Power Train - Engine
The Cat® 3512B EUI twin turbocharged and aftercooled diesel engine delivers high power and reliability in the world’s most demanding mining applications.
EngineThe Cat® 3512B EUI twin turbocharged and aftercooled diesel engine delivers high power and reliability in the world’s most demanding mining applications.
DesignThe 3512B is a 12-cylinder, four-stroke design that uses long, effective power strokes for more complete fuel combustion and optimum fuel efficiency.
EPA CompliantWhere applicable, the 3512B engine is compliant with U.S. Environmental Protection Agency emission requirements.
Altitude CompensationDesigned for maximum operating efficiencies at altitudes under 3048 m (10,000 ft).
High Torque RiseThe 23 percent net torque rise provides unequalled lugging force during acceleration, on steep grades and in rough underfoot conditions. Torque rise effectively matches transmission shift points for maximum efficiency and fast cycle times.
Enhanced LifeHigh displacement, low rpm rating and conservative horsepower ratings mean more time on the haul roads and less time in the shop.
Separate Circuit AftercoolerAllows the aftercooler circuit to operate cooler than jacket water temperature for a denser air charge and greater combustion.
Engine ProtectionComputerized system electronically protects the engine during cold starts, air filter plugging, high exhaust temperature and engine overspeed (ARC).
Electronic Control Module (ECM)Utilizes advanced engine management software to monitor, control and protect the engine utilizing self-diagnosing electronic sensors. The computerized system senses operating conditions and power requirements and adjusts engine for peak performance and most efficient operation and at all times.
Power Train - Transmission
Cat mechanical power train delivers more power to the ground for greater productivity and lower operating costs.
Mechanical Power TrainThe Cat mechanical drive power train and power shift transmission provides unmatched operating efficiency and control on steep grades, in poor underfoot conditions, and on haul roads with high rolling resistance.
1) TransmissionThe Cat six-speed planetary power shift transmission is matched with the direct-injection 3512B diesel engine to deliver constant power over a wide range of operating speeds.
Robust DesignDesigned for the higher horsepower of the 3512B engine, the proven planetary power shift transmission is built tough for long life between overhauls.
Transmission Chassis Control (TCC)TCC uses electronically transferred engine rpm data to execute shifts at preset points for optimum performance, efficiency and clutch life.
2) Lock-Up Torque ConverterCombines maximum rimpull and cushioned shifting of torque converter drive with the efficiency and performance of direct drive. Engages at approximately 8 km/h (5 mph), delivering more power to the wheels.
3) Final DrivesCat final drives work as a system with the planetary power shift transmission to deliver maximum power to the ground. Built to withstand the forces of high torque and impact loads, double reduction final drives provide high torque multiplication to further reduce drive train stress.
Wheels and RimsCast rear wheels and Cat center-mount rims are mounted using studs and nuts to minimize maintenance and maximize durability.
Steering SystemHydraulic steering control system is designed for exceptional smoothness and precise control. A separate circuit prevents cross contamination for long life.
Engine/Power Train Integration
Electronically combines critical power train components to work more intelligently and to optimize overall truck performance.
Cat Data LinkElectronically integrates machine computer systems to optimize overall power train performance, increase reliability and component life, and reduce operating costs.
Electronic Technician (Cat ET)Cat ET service tool provides service technicians with easy access to stored diagnostic data through the Cat Data Link to simplify problem diagnosis and increase machine availability.
Integrated Braking Control (IBC)IBC integrates Automatic Retarder Control and Traction Control into one system for optimum performance and efficiency.
Body-up Reverse NeutralizerAutomatically shifts the transmission to neutral if the hoist lever is activated while transmission is shifted in reverse.
Supplemental SteeringSupplemental Steering system uses pressure accumulators and allows up to three 90-degree turns in case of engine failure.
Rugged Cat structures are the backbone of the 785C mining truck’s durability.
Box-Section DesignThe 785C frame uses a box-section design, incorporating two forgings and 21 castings in high stress areas with deep penetrating and continuous wrap-around welds to resist damage from twisting loads without adding extra weight.
ServiceabilityThe open box-section frame design allows easy access to power train components, reducing overall removal and installation time, and lowering overall repair costs. The raised and pinned body allows excellent access to the transmission.
