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Off-Highway Trucks(Non Current)

Caterpillar builds Off-Highway Trucks specifically for work in mines, construction and quarries. Our Off-Highway Trucks are pass-matched with Cat Wheel Loaders and Hydraulic Excavators to speed cycle times and maximize productivity.

773D Off-Highway Truck

The 773D Off-highway Truck is engineered for performance, designed for comfort and built to last. Time proven iron and modern technology combine to provide a highly productive, durable, reliable off-highway truck focused on our customer's greatest need...lowest cost-per-ton.

  • Specification Summary

  • Nominal Payload Class (100%)48.9 tonnes
  • Top Speed – Loaded66 km/h
  • Body Capacity - Struck26 m3
  • Maximum Capacity48.9 tonnes
  • Circle Clearance Diameter24 m

Product Details

Operating Specifications

Nominal Payload Class (100%) 48.9 tonnes
Top Speed – Loaded 66 km/h
Body Capacity - Struck 26 m3
Maximum Capacity 48.9 tonnes
Circle Clearance Diameter 24 m
Body Capacity – SAE 2:1 34.1 m3
Raise Time 9.5 Seconds
Lower Time 12.5 Seconds


Engine Model Cat 3412E TA-HEUI
Gross Power – SAE J1995 485 kW
Net Power – SAE J1349 48.7 kW
Net Power - Cat 485 kW
Flywheel Power 485 kW
Net Power – 80/1269/EEC 26 kW
Net Power – ISO 9249 66 kW
Displacement 27 L

Weights – Approximate

Operating Weight - Empty 40188 kg
Operating Weight - Loaded 92530 kg

Weight Distributions – Approximate

Front Axle – Empty 47.3 %
Front Axle – Loaded 33.3 %
Rear Axle – Empty 52.7 %
Rear Axle – Loaded 66.7 %


Forward 1 10 km/h
Forward 2 13.8 km/h
Forward 3 18.7 km/h
Forward 4 25.1 km/h
Forward 5 34 km/h
Forward 6 45.9 km/h
Forward 7 65.8 km/h
Reverse 12 km/h

Final Drives

Planetary Ratio Planetary

Service Refill Capacities

Fuel Tank 700 L
Cooling System 151 L
Steering Tank 55 L
Steering System (Includes Tank) 81 L
Torque Converter / Brake / Hoist Hydraulic Tank 220 L
Brake / Hoist System (Includes Tank) 393 L
Torque Converter / Transmission System (Includes Sump) 100 L

Body Hoists

Pump Flow – High Idle 562 L/min
Relief Valve Setting – Raise 17225 kPa
Body Raise Time – High Idle 9.5 Seconds
Body Lower Time – Float 12.5 Seconds


Inside Body Length 6493 mm
Overall Length 9690 mm
Wheelbase 4191 mm
Ground Clearance 591 mm
Loading Height – Empty 3787 mm
Overall Height – Body Raised 8815 mm
Operating Width 3910 mm
Centerline Front Tire Width 3275 mm
Front Canopy Height 4424 mm


Standard Tire 24.00R35 (E-4)

Power Train

The Caterpillar power train gets the job done smoothly and quickly.

Torque Converter

The lock-up torque converter combines the maximum rimpull and cushioned shifting of torque converter drive with the efficiency and performance of direct drive.

Power Shift Transmission

The seven-speed, planetary power shift transmission utilizes pressure valve to regulate clutch pressure rise and fall to ease clutch engagement. This reduces shock loads on power train components.

Final Drives

Final drives and differential torque multiplication of 17.48:1 further reduces stress on the drive train.

Transmission and Torque Converter Sump

Transmission and torque converter share a common sump. The combined sump offers an easily accessible fill tube and sight gauges.


Full floating axles are shot peened to relieve internal stresses and increase durability. Rolled splines also provide increased service life.

Rear Wheels and Rims

Cat rear wheels and Cat center-mount rims are mounted using studs and nuts to minimize maintenance and maximize durability.

Transmission Chassis Controller (TCC)

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

Power Train Integration

Caterpillar's power train integration provides increased component life and operator comfort.


The twelve-cylinder, turbocharged and aftercooled engine is built for power, reliability, economy and with the HEUI fuel system, meets all worldwide emission standards.

