Heavy Haul vocation.
•
Use of dual retarders (engine, exhaust, transmission, or electromagnetic) is only approved with tandem axle models with
gross axle weight ratings of 46,000 lb or higher and maximum allowable retardation is limited to 110% 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
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)