Cat 785D

Mining Trucks

About the Cat 785D


The 785D Mining Truck is engineered for performance, designed for comfort, and built to last. Developed specifically for high production mining and construction applications, the 785D Mining Truck keeps material moving at high volume to lower your cost-per-ton. Rugged construction creates a durable machine. Easy maintenance procedures ensure high reliability and  long life with low operating costs.


Gross Power - SAE J1995 1082 kW
Net Power - SAE J1349 1005 kW
Engine Model Cat® 3512C HD
Bore 170 mm
Stroke 215 mm
Displacement 58.56 l
Weights - Approximate
Rated Gross Machine Weight 249476 kg
Body Weight - MSD 21200 kg
Chassis Weight 83130 kg
Nominal Rated Payload 140 t
Forward - 1 12.1 km/h
Forward - 2 16.3 km/h
Forward - 3 22.2 km/h
Forward - 4 29.9 km/h
Forward - 5 40.6 km/h
Forward - 6 54.8 km/h
Reverse 11 km/h
Top Speed - Loaded 54.8 km/h
Final Drives
Differential Ratio 2.10:1
Planetary Ratio 10.83:1
Total Reduction Ratio 22.75:1
Effective Cylinder Stroke - Front 306.5 mm
Effective Cylinder Stroke - Rear 165 mm
Brake Surface - Front 61270 cm²
Brake Surface - Rear 89729 cm²
Standards SAE J1473 OCT90 ISO 3450-1985
Body Hoists
Pump Flow - High Idle 750 l/min
Relief Valve Setting - Raise 17238 kPa
Body Raise Time - High Idle 15.2 s
Body Lower Time - High Idle 15.9 s
Body Lower Time - Float 16.2 s
Body Power Down - High Idle 15.9 s
Body - Dual Slope
Body Weight 22295 kg
Heaped (SAE 2:1) 78 m³
Body - X
Body Weight 25160 kg
Heaped (SAE 2:1) 85 m³
Turning Diameter - Front 29.8 m
Steer Angle 36 °
Steering Standards SAE J1511 OCT90 ISO 5010:1992
Weight Distributions - Approximate
Front Axle - Empty* 45-46%
Rear Axle - Empty* 54-55%
Front Axle - Loaded - Target 33 %
Rear Axle - Loaded - Target 67 %
Rear Axle - Loaded *Depends on body configuration.
Rear Axle - Empty *Depends on body configuration.
Note Weight distributions optimized with Cat body.
Service Refill Capacities
Fuel Tank - Standard 1893 l
Cooling System 379 l
Crankcase 204 l
Differential - Final Drives 436 l
Steering Tank 90 l
Steering System - Including Tank 117 l
Brake/Hoist Hydraulic Tank 337 l
Brake Hoist System - Includes Tank 641 l
Torque Converter/Transmission System - Including Sump 248 l
ROPS Standards SAE J1040 APR88 ISO 3471:1994
Sound Standards ANSI/SAE J1166 MAY90 SAE J88 APR95
Standard Tires 33.00-R51 (E3 & E4)



Standard Safety Features
Slip 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, ground level access shutoff switches.

Access and Egress
Improvements for machine level access and egress include a standard 600 mm (24 in) diagonal stairway across the front of the machine. Improvements for ground level access include an optional powered access stairway.

Integrated Object Detection Systems
Object Detection Systems are factory installed as standard equipment on 785D 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.


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.

The Cat 6-speed planetary power shift transmission is matched with the direct-injection 3512C engine to deliver constant power over a wide range of operating speeds and is built tough for long life between overhauls.

Like all Cat mechanical-drive trucks, the 785D features four-corner oil-cooled brakes and Automatic Retarding Control to improve handling and machine control so operators can work quickly and confidently.

Fully integrated AHS factory offering:
— 240+ autonomous trucks in service
— Over 1.6 billion tonnes hauled
— Near continuous utilization


The individual components, software, systems and engine that go inside a Cat truck have different purposes, but they have one very important thing in common: They are all manufactured by Caterpillar and supported by the Cat dealer network.

This integration ensures that the entire truck — from body to bumper, engine to electronics — can be fully optimized to deliver the lowest cost per ton.

No one knows more about how to get the most from a piece of Cat equipment than your local Cat dealer. This one-of-a-kind, on-the-ground support network delivers expert service, integrated solutions, after-sales support, fast and efficient parts fulfilment, world-class rebuild and remanufacturing capabilities, and more.

Cat dealers operate as nearly 200 local businesses — each one fully embedded in and committed to the geographic area it serves. That means you work with people you know, who know your business, and who respond on your timeframe.


Governments and regulatory agencies mandate that you establish and follow environmentally sound policies and practices as you meet the demand for mined materials. We’re focused on doing our part to make sure our trucks help you meet those regulations.