Diesel Engine

The Cat 3412E Diesel Engine is a four-stroke design that uses long, effective power strokes for more complete fuel combustion and optimum efficiency.

Torque Rise

The torque rise provides high lugging force during acceleration on grade or in high rimpull conditions.

Hydraulic Electronic Unit Injector (HEUI)

The Hydraulic Electric Unit Injector (HEUI) is a proven high-pressure, direct injection fuel system. This system electronically monitors operator and machine inputs to optimize engine performance.

Electronic Control Module (ECM)

The Electronic Control Module monitors key functions and logs critical indicators.

Engine/Power Train Integration

Combining the electronic Engine Control Module (ECM) with the Caterpillar Transmission Chassis Controller (TCC) allows critical power train components to work more intelligently.

Cat Data Link

The CAT Data Link electronically integrates the machine's computer systems, which allows communications.

Electronic Technician (ET)

Electronic Technician (ET) enhances diagnostics/serviceability. The electronic engine and transmission controls provide exhaustive diagnostic capability for service technicians.

Caterpillar Electronic Monitoring System (CEMS)

Caterpillar Electronic Monitoring System (CEMS) allows the operator to view requested information and utilizes a three-category warning system to alert operator to abnormal machine conditions.

Optional Attachments

Caterpillar offers optional attachments that integrate with the CAT Data Link System.

Oil-cooled Rear Brakes

Reliable braking lets the operator concentrate on the haul road.

Disc Brakes

Caterpillar forced oil-cooled, multiple disc brakes are continuously cooled for exceptional, fade-resistant braking and retarding.

Oil-cooled Disc Brakes

Oil-cooled disc brakes are designed and built for reliable, adjustment-free operation providing superior performance and service life in comparison to shoe-type and dry-disc system.

Oil Film

An oil film prevents direct contact between the discs. Absorbing the braking forces by shearing oil and carrying heat away, this design extends brake life.


A Caterpillar patented, two-piston design combines the service, secondary, parking brake and retarding functions.

Cat Retarding System

When retarding, the engine runs against compression on downhill hauls, resulting in minimal fuel burn.


The backbone of the Cat truck.

Box-Section Design

The 773D frame uses a box-section design, incorporating 17 castings in high-stress areas, with deep-penetrating and continuous wrap-around welding.


Castings have large radii with internal reinforcing ribs to dissipate stress. Castings move welds to lower stress areas and provide two to three times the strength of equivalent-sized fabricated structures.


The 773D frame provides for ease of serviceability.

Rollover Protection Structure (ROPS)

The Rollover Protection Structure (ROPS) attaches securely to four castings welded into the frame.

Suspension System

The suspension system is designed to dissipate haul road and loading impacts for extended frame life.

Truck Bodies

Caterpillar builds a variety of rugged, durable bodies to perform in the toughest mining applications.


773D bodies are designed to handle a variety of material densities. Maximum payload is reached in three to five passes from a matched Cat loader.

Sidewall and Floor Junctions

Sidewall and floor junctions are joined by 5-sided beams to resist impact loading and sustained hauling stresses.

Box-Section Beams

Box-section beams offer increased durability in the floor, sidewalls, top rail, corner and cab canopy areas.

400 Brinell Steel

400 Brinell steel wear surfaces provide excellent wear resistance and are easily welded without preheating procedures.


Two-stage hoist cylinders provide fast dump cycle times.

Standard Body

The standard body comes exhaust heated with options including a full-time muffler or exhaust diverter.

Custom Attachments

Custom attachments including tail extensions, liner packages, sideboards and other custom designs are offered to help ensure rated payload.

Operator Station

Control ease and comfort maximizes productivity.

Dash Panel

The wraparound dash panel is provided in an easy line-of-sight arrangement, using LED backlit rocker switches.


The Caterpillar Contour Series Air Suspension seat is standard. The seat is fully adjustable and includes an adjustable right-hand armrest.

Steering Wheel

Tilt/telescoping steering wheel with ergonomic grip improves comfort and control.

Transmission Console

Transmission console has LED backlit gear numbers and ergonomic shift knob.


Exceptional all-around visibility reduces fatigue and improves productivity.


Integral, sound-suppressed ROPS/FOPS Cab is resiliently mounted providing a quiet, protected work environment.

Front Brake Cut-out Switch

Front brake cut-out switch increases front brake component life.

Storage Compartment

Large storage compartment is located under the trainer's seat.

