SOCIETY OFAUTOMOTIVE ENGINEERS, INC. 400Commonwealth Drive, Warrendale, Pa.15096 Dart's 1000 hp Mechanical Drive Off-Highway Trucks Darrell B.Carr Dart Truck Co. Earthmoving Industry Conference Central Illinois Section Peoria, Illinois April 18-20, 1977770549 Downloaded from SAE International by North Carolina State Univ, Tuesday, September 18, 2018Copyright ©Society ofAutomotive Engineers, Inc.1977 Allrights reserved. Downloaded from SAE International by North Carolina State Univ, Tuesday, September 18, 2018770549 Dart's 1000 hp Mechanical Drive Off-Highway Trucks Darrell B.Carr Dart Truck Co. THE PRESSING NEED FOR ADDITIONAL COAL and ore combined with theinflationary trends ofrecent years hascaused themining andconstructionindustries' need forreliable high performing haulage units. Inmid 1974, Dart management made the decision tomeet theindustry need. Areview ofthecustomer's concepts ofoperation andour evaluation tosatisfy thetruck hauling requirements evolved into twomodel trucks. Thetrucks, anend dump and atractor-trailer, each with the same basic prime mover, permit theflexibility ofapplication tocustomer needs. Ourbackground, experience andknowledge ofreliable, proven components lead usinto selecting a1,000 horsepower mechanical drive power train. Thepurpose ofthis paper istodescribe this power train anditsapplication tothebasic chassis inattaining thedesign objectives. OBJECTIVES Engineering wasassigned thetruckproject which included designing, assisting inmanufacture andtesting within one(1)year. Ourmany years oftruck experience assistedusinourdesign objectives oftrucks with: 1.Reliability2. Performance3. Customer acceptance Thecompleted trucks, Model 3100 -100 tonend dump and Model 4150 -150tonbottom dump tractor-trailer, arepictured infigures one(1)and two(2). BASIC TRACTOR Thebasic tractor isequipped with singlefront tires and dual rear tires. The 190" wheel base with wide track axles provides a dynamically stable vehicle fortheoff-highway road conditions. Itispowered bytoday's reliable 1,000 horsepower engines, thelargest proven mechanical power shift transmission and atriple reduction drive axle, resulting intheperformance efficiency ofa4X2drive. All components selected were proven field reliable andthose ofnewdesign were engineer ingtested. Theadditional advantages ofdriver comfort, routine service andmaintenance ABSTRACT Dart's innovation toatried andproven 1,000 H.P.mechanical drive isincorporated into onebasic chassis that isutilized asa twoaxle end dump at100tonand athree axletractor-trailer at150 ton. Astraight-forward approach and asimplified design vehicle wasengineered andtested under controlled laboratory conditionsandalso customer conditions. Thevehicle axles andchassis will also accomodate thenewer tire options that are being offered inthis basic size truck. Dart's purpose with these trucks istooffer themining industry alowcost perton mile vehicle. Downloaded from SAE International by North Carolina State Univ, Tuesday, September 18, 20182 were considered anddesigned into thebasic tractor. POWER TRAIN Theengines selected aretheDetroit Diesel 12V-149T (1,000 gross horsepower) and the Cummins KTA2300C-1050 (1,050 gross horsepower). Both areturbo-charged andhave logged many hours offield operation. Theengine package ismodule mounted forefficient servicing andoverhaul asillustrated infigure three (3). Theengine temperatureiscontrolled with a60"diameter suction fanand a29square foot frontal area radiator with bolted attachment topandbottom tanks. Constant engine temperature ismaintained through theuseofradiator shutters anda molded fiberglass fanshroud forair flow efficiency. Thetoptank, with deaerating capability, includes sufficient drawndown volume forroutine water level maintenance. Located below theradiator bottom tank isatorque converter-retarder shell andtube heat exchanger forefficient cooling ofthetransmission fluid. Theengine intake airpasses through two (2)Donaldson Model SRG-20 aircleaners mount