Steel StructuresMild steel used throughout frame provides flexibility, durability and resistance to impact loads, even in cold climates, and allows for easy field repairs.
Integral Four-Post ROPS CabResiliently mounted to the main frame to reduce vibration and sound, the integral ROPS is designed as an extension of the truck frame. The ROPS/FOPS structure provides “five-sided protection” for the operator.
Suspension SystemDesigned to dissipate haul road and loading impacts for longer frame life and a more comfortable ride.
CylindersFour independent self-contained, oil pneumatic, variable-rebound suspension cylinders are designed to absorb shocks in the most severe applications.
Durable DesignRugged cylinders utilize large diameter bore and low-pressure nitrogen/oil design for long life with minimal maintenance.
• FrontFront cylinders with preset caster and camber are mounted to the frame and serve as steering kingpins for a tight turning radius with excellent maneuverability and low maintenance.
• RearRear cylinders allow axle oscillation and absorb bending and twisting stresses caused by uneven and rough haul roads rather than transmitting them to the main frame.
Ergonomically designed for operator comfort, superior control and high productivity.
Enhanced Operator VisibilityThrough the use of the fully Integrated Object Detection System, RADAR AND CAMERA, the operator can receive both audible and visual indications of detected objects.
Ergonomic LayoutThe 785C operator station is ergonomically designed for total machine control in a comfortable, productive and safe environment. All controls, levers switches and gauges are positioned to maximize productivity and minimize operator fatigue.
Quiet CabIntegral, sound-suppressed ROPS/FOPS cab is resiliently mounted to the mainframe to isolate the operator from sound and vibration for a quiet, secure and comfortable ride.
Viewing AreaDesigned for excellent all-around visibility and clear sight lines to the haul road, the large viewing area enables the operator to maneuver with confidence for high productivity. 1) Air Suspension Seat with Three-Point Operator Restraint 2) Hoist Lever 3) Secondary Brake Pedal 4) Monitoring System 5) Steering Column 6) Transmission Console 7) Parking Brake Reset Valve 8) Storage Compartment 9) Trainer Seat 10) Operator Window 11) Operator Controls 12) Heating/Air Conditioning
Radio ReadyThe operator’s station comes ready with power ports, speakers, antenna, and electrical connections to facilitate trouble-free radio installation. Consult your dealer for the complete line of available Cat radio options including satellite radio.
Cat® Brake System
Reliable braking with superior control gives the operator the confidence to focus on productivity.
Integrated Braking SystemThe Cat oil-cooled braking system delivers reliable performance and control in the most extreme haul road conditions. The integrated system combines the service, secondary, parking brake and retarding functions in the same robust system for optimum braking efficiency.
Oil-Cooled Multiple Disc BrakesCat four-wheel, forced oil-cooled, multiple disc service brakes are continuously cooled by water-to-oil heat exchangers for exceptional, non-fade braking and retarding performance.
Extended Life Disc BrakesCat oil-cooled disc brakes are designed with large discs and plates for reliable, adjustment-free operation and performance. Brakes are completely enclosed and sealed to prevent contamination and reduce maintenance. Additionally, this machine features optional extended life friction material that has double the wear life of standard brakes and is twice as resistant to glazing resulting in more consistent braking power with less noise.
PistonsThe Caterpillar two-piston design combines the service, secondary, parking brake and retarding functions in the same system. The primary piston hydraulically actuates both service and retarding functions. The secondary piston is spring-applied and held in the disengaged position by hydraulic pressure. If hydraulic system pressure drops below a specified level, the spring-applied secondary piston automatically applies the brakes.
Parking BrakeOil-cooled, spring-applied, hydraulically released parking brake is applied to all four wheels for superior parking capability on all grades up to 15 percent.
Hydraulic Automatic Retarder Control (HARC)Hydraulically activated automatic retarder control system electronically controls retarding on grade to maintain optimum engine rpm and oil cooling. Additional braking may be applied using the manual retarder or the brake pedal. HARC is deactivated when the operator applies the brakes or accelerator controls.
