Cat 773G (Tier 2)

Off-Highway Trucks

About the Cat 773G (Tier 2)


G Series represents a new era for the 773, and with your long-term success as our goal, we've developed this truck to be more productive and economical. It offers your operators the confidence, comfort and control to run at peak efficiency, and it can feed your crushers and haul material at a lower cost per ton. When you also consider its performance and fuel efficiency, the 773G is the right truck for our generation.


Engine Model Cat® C27 ACERT™
Rated Engine Speed 2000 r/min
Gross Power - SAE J1995 578 kW
Net Power - SAE J1349 546 kW
Net Power - 80/1269/EEC 552 kW
Net Power - ISO 9249 552 kW
Bore 137 mm
Stroke 152 mm
Displacement 27 l
Engine Power - ISO 14396 569 kW
Net Torque 3646 N·m
Peak Torque - Speed 1300 r/min
Weights - Approximate
Maximum Gross Vehicle Weight 102740 kg
Operating Specifications
Nominal Payload Class (100%) 56 ton (US)
Top Speed - Loaded 67.6 km/h
Body Capacity - SAE 2:1 35.75 m³
Maximum Working Payload (110%) 61.5 ton (US)
Not to Exceed Payload (120%)* 67.1 ton (US)
Forward - 1 10.8 km/h
Forward - 2 15.1 km/h
Forward - 3 20.4 km/h
Forward - 4 27.4 km/h
Forward - 5 37 km/h
Forward - 6 50.1 km/h
Forward - 7 67.6 km/h
Reverse 14.1 km/h
Final Drives
Differential Ratio 3.64:1
Planetary Ratio 4.80:1
Total Reduction Ratio 17.49:1
Brake Surface - Front 655 cm²
Brake Surface - Rear 61269 cm²
Brake Standards ISO 3450:1996
Body Hoists
Pump Flow - High Idle 448 l/min
Relief Valve Setting - Raise 17250 kPa
Relief Valve Setting - Lower 3450 kPa
Body Raise Time - High Idle 9.5 s
Body Lower Time - Float 13 s
Body Power Down - High Idle 13 s
Capacity - Dual Slope - 100% Fill Factor
Struck 26.86 m³
Heaped 2:1 (SAE) 35.75 m³
Capacity - Flat Floor - 100% Fill Factor
Struck 26.25 m³
Heaped 2:1 (SAE) 35.49 m³
Weight Distributions - Approximate
Front Axle - Empty 53 %
Front Axle - Loaded 35 %
Rear Axle - Empty 47 %
Rear Axle - Loaded 65 %
Rear axle - Oscillation 8.1 °
Empty Loaded Cylinder Stroke Front 234 mm
Empty Loaded Cylinder Stroke Rear 149 mm
Service Refill Capacities
Fuel Tank 795 l
Cooling System 171 l
Differential - Final Drives 145 l
Steering Tank 36 l
Steering System - Including Tank 54 l
Brake Hoist System 322 l
Brake/Hoist Hydraulic Tank 176 l
Crankcase 90 l
Torque Converter - Transmission System - HRC 70 l
Torque Converter - Transmission System - LRC 61 l
Standard Tire 24.00R35 (E4)
ROPS/FOPS Standards Standards
Sound Standards Standards
Turning Diameter - Front 23.5 m
Steering Standards SAE J1511 FEB94 ISO 5010:1992
Steer Angle 31 °
Turning Circle - Clearance Diameter 26.1 m



