785D Mining Truck / Haul Truck

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Nominal Rated Payload154 ton (US) (140 t)
Rated Gross Machine Weight550000 lb (249476 kg)
Gross Power - SAE J19951450 HP (1082 kW)
Engine ModelCat® 3512C HD
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.


Nominal Rated Payload154 ton (US) (140 t)
Rated Gross Machine Weight550000 lb (249476 kg)
Gross Power - SAE J19951450 HP (1082 kW)
Engine ModelCat® 3512C HD
Net Power - SAE J13491348 HP (1005 kW)
Body Weight - MSD46738 lb (21200 kg)
Front Axle - Empty*45-46%
Body Weight55468 lb (25160 kg)
Body Weight49150 lb (22295 kg)
Heaped (SAE 2:1)111 yd³ (85 m³)
Heaped (SAE 2:1)102 yd³ (78 m³)
Rear Axle - Empty*54-55%
Front Axle - Loaded - Target33 % (33 %)
Bore6.7 in (170 mm)
Rear Axle - Loaded - Target67 % (67 %)
Stroke8.4 in (215 mm)
Rear Axle - Loaded*Depends on body configuration.
Displacement3573.6 in³ (58.56 l)
Rear Axle - Empty*Depends on body configuration.
Forward - 17.5 mile/h (12.1 km/h)
Forward - 210.2 mile/h (16.3 km/h)
Forward - 313.8 mile/h (22.2 km/h)
Forward - 418.6 mile/h (29.9 km/h)
Forward - 525.2 mile/h (40.6 km/h)
Forward - 634 mile/h (54.8 km/h)
Reverse6.8 mile/h (11 km/h)
Differential Ratio2.10:1
Planetary Ratio10.83:1
Total Reduction Ratio22.75:1
Effective Cylinder Stroke - Front12.1 in (306.5 mm)
Effective Cylinder Stroke - Rear6.5 in (165 mm)
Brake Surface - Front9497 in² (61270 cm²)
Brake Surface - Rear13908 in² (89729 cm²)
StandardsSAE J1473 OCT90 ISO 3450-1985
Pump Flow - High Idle198 gal/min (750 l/min)
Relief Valve Setting - Raise2500 psi (17238 kPa)
Body Raise Time - High Idle15.2 s (15.2 s)
Body Lower Time - High Idle15.9 s (15.9 s)
Body Lower Time - Float16.2 s (16.2 s)
Body Power Down - High Idle15.9 s (15.9 s)
Fuel Tank - Standard500 gal (US) (1893 l)
Cooling System100 gal (US) (379 l)
Crankcase54 gal (US) (204 l)
Differential - Final Drives115 gal (US) (436 l)
Steering Tank24 gal (US) (90 l)
Steering System - Including Tank31 gal (US) (117 l)
Brake/Hoist Hydraulic Tank89 gal (US) (337 l)
Sound StandardsANSI/SAE J1166 MAY90 SAE J88 APR95
Chassis Weight183270 lb (83130 kg)
ROPS StandardsSAE J1040 APR88 ISO 3471:1994
Brake Hoist System - Includes Tank169 gal (US) (641 l)
Steer Angle36 ° (36 °)
Turning Diameter - Front97.7 ft (29.8 m)
NoteWeight distributions optimized with Cat body.
Top Speed - Loaded34 mile/h (54.8 km/h)
Torque Converter/Transmission System - Including Sump65.51 gal (US) (248 l)
Steering StandardsSAE J1511 OCT90 ISO 5010:1992
Standard Tires33.00-R51 (E3 & E4)

Benefits and Features

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.


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.

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.


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 allow 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

Standard Equipment

  • Alarm, Back-up
  • Alternator (105 A)
  • Batteries, 93Ah, Low-maintenance, 12V (2)
  • Converter, 12V electrical
  • Electrical System, 24V, 15A
  • Lighting System
  • Air Conditioner
  • Ashtray/cigarette lighter
  • Coat hook
  • Diagnostic connection port
  • Dome courtesy light
  • Entertainment radio ready
  • Gauges/Indicators
  • Heater/defroster
  • Horn
  • Hoist body control, electric
  • Integrated Object Detection System
  • ROPS cab insulated/sound suppressed
  • Storage compartment
  • Seatbelt, 75 mm (3 in), retractable
  • Steering wheel, tilt, padded, telescopic
  • Sun visor
  • Tinted glass
  • Window, electric powered, operator
  • Windshield wiper, intermittent control and washer
  • Cat 3512C HD-EUI diesel engine
  • Braking System
  • Transmission
  • Air Line Dryer (2)
  • Body Mounting Group
  • Auto lubrication system (Lincoln)
  • Dumping, Auxiliary Quick Connect for “Buddy Dumping”
  • Steering, Auxiliary Quick Connect for Towing
  • Continuous rear axle filtration
  • Diagonal stairway, 600 mm (24 in)
  • Driveline Operator Safety Guard
  • Fast-fill Fuel System
  • VIMS Dataport
  • Battery Disconnect
  • High speed crankcase oil change
  • Reservoirs (Separate)
  • S•O•S℠ sample ports
  • Supplemental steering (automatic)
  • Tie Down Eyes
  • Tow Hooks, Front
  • Traction Control System
  • Vandalism Protection Locks
  • Vital Information Management System (VIMS) includes: VIMSpayload monitor, MAX payload and speed manager

Optional Equipment

  • Body, X
  • MSD II (Mine Specific Design)
  • Dual Slope
  • Custom Body Options
  • Tail
  • Wrap around
  • Full-length liner
  • Tail extension wrap-around
  • Footrest, operator
  • Hose, cab clean-out
  • Vacuum, cab clean-out
  • Pre-lube, engine
  • Oil renewal system
  • Oil cooler, rear axle
  • Starting, Cold Weather
  • Spare rims
  • Control, Road Analysis (RAC)
  • Service Center, Wiggins
  • Fire extinguisher, portable
  • Hub Odometer, Kilometers
  • Hub Odometer, Miles
  • Wheel Chocks
  • Heater, Diesel fuel