Trainer's Seat

Trainer's seat with increased hip/shoulder room, backrest and retractable seat belt.

Caterpillar Electronic Monitoring System (CEMS)

Caterpillar Electronic Monitoring System (CEMS) provides critical data. The system features three separate displays.

Heater/Air Conditioner

A standard heater and optional air conditioner with four-speed fan and nine vents.

Foot Pedals

Ergonomically designed foot pedals for increased operator comfort. Secondary brake moved to floor.


Electric power window for simplified operation.

Hoist Lever

Electrohydraulic hoist lever is finger tip actuated and provides low-impact body-down snubbing.

Truck Production Management System (TPMS)

Truck Production Management System (TPMS) - optional - provides payload and cycle time data.

Automatic Retarder Control (Optional)

Electronically controls braking on grades for improved engine and brake component life.

Engine Overspeed Protection

With the accelerator depressed and/or ARC turned off, ARC will automatically activate at 2,475 rpm to help avoid potentially destructive and often costly engine overspeeds.

Operating Efficiency

ARC results in increased operating efficiency with faster downhill speeds. By maintaining consistently higher engine speeds, average truck speed will be higher than a manually controlled truck.


ARC results in excellent controllability and reduced operator effort. Automatic brake modulation provides a smoother ride over manual modulation, allowing the operator to focus more on truck operation down the haul road.

Component Life

ARC results in improved component life, optimized system cooling capability and reduced torque fluctuations result from the precision of ARC.

Self Diagnostic Capability

ARC results in faster troubleshooting and diagnosis with self-diagnostic capability and the ability to communicate with ET through the CAT Data Link System.

Operator Awareness

Operator awareness through electronic integration and the CEMS, alerting the operator to overspeed conditions and critical machine functions.

Traction Control System (Optional)

Electronically controls wheel slippage for improved performance.

Operator Awareness

TCS provides operator awareness through an on-dash indicator, signifying TCS is engaged.

Differential Action

TCS utilizes normal differential action to provide superior maneuvering in poor underfoot conditions.


TCS divides torque equally to reduce stress created on final drives and axles when torque is transferred to one side.

Back-up Design

TCS maintains the back-up design. Should the sensors fail, normal differential action is still available to maintain control and steering.


The 773D is designed for versatility.

Body Options

Body options include a full line of standard and custom designs based on specific customer preference, material density, loading tools and site conditions.

Tire Options

A full line of tire options, representing various manufacturers, is offered by Caterpillar to maximize performance and life for specific applications.


Attachments give the customer options to tailor trucks for specific application requirements, including Truck Production Management System, Automatic Retarder Control, Traction Control System, Custom product offerings, and Muffler/exhaust diverter.

Caterpillar System Approach

The Caterpillar system approach means increased efficiencies through "common design".

Caterpillar Production Analysis Team (PAT)

The Caterpillar Production Analysis Team (PAT) and Caterpillar software programs can assist customers with detailed, application evaluation.

Serviceability/Total Customer Support

Purchase of a Caterpillar machine includes a total commitment to customer support.

Maintenance Platform

The maintenance platform provides access to air tank, brake master cylinder and make-up tank, engine oil level, air filters, steering hydraulic tank and battery compartment.

Battery Disconnect Switch

A ground-level battery disconnect switch facilitates safe, convenient servicing and maintenance.

Diagnostics with CEMS

On-board diagnostics with CEMS provides the machine operator with a three-category warning system and quick access to stored diagnostic data.

Diagnostics with ET

Off-board diagnostics with ET allows service technicians access to stored diagnostics data reducing down time and lowering operating costs.

Air Filters

Radial seal air filters are easy to change, reducing air filter maintenance times.

Oil Filters

Vertical, spin-on oil filters provide for simplified servicing.

Quick Coupler

Quick coupler pressure taps, located in all hydraulic systems, provide clear, quick pressure checks. SOS oil analysis points make oil sampling quick, clean, and easy.

Electrical Connectors

Sealed electrical connectors lockout dust and moisture. The color-coding for wires is standard for the entire Cat product line.

Machine Management Service

Cat dealers help manage equipment investments.

Part Availability

The Caterpillar worldwide computer network locates parts instantly to minimize machine downtime.

Literature Support

Caterpillar manuals are easy to use and help provide the full value of an equipment investment.

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