 |  | Power Train - Engine
The Cat 3512C engine delivers the power and reliability necessary to perform in the most demanding applications. Designed for efficient operation, the 3512C offers precise speed control, faster cold starting, reduced smoke (under all operating conditions), and electronic engine protection. |
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 | | Design
The 3512B is a 12-cylinder, four-stroke design that uses long, effective power strokes for more complete fuel combustion and optimum fuel efficiency. |
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EPA Compliant
The 3512C HD engine meets U.S. Environmental Protection Agency Tier 2 emissions standards. |
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Altitude Compensation
Designed for maximum operating efficiencies at altitudes under 3048 m (10,000 ft). |
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High Torque Rise
The 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. |
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Enhanced Life
High displacement, low rpm rating and conservative horsepower ratings mean more time on the haul roads and less time in the shop. |
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Oil Renewal System
Optional oil renewal system extends engine oil change intervals from 500 hours to 4,000 hours or more to increase machine availability and reduce costs. |
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Engine Protection
Computerized system electronically protects the engine during cold starts, high altitude operation, air filter plugging, and high exhaust temperature. |
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Fuel Efficiency
The 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. |
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Articulated Two Piece Piston Design
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Optional Engine Pre-Lubrication
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 | | Power Train - Transmission
The Cat six-speed planetary power shift transmission and mechanical drive power train, matched with the direct injection 3512C HD cylinder engine, provides consistent power and efficiency for peak power train performance. |
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Mechanical Power Train
The 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. |
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1) Transmission
The Cat six-speed planetary power shift transmission is matched with the direct-injection 3512C diesel engine to deliver constant power over a wide range of operating speeds. |
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Robust Design
Designed for the higher horsepower of the 3512C HD diesel engine, the proven planetary power shift transmission is built tough for long life between overhauls. |
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Long Life
A dedicated oil tank and circuit provides cooler, cleaner oil for maximum performance and longer component life. |
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Transmission Chassis Control (TCC)
Transmission/Chassis Control (TCC) module communicates over the CAT Data Link with the engine ECM to manage engine speed during shifts for increased clutch life and operator comfort. When the transmission is in sixth gear, the engine is allowed to run out to 2000 rpm, so the truck can achieve speeds up to 55 km/h (34 mph). The shift points are set at the factory for optimal performance, efficiency and component life.
- TCC monitors and records key operating conditions and parameters for later downloading and diagnostic troubleshooting by service personnel.
The integrated system features:
- Programmable top gear limit
- Control throttle shifting
- Directional shift management
- Neutral coast inhibitor
- Economy shift mode
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2) Lock-Up Torque Converter
Lock-up Torque Converter combines the maximum rimpull and cushioned shifting of torque converter drive with the efficiency and performance of direct drive. The lock-up clutch engages at approximately 8 km/h (5 mph). During shifts the lock-up clutch quickly releases and re-engages to reduce power train torque loads. This action provides for smoother shifting, extended component life, and increased operator comfort.
• Rimpull at stall is 840.6 kN (189,127 lb) - 32 percent gradeability at maximum operating weight. |
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Lock-Up Clutch
Quickly releases and re-engages to reduce power train torque loads for smoother shifting, long life and a more comfortable ride. |
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Smooth Shifting
Individual clutch modulation provides smooth clutch engagements to optimize performance and extend clutch life. |
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3) Final Drives
Cat 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. |
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Wheels and Rims
Cast rear wheels and Cat center-mount rims are mounted using studs and nuts to minimize maintenance and maximize durability. |
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Rear Axle Filtration
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 | | Engine/Power Train Integration
The Cat Data Link electronically combines engine, transmission, brake and operational information to optimize overall truck performance. Stored diagnostic data can be accessed via the Cat Electronic Technician (Cat ET) to improve troubleshooting and reduce downtime. |
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Cat Data Link
Electronically integrates machine computer systems to optimize overall power train performance, increase reliability and component life, and reduce operating costs. |
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Controlled Throttle Shifting
Regulates engine rpm during shifting to reduce power train stress and clutch wear by controlling engine speed, torque converter lock-up and transmission clutch engagement for smoother shifts and longer component life. |
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Directional Shift Management
Regulates engine speed during directional shifts to prevent damage caused by high-speed directional changes. |
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Neutral Coast Inhibitor
Prevents transmission from shifting to neutral at speeds above 6.5 km/h (4 mph) to protect the transmission from operating with insufficient lubrication. |
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Body-up Reverse Neutralizer
Automatically shifts the transmission to neutral if the hoist lever is activated while transmission is shifted in reverse. |
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Body-up Shift Inhibitor
Prevents the transmission from shifting above a pre-programmed gear without the body fully lowered. |
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Overspeed Protection
The transmission control electronically senses engine conditions and automatically up-shifts one gear to prevent overspeeding. If overspeeding occurs in top gear, the lock-up clutch is disengaged. |
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Programmable Top Gear
Transmission top gear maximum can be set using the Cat ET service tool to help the operator maintain speed limits. |
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Anti-Hunt Function
Minimizes shifting by not allowing the transmission to up or down shift immediately after a shift has occurred. This prevents transmission shifting for increased component life. |
