Spicer Drive Axles Application Guidelines - Manual (Page 22)

AXAG-0200 June 2009 22
Linehaul
Vocational Description
n Long distance transport of various types of freight in high mileage operation (min 60,000 miles/year)
n Exclusive operation on road surfaces of good to excellent concrete or asphalt
n Vehicle routes are typically on limited access highways and exceed 30 miles between starts and stops
n Maximum infrequent grades of up to 8%
n Majority of vehicles are 4 x 2, 6 x 2 (fixed tag or pusher ) and 6 x 4 tractor /trailer combinations and some straight trucks
Typical Vehicle Types
Auto Hauler Flatbed Trailer Refrigerated Freight Pipe Hauler
Bulk Hauler Van Trailer Livestock Hauler Tanker
Doubles Grain Hauler Moving Van Triples
Service Definitions (interstate highways, turnpikes and limited access roadways)
Operation 1
Grades up to 3%
Operation 2
Infrequent grades up to 8%
General Requirements and Recommendations
•
Additional ratios may be available and would require individual application approval.
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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.
•
A soft dampened clutch is required for application approval of the DS404/405 and the DST40/41 tandems in vehicles
equipped with engines capable of producing more than 1650 lb-ft of torque.
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Single vehicle retarders can be approved with all axle models, provided the product selected meets all the application
requirements of the Linehaul vocation.
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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 110% of max.
rated engine torque.
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All Electromagnetic retards, such as Telma, require individual application approval by the Dana CVP Application
Engineering Department.
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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.
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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 81 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)