785 c Introduction

Caterpillar Product Information

Salesgram

For Dealer Sales Personnel

August 1998

Cat 785C/789C/793CMining TruckIntroduction

Caterpillar mining trucks have become the industry standard forefficiency, productivity and durability since their introduction in1984, with over 3,300 trucks shipped. With the introduction of theC-Series mining trucks the 793C in late 1996, and the785C/789C models scheduled for late 1998, additionalenhancements have been made to the entire mining truck productline to help increase machine life and reduce operating costs.

Major enhancements include: Cat 3500 B-Series engine Redesigned operators station Integration and improvements to electronic controls Improved serviceability

2Designed and manufactured by Caterpillar, the durable and reliable3500 B-Series engine is the result of proven technology andperformance. The 3500B engine is the heart of the C-Series powertrain, providing customers with the lowest cost-per-ton haulingalternative.

The Cat 3500 B-Series engine offers the following improvementsto the 785 and 789 C-Series mining trucks (these improvementswere made to the 793C when it was introduced in late 1996):

Higher Horsepower RatingsHorsepower ratings increased by five percent for the 785Cand 789C. Engine power for the 785C increased from 1380 hp(1029 kW) to 1450 hp (1082 kW), while the 789C increased from1800 hp (1342 kW) to 1900 hp (1417 kW). Horsepower for the793C remains unchanged at 2300 hp (1715 kW).

Improved Fuel Injection SystemBrake Specific Fuel Consumption has improved 3 to 4 percent asa result of 22 percent higher fuel injection pressures and shorterinjection cycles. Emissions (NOx) and oil sooting have also beenreduced as a result of these enhancements to the fuel injectionsystem. Camshafts, cam followers, push rods, rocker arms, andgear train components were all strengthened in response to thesesystem changes.

3500 B-Series Engine

Improved Air SystemB-Series engines breathe easier due to the followingimprovements: Improved inlet and exhaust system for streamlined air flow

through the combustion chamber. Redesigned Separate Circuit Aftercooler System (SCAC). Redesigned camshaft for increased valve lift and improved

inlet/exhaust air exchange.

Electronic Control Module (ECM)The 3500Bs Electronic Control Module (ECM) stores and selectsthe appropriate injection timing and air/fuel ratio mixture for anyoperational situation by monitoring sensors throughout the engine,torque converter, transmission, and operators control station. TheECM has been enhanced with the following additional features: Exhaust temperature derating for extended component life. Automatic ether injection protects engine componentry. Flash programmable ECM memory for efficient system updates. Expanded system sensing, including: coolant flow, rear aftercooler

temperature, engine oil level, engine oil filter pressure/restriction,turbo exhaust temperature, engine fan speed, air conditionercompressor pressure and engine crankcase pressure.

Overspeed monitoring, warning and self-protection. Acceleration delay on start-up for extended component life. Elevated low idle boosts efficient operating temperatures. Air filter restriction deration protects operating components. Fan clutch control (optional). Oil Renewal System control (optional). Pre-lubrication control (optional). Radiator Shutter control (optional).

Extended Service IntervalsService intervals have been extended from 250 to 500 hours foroil, oil filter, and fuel filter changes, reducing service time andincreasing machine availability.

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Major design improvements have been made to the operatorsstation on all three C-Series trucks to enhance operator comfort,minimize fatigue, and maximize productivity.

Improved Ergonomics Electronically controlled body hoist control provides better

modulation and ease of operation. This hoist control ishydraulically snubbed for improved comfort.

Operators seat adjustments improved for better comfort. New telescopic/tilt steering column provides improved access

and operator comfort. Repositioned pedal controls provide easier, more natural actuation. New integrated electronic control for intermittent windshield

wiper, washer and turn signal for improved reliability. Enhanced instrument layout with backlit rocker switches for

improved visibility. Electric horn control mounted on steering wheel for easier access.

Enhanced Operator Comfort More powerful heating and air conditioning system provides

enhanced reliability and performance. Secondary brake control moved from column lever to floor pedal

for easier access. Operators seat redesigned and armrests added for improved

comfort. Increased operator and passenger space provides more leg room

and storage space. Power window added to drivers side for ease of operation. Cab is radio ready with provision for add-on communication

packages for added versatility. Soft grey interior color reduces glare and adds to operators

perception of spaciousness.

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Operators Station

Updated Electronic Control Module (ECM)The Electronic Control Module (ECM) on 3500 B-Series engineshas been enhanced and updated with a number of new features.(See engine improvements for more details).