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Downshift Inhibitor
Prevents engine overspeeding by keeping the transmission from downshifting until engine speed reaches the downshift point. |
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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. |
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Diagnostic Capability
Critical data from the electronic engine and transmission controls, including transmission shifting, engine speed and fuel consumption, provides service technicians with enhanced diagnostic capability to reduce downtime and operating costs. |
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Integrated Braking Control (IBC)
IBC integrates Automatic Retarder Control and Traction Control into one system for optimum performance and efficiency. |
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 | | Structures/Suspension/Steering
Caterpillar® truck frames are built to optimize torsional load displacement. Mild steel provides flexibility, durability and resistance to impact loads. Castings and forgings in high stress areas provide exceptional strength and durability for long life. |
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Box-Section Design
The 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. |
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Steel Structures
Mild steel used throughout frame provides flexibility, durability and resistance to impact loads, even in cold climates, and allows for easy field repairs. |
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Castings
Castings have large radii with internal reinforcing ribs to dissipate stress in areas of high stress concentration. Castings move welds to lower stress areas for greater frame life. |
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Serviceability
The 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. |
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 | | Integral Four-Post ROPS Cab
Resiliently 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. |
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Suspension System
Designed to dissipate haul road and loading impacts for longer frame life and a more comfortable ride. |
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Cylinders
Four independent self-contained, oil pneumatic, variable-rebound suspension cylinders are designed to absorb shocks in the most severe applications. |
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Durable Design
Rugged cylinders utilize large diameter bore and low-pressure nitrogen/oil design for long life with minimal maintenance. |
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• Front
Front 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. |
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• Rear
Rear 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. |
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Steering System
Hydraulic steering control system is designed for exceptional smoothness and precise control. A separate circuit prevents cross contamination for long life. |
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Supplemental Steering
Supplemental steering system uses pressure accumulators and allows up to three 90-degree turns in case of engine failure. |
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 | | Operator's Station
The ergonomic cab is designed for operator comfort and ease of operation to allow the operator to focus on production. Controls and gauges are positioned within easy reach for optimum efficiency and superior control. |
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 | | Ergonomic Layout
The 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. |
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Quiet Cab
Integral, 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. |
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 | | Viewing Area
Designed 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. |
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Ergonomically designed, fully adjustable air suspension seat with adjustable armrests provides optimal driving comfort. A wide, retractable three-point seat/shoulder belt provides a secure, comfortable restraint. |
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Radio Ready
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Four-position, low effort electronic hoist control system with fingertip control is mounted next to the operator's seat for ease of operation. |
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Conveniently located on the floor for easy operator control. |
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The VIMS monitoring system features an easy-to-read display and easy-to-use operator input keypad for precise machine status information. |
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Comfort wheel with tilt and telescoping steering features provide a comfortable driving position. |
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Ergonomic gearshift lever with backlit gear indicators optimize efficiency. |
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When air system is drained, it will not allow the parking brake to be released until the valve has been reset. |
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Large storage compartment is located under the trainer seat for a safe, uncluttered working environment. |
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Full-size, fully padded trainer seat features a backrest, wide hip and shoulder room, and seat belt for secure travel. Air-suspension, optional. |
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Powered operator window and sliding trainer seat window offer simple operation and an unobstructed view. |
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Easy to reach turn signal, high beam, intermittent windshield wiper and windshield washer controls are designed for optimum efficiency and comfort. |
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Efficient design provides fresh, pressurized, temperature-controlled air circulation for a comfortable working environment in any climate. |
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Cab is prewired with power converter, speakers, wiring harness, antenna and provision for add-on communication systems. |
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 | | Caterpillar Brake System
Cat oil-cooled, multiple disc brakes offer exceptional, fade-resistant braking and retarding for maximum performance and productivity in all haul road conditions. Integrated Braking Control combines retarding and traction control into one system for optimum braking efficiency. |
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 | | Integrated Braking System
The 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. |
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 | | Four Corner Retarding
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Oil-Cooled Multiple Disc Brakes
Caterpillar 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. |
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 | | Extended Life Disc Brakes
Extended life friction material has double the wear life of standard brakes and is twice as resistant to glazing for more consistent braking power with less noise. |
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 | | Pistons
Caterpillar's patented, two-piston design combines the service, secondary, parking brake and retarding functions in the same robust system.