Truck Body Systems
Caterpillar designed and built for rugged performance and reliability in the toughest mining applications.
Cat Truck BodiesMatching the truck body to the application is a critical part of achieving the best value from your 785C. Caterpillar offers a variety of application specific body options that yield a payload ranging from 131 to 144 metric tons (144 to 158 tons). The Caterpillar exclusive 10/10/20 payload guidelines help achieve a balance of excellent payload with safe operation.
1) Cat “X” BodyThe X body is a heavy duty body configured with a variety of liner options to meet site specific requirements of a mine. Like the Dual Slope - the X body is designed for durability across a range of harsh applications.
2) Mine Specific Body (MSD II)For mature mines with good operational and maintenance practices, the lighter weight MSD II (Mine Specific Design) body is available in several sizes. It is a customer/site specific body that is designed to maximize performance. The MSD II is designed to maximize payload, provide good durability and can be configured with a variety of liner options to meet the specific requirements of the mine.
3) Gateless Coal BodyThis specialized high volume body, available in several sizes, is targeted at dedicated coal haulage applications with minimal impact. The kicked up floor design eliminates the tailgate and gives the volume required to meet target payload.
4) Dual Slope BodyThe original standard body, the Dual Slope body, provides excellent load retention, maintains a low center of gravity with optimum load distribution, reduces shock loading and is available in lined and unlined configurations. The Dual Slope body is intended for tough applications including greenfield sites and contracting mines.
Custom Body OptionsA variety of options including tail extensions, sideboards, tumble bars, rock boxes and rock shedders are available to maintain rated payload, reduce spillage and improve hauling efficiencies.
Vital machine health and payload data keeps the 785C performing at peak production levels.
VIMS® Monitoring SystemIntelligent Caterpillar designed machine monitoring system provides critical machine health and payload data in real-time to keep the 785C performing at top production levels.
Production ManagementProduction Management enhances truck/loading tool effectiveness, improves fleet productivity and helps extend the life of truck frames, tires, rims and power train components, while lowering operating and maintenance cost.
Payload ManagementMax Payload Speed Manager is a feature that aids in managing the Caterpillar 10/10/20 Overload Policy. Based on target payload weight and overload settings, the VIMS system logs and warns the operator when the truck reaches overload after second gear reweigh. The truck will be limited to second gear at 1,750 rpm, and the automatic retarder speed setting is reduced to 1,750 rpm until the load is dumped.
Road Analysis Control (RAC)Optional system monitors haul road conditions by measuring frame rack and pitch to improve haul road maintenance, cycle times, tire life and fuel efficiency.
VIMS-PCVIMS-PC, the off-board reporting software program, allows service personnel to download a complete record of machine health and productivity data to a laptop computer for diagnosis and analysis. Easy-to-use software enables service technicians and mine management to generate health and payload reports for more effective machine management.
VIMS SupervisorOptional software allows mine management to easily manage and interpret VIMS data for optimum fleet management and productivity.
Machine ManagementService technicians or mine personnel can download data and generate reports. Data can be used to improve effectiveness of scheduled maintenance programs, maximize component life, improve machine availability, and lower operating costs.
Gauge ClusterConveniently located gauge cluster maintains a constant display of vital machine functions.
Cat mining machines and system are designed with safety as their first priority.
Product SafetyCaterpillar has been and continues to be proactive in developing mining machines that meet or exceed safety standards. Safety is an integral part of all machine and system designs.
Integrated Object Detection SystemsObject Detection Systems are factory installed as standard equipment on 785C mining trucks. The fully Integrated Object Detection System, RADAR AND CAMERA, provides both audible and visual indications of detected objects. This system uses a combination of short and medium range radars which surround the machine, along with cameras on each side to allow the operator to confirm the detected object. The cameras supplement the radar alerts and are selectable by touch screen menus through an intuitive interface.
Machine Safety FeaturesCaterpillar incorporates safety into every aspect of our machines. Every machine meets or exceeds SAE and ISO standards and has the ROPS integrated into the cab design. An engine shutoff switch and an electrical system cutoff are conveniently located at ground level.
Overload PolicyAdherence to the Caterpillar 10/10/20 Overload Policy assures that steering and braking systems have sufficient capacity to perform.