We've designed our trucks to use less fuel, which reduces engine emissions and carbon footprint, and there is zero fuel burn during retarding.
—The optional Tier 4 Final engine reduces NOx and particulate matter. Rear axle filtration, extended life filters and extended maintenance intervals decrease the amount of waste contributed to the environment.

We also continue to research alternative energy sources such as biofuels (B20) and a liquefied natural gas-supplied Dynamic Gas Blending solutions to find new ways to reduce emissions. In addition, we preserve raw materials, conserve energy and reduce emissions through the Cat Reman program, which returns end-of-life components to like-new condition.

The 785D Mining Truck offers oil renewal systems, continuous rear axle filtration, extended life filters and extended maintenance intervals which aid in decreasing the amount of waste contributed to our environment.
— 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.
— 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.

Cat trucks are designed to last over 100,000 hours, and many are going well beyond that. The frame, powertrain, engine and components are built to be rebuilt — using new, remanufactured or rebuilt parts and components — so you can take advantage of multiple lives of like-new performance at a fraction-of-new price.

Operating Cost

The Caterpillar designed machine monitoring system provides critical machine health and payload information to the operator and service personnel. Max 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.

Lock-Up Torque Converter Combines 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.

Transmission Chassis Control (TCC) TCC uses electronically transferred engine rpm data to execute shifts at preset points for optimum performance, efficiency and clutch life.

Technology Solutions

Cat® MineStar™ Solutions
Whether you want to address a single challenge or make step changes in the overall safety, efficiency and productivity of your surface operation, Cat® MineStar™ has a solution for you. MineStar is the mining industry's most comprehensive and thoroughly integrated suite of technology offerings.

Cat Fleet helps you identify opportunities to improve truck efficiency in ways that reduce costs, boost productivity and add real value to your bottom line.
— Eliminate Queuing
— Optimize Shift Changes
— Reduce Fuel Stops

This autonomous hauling solution helps improve productivity, efficiency and profitability while reducing overall costs.

What if your trucks could respond to calls to the shovel, move into position, haul to dump points and even report for maintenance — all without an operator on board? That's what Cat Command for hauling enables.

But this autonomous Cat MineStar solution is more than just an operator-free system. It takes advantage of the most sophisticated technologies available to deliver a next-generation haulage solution — one that boosts safety, productivity and availability on busy mine sites, especially those in difficult or remote locations. With autonomous hauling, the future is here — and we're there to help you bring it to your operation.

With the MineStar Detect proximity detection system, you can equip your 785D with cameras to give your operators a better view of what's happening around their equipment — or combine cameras and radar into a true object detection system that automatically alerts operators to hazards.

You can even add satellite capabilities to provide proximity warnings and avoidance zones, seat-belt monitoring that encourages operators to buckle up, and in-cab systems that intervene when they detect fatigue or distraction.

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.

Truck Body Systems

When it comes to truck bodies, one size does not fit all. And when it comes to your Cat truck, Cat bodies are the best choice. We follow a dynamic approach to engineering — treating the body as part of a system rather than a static structure. Cat bodies are designed to be an integral part of the entire vehicle system, ensuring you achieve maximum chassis life.
— They're sized to meet payload requirements without compromise to vehicle balance, braking or control.
— From the design to the materials, manufacturing to shipping, the entire process meets Cat standards of quality and control.
— The Caterpillar exclusive 10/10/20 payload guidelines help achieve a balance of excellent payload with safe operation.

1 - X Body
The 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 - MSD II
The MSD II bodies are intended for established mines and are customized to suit your specific mining applications based on a mine site evaluation.
—The MSD II is the best lightweight body ever built for mining applications and achieves excellent payload performance.

3 - Gateless Coal Body
The Gateless Coal Body is intended for dedicated coal haulage applications. It can be loaded to achieve target payload across the full range of coal densities.
— The body is designed and built using the MSD II Body concept, ensuring superior durability and reliability.

4 - Dual Slope Body
The original standard body, the Dual Slope body, provides excellent load retention, maintains alow 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.

A 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.


— 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.
— Maintenance Platform provides access to engine, air filters, steering hydraulic tank and battery compartment.
— In-Frame Access permits easy access to major components for easy servicing and removal.
— Ground-Level Access allows convenient servicing to tanks, filters, drains, and engine shutdown.
— Autolube: Automatic lubrication system reduces maintenance time by automatically lubricating necessary components on a regular basis.
— FastFill Service Center: optional service center reduces daily maintenance times with clustered fast fill connections for steering oil, transmission oil, engine oil and coolant.
— Pressure Test Points and S•O•S℠ Ports
— Sealed Electrical Connectors: Electrical connectors are sealed to lock out dust and moisture. Harnesses are braided for protection.
— Fast Fill Fuel provides a receiver at the fuel tank
— Easy-to-change air filters

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