- The primary piston is hydraulically actuated and provides both service and retarding functions.
- The secondary piston is spring-applied and is held in the disengaged position by hydraulic pressure.
- The brake system is designed so that, in the event hydraulic system pressure drops below a specified level, the spring-applied secondary piston automatically applies the brakes.
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 | | Parking Brake
The superior parking brake function on this truck is provided by the oil-cooled, spring-applied, hydraulically-released service brakes at all four wheels. This reliable and durable parking brake will hold a truck carrying a rated load on any grade up to 15 percecnt |
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 | | Truck Body Systems
A variety of Caterpillar designed and built truck bodies ensure optimal performance and reliability in tough mining applications. Cat dealers can help build an optimum hauling system to maximize truck payloads and extend body and truck wear life. |
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 | | Cat Truck Bodies
Matching the truck body to the application is a critical part of achieving the best value from your 785. Caterpillar offers five body choices to achieve the best match.
- Dual-Slope Body
- Mine Specific Design (MSD II)Body
- Gateless Coal Body
- Caterpillar "X" Body
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Body Selection
Selection of the proper body depends on material and haul road conditions. The better the match of body to application, the greater the efficiency. Your Cat dealer can help you select the right body system for your site specific applications. |
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 | | Body Options
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 | | Custom Body Options
Tail extensions, sideboards, tumblebars, rock boxes and rock shedders are available to maintain rated payload, reduce spillage, and improve hauling efficiencies.
- Sideboards are designed to maximize or attain gross machine weight.
- Tail extensions are used to help retain the rear portion of the pile and limit load spillage on haul roads, extending tire life.
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 | | Monitoring System
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 | | VIMS Monitoring System
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 | | Data Access
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 | | Gauge Cluster
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 | | Safety
Caterpillar sets the standard when it comes to safety in the design and manufacturing of heavy equipment for the mining industry. Safety is not an afterthought at Caterpillar, but an integral part of all machine and systems designs. |
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 | | Product Safety
Caterpillar 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 systems designs. |
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Machine Safety Features
The 785D is designed to many national and international standards. |
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Overload Policy
Safety is integral to maintaining the highest productivity in mining machine operation. The Caterpillar 10/10/20 Overload Policy assures that steering and braking systems have sufficient capacity to perform, even at 20 percent overload. |
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SAFETY.CAT.COM
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 | | Serviceability
The 785D is designed for quick and easy servicing. Simplified service and maintenance features reduce downtime, allowing the machine to spend less time being serviced and more time on the haul roads. |
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Servicing Ease
Easy 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. |
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Maintenance Platform
Provides access to engine, air filters, steering hydraulic tank and battery compartment. |
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In-Frame Access
Permits easy access to major components for easy servicing and removal. |
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Ground-Level Access
Allows convenient servicing to tanks, filters, drains, and engine shutdown. Ground-level VIMS data port permits easier downloading of information. |
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Autolube
Automatic lubrication system reduces maintenance time by automatically lubricating necessary components on a regular basis. |
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Fast Fill Service Center
Optional Wiggins fast fill service center features high-speed fuel and oil exchange. |
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Pressure Test Points and SOSSM ports
Disconnect valves are conveniently located throughout the hydraulic systems for easy pressure testing. |
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Air Filters
Radial seal air filters are easy to change, reducing time required for air filter maintenance. |
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Sealed Electrical Connectors
Electrical connectors are sealed to lock out dust and moisture. Harnesses are braided for protection. Wires are color coded for easy diagnosis and repair. |
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Oil Renewal System (ORS)
Optional on-board engine oil management system is designed to increase availability and productivity by extending oil change intervals and reduce oil disposal labor and costs. ORS meters and injects used engine oil from the crankcase into the engine's fuel return line. New oil is manually added as a part of daily maintenance. |
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Fast Fill Fuel
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 | | Customer Support
Caterpillar dealers provide unmatched product support, anywhere in the world. With industry-best parts availability and a wide range of maintenance and service options, Cat dealers have what it takes to keep your mining machines productive. |
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Commitment Makes the Difference
Cat 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. |
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Dealer Capability
Dealer branch facilities, trained technicians, field service trucks, and operator training programs provide customers with complete customer support on a global scale. |
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Product Support and Service Support
Cat dealers believe superior products deserve superior support. Cat customers rely on prompt, dependable parts availability and expertise through our global dealer network – ready to meet your needs 24/7. |
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Training
Improving operating techniques can boost your profits. Your Cat dealer has training videotapes, literature and other ideas to help you increase productivity. |
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Technology Products
Cat 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. |
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