Standard Safety FeaturesSlip resistant surfaces, retractable, seat/shoulder belts with three-point operator restraint, wide-angle mirrors, body raised indicator, body retaining cable, guard rails, reverse neutralizer when dumping, low interior sound level, secondary steering system.
A variety of features improve sustainability in areas of decreasing waste, extending component life and lowering emissions levels.
Sustainability FeaturesThe 785C Mining Truck offers oil renewal systems, extended life filters and extended maintenance intervals which aid in decreasing the amount of waste contributed to our environment.
Oil Renewal SystemOptional oil renewal system extends engine oil change intervals from 500 hours to 4,000 hours or more to increase machine availability and reduce costs.
Engines with Advanced TechnologyEngines with advanced technology contribute less emissions to the environment while maintaining fuel efficiency.
Advanced Surface Technology (AST)Advanced Surface Technology (AST) is a replacement for hard chrome coatings on some steel parts, including suspension and hoist cylinder rods. This technology improves wear resistance and reduces repair time. Chrome has been eliminated to reduce environmental impact.
Fuel EfficiencyThe engine provides additional retarding by running against compression on downhill hauls. During retarding applications the engine ECM does not inject fuel into the cylinders for exceptional fuel economy.
Less time spent on maintenance means more time on the haul roads.
Servicing EaseEasy access to daily service points simplifies servicing and reduces time spent on regular maintenance procedures. Enhanced serviceability and 500-hour service intervals are designed to increase machine availability and productivity.
Maintenance PlatformProvides access to engine, air filters, steering hydraulic tank and battery compartment.
In-Frame AccessPermits easy access to major components for easy servicing and removal.
Ground-Level AccessAllows convenient servicing to tanks, filters, drains, and engine shutdown. Ground-level VIMS data port permits easier downloading of information.
AutolubeAutomatic lubrication system reduces maintenance time by automatically lubricating necessary components on a regular basis.
Fast Fill Service CenterOptional fast fill service center features high-speed fuel and oil exchange.
Scheduled Oil SamplingS·O·SSM sampling valves speed sampling and analysis reliability.
Pressure Test PointsDisconnect valves are conveniently located throughout the hydraulic systems for easy pressure testing.
Sealed Electrical ConnectorsElectrical connectors are sealed to lock out dust and moisture. Harnesses are braided for protection. Wires are color coded for easy diagnosis and repair.
Cylinder HeadsIndividual cylinder heads are interchangeable for easy removal and visual inspection of internal parts.
On-Board Diagnostic SystemsThe VIMS monitoring system continuously monitors all critical machine functions and components to help locate faults quickly for faster repair. Electronic Control Systems provide diagnosis of engine, transmission, brake and chassis systems. Service Technicians utilize the Electronic Technician service tool (Cat ET) to program and troubleshoot these systems.
Cat dealers have what it takes to keep mining trucks productive.
Commitment Makes the DifferenceCat dealers offer a wide range of solutions, services and products that help you lower costs, enhance productivity and manage your operation more efficiently. Support goes far beyond parts and service. From the time you select a piece of Cat equipment until the day you rebuild, trade or sell it, the support you get from your Cat dealer makes the difference that counts.
Dealer CapabilityCat dealers will provide the level of support you need, on a global scale. Dealer expert technicians have the knowledge, experience, training and tooling necessary to handle your repair and maintenance needs, when and where you need them.
Product Support and Service SupportSupported by a worldwide network of parts distribution facilities, dealer service centers and technical training facilities, Cat dealers can maximize your uptime. With a tailored service plan, your dealer can help you get the most return on your investment.
TrainingYour Cat dealer can arrange training programs to help operators improve productivity, decrease downtime, reduce operating costs, enhance safety, and improve return on the investment you make in Cat products.
Technology ProductsCat dealers offer a range of advanced technology products such as VIMS monitoring system and MineStar™ information management system. These products include radio data communications, machine monitoring and diagnostics, fleet management, and haul road maintenance software - all designed to improve fleet efficiency, increase productivity, and lower costs.
www.cat.comFor more complete information on Cat products, dealer services, and industry solutions, visit us on the web at www.cat.com.