A new Electronic Control Module, Transmission and ChassisControl (TCC), replaces EPTCII and incorporates several newsystem improvements. TCC communicates over the CAT DataLink with the engine ECM to manage engine speed during shiftsfor increased clutch life and operator comfort. TCC also controlsbody hoist, neutral start, rear axle filtration, and automaticlubrication functions.

Brake CircuitsBrake circuits have been integrated on all three C-Series trucksto provide operators with the brake system confidence andperformance they have come to expect from Cat trucks throughthe new Integrated Braking Control (IBC) system. This systemincorporates all the advantages of the proven Traction ControlSystem (TCS), Automatic Retarder Control (ARC) system, andnormal brake control systems into one simplified control modulelocated in the rear of the operator station.

Vital Information Management System (VIMS)Caterpillars Vital Information Management System (VIMS), anintelligent machine management tool, provides operators, servicepersonnel, and managers with information on a wide range ofmachine functions. VIMS has been redesigned to relocate sensormodules in the rear of the operators station on all three C-Seriestrucks for improved reliability and serviceability.

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Electronic Controls

Circuit BreakersCircuit breakers have replaced fuses, providing additionalprotection of electrical systems and improved serviceability.

Consolidated Electronic ControlsElectronic controls, including: Integrated Braking Control (IBC),Vital Information Management System (VIMS), and the Transmissionand Chassis Control Module (TCC), have been consolidated forsimpler troubleshooting.

Heating and Air Conditioning SystemThe heating and air conditioning unit has been relocated to thefront of the operators station for easier serviceability, removaland installation.

Turn SignalsTurn signal and amber lamps have been redesigned and nowfeature LED lamps for improved visibility and longer life.

Significant improvements have been made to the 789C coolingsystem to improve engine cooling, efficiency and emissions.

Larger Radiator CapacityThe capacity of the 789C cooling system has been expanded40 percent by increasing the capacity of the radiator from 474 L(125 gal) to 663 L (175 gal).

Shunt TankA shunt tank has been added to the cooling system, providingpositive pressure at the coolant pump inlet to prevent cavitationin high flow conditions.

Larger FanThe fan diameter increased from 70 to 78 inches, and the numberof blades increased from 8 to 11 for improved cooling efficiency.

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Improved Serviceability

Improved Cooling Systemon 789C

7Metric EnglishPayload 118-136 130-150

metric tons U.S. tonsStandard Body Capacity:

Struck 57.0 m3 74.0 yd3Heaped 2:1 (SAE) 78.0 m3 102.0 yd3

Body Capacity with sideboards 460 mm (18")


Standard Empty Machine Weight (approximate) 94 922 kg 209,302 lbMaximum Gross Vehicle Machine Weight 249 480 kg 550,000 lbEngine Cat 3512B EUIRated Speed 1750 rpmEngine Power:

Gross 1082 kW 1450 hpNet 1005 kW 1348 hp

Wheel Base 5180 mm 17'0"Turning Diameter 27.5 m 90'2"Steering Angle 36 degreesFuel Tank Capacity (standard) 1893 L 500 galTop Speed 54.8 km/hr 34.0 mphTransmission Speeds 6F - 1RBrake Surface Area 150 962 cm2 23,405 in2

785C Brief Specifications

8789C Brief Specifications Metric EnglishPayload 154-177 170-195








9Metric EnglishPayload 218 240








793C Brief Specifications

TELQ4459August 1998

www.CAT.com

1998 CaterpillarPrinted in U.S.A.

The information contained herein is intended for circulation only to Caterpillar and dealer employees whose duties require knowledge of such reports and isintended exclusively for their information and training. It may contain unverified analysis and facts observed by various Caterpillar or dealer employees. However,effort has been made to provide reliable results regarding any information comparing Caterpillar built and competitive machines. Effort has been made to use thelatest available spec sheet and other material in the full understanding that these are subject to change without notice. Any reproduction of this release withoutthe foregoing explanation is prohibited.

3500 B-Series EngineHigher Horsepower RatingsImproved Fuel Injection SystemImproved Air SystemElectronic Control Module (ECM)Extended Service Intervals

Operators StationImproved ErgonomicsEnhanced Operator Comfort

Electronic ControlsUpdated Electronic Control Module (ECM)Brake CircuitsVital Information Management System (VIMS)

Improved ServiceabilityCircuit BreakersConsolidated Electronic ControlsHeating and Air Conditioning SystemTurn Signals

Improved Cooling System on 789CLarger Radiator CapacityShunt TankLarger Fan

785C Brief SpecificationsPayload



Documents

785 c Introduction