Key Features
The 773G is solidly constructed for safety.
  • Rollover and Falling Object protection is part of the cab structure
  • Emergency egress is available through the right-side hinged window
  • Laminated glass is used in the front and left side windows
  • Ground level engine shutdown for convenience and safety
  • A back up alarm gives advance warning of truck movement
Operator Safety
The 773G provides operators with full shift comfort and safety features.
  • Fully adjustable and suspended seat
  • Integrated three point safety belt
  • A trainer's seat with lap belt facilitates on-the-job task training
  • Audible warnings signal events, and fluid level monitoring is available from inside the cab
  • In some instances, the truck will automatically derate engine power for safety
Job Site Safety
  • Speed limiting on the haul is new and more efficient than gear limiting
  • Secondary steering in the event of power loss
  • Speed limiting during body up operations
A Focus on Personnel
The 773G is designed to minimize hazards associated with working on and around this truck.
  • Ground level daily check points
  • Low effort, integrated access system with hand rails for three points of contact
  • Aggressive tread plate on all step areas, and lighting for after dark
  • Folding windshield washing platform offers solid footing for cleaning the windshield
Confidence and Control
Confident operators will move material quickly, efficiently and profitably.
  • Brake design updates increase slope holding capability and include a brake wear indicator
  • Wet disc braking for rear wheels; dry disc braking on the front
  • Automatic Retarding Control for downhill grades
  • New traction control system
The 773G supports your site safety plan with excellent visibility to the job site.
  • Work Area Vision System (WAVS) is a camera system that enhances visibility behind the truck
  • Lighting and mirror packages are available to suit your site conditions

Operator Work Environment

The comfort of your crew will contribute to their productivity and awareness on the job.
  • Easy, low effort access to the cab
  • Ergonomic, intuitive controls
  • Left side power window
  • Automatic temperature control inside the cab
  • Throttle lock convenience for long uphill climbs
  • The cab is spacious with window area that supports visibility
  • An integrated footrest provides comfort and support
  • Sound suppression provides a quieter work environment
  • The cab is isolation mounted reducing noise and vibration
  • Lighting package options to meet operation needs
  • Automotive quality shifting from new APECS transmission controls
Confidence and Control
Strong, predictable performance will help your operators achieve the lowest cost per ton.
  • Automatic Retarding Control reduces operator effort and controls braking on downhill grades
  • Performance and health information at a glance using well lit gauges and the Advisor Message Display
  • Steering performance from a design that maintains tire alignment
  • Stopping power from fade-resistant brakes - purpose built for off road applications and the loads carried by the 773G
  • Traction control is now steering sensitive and uses the service brakes to control wheel slip. The result: faster activation and improved response to wheel slip
  • Visibility is excellent with extensive mirror options, large window areas.
Cab layout subject to change with optional equipment.
The Advisor display and VIMS™ software are important reporting tools that help you analyze:
  • Productivity, haul road efficiency, operator skill
  • Fuel use, cycle times, idle time
  • Machine health and events


As you work for a more sustainable business model, the Cat® 773G can contribute in more ways than one.
Fuel and Emissions
• There are multiple fuel saving strategies on the 773G, two are economy modes that are adjustable to meet your unique production needs
  • Operator noise is reduced by 50% using sound suppression technology in the cab
  • A rubber liner option for truck bodies reduces noise levels for both the operator and spectators
Component Life
  • Cat Reman parts are an economical alternative to new
  • You can extend tire life using TKPH/TMPH, a feature that calculates tire loading
  • Castings and box section frame construction absorb shocks and distribute loads
  • A new rear axle housing holds new, robust differential gears that compliment the power and torque increases of the truck
  • Hydraulic oil filter life is extended to 1,000 hours under normal conditions
  • Autostall enables quick operating temperatures for best performance and life
  • Delayed engine shutdown prevents hot shutdowns that can reduce component life

Cutting Your Fuel Costs

The 773G introduces several key fuel conservation features:
  • Auto Neutral Idle - as the 773G idles in a forward gear, the transmission will automatically slip in and out of a neutral state to avoid stalling the torque converter and increasing fuel consumption.
  • Engine Idle Shutdown - when your G Series truck is in park and idles for more than a preset time, the truck will initiate engine shutdown to conserve fuel. This feature can be time adjusted or turned on or off according to your specific needs.
  • Speed Limiting - while you can continue to gear limit your G Series trucks, Caterpillar offers speed limiting that allows the truck to travel at a more fuel efficient engine speed and gear selection.
  • Transmission Controls - New APECS transmission controls increase fuel efficiency by maintaining momentum and speed on grade.
Economy Modes
  • Standard Economy Mode - G Series has the ability to adjust engine power based on your site, fleet and economic conditions. You can manually control fuel burn by adjusting the power down between 0.5 and 15 percent.
  • Adaptive Economy Mode - New for G Series - this economy mode requires a baseline for production from you using the Advisor display. As the truck transits the haul cycle, it is constantly evaluating its ability to meet your baseline in a reduced power setting. Where full power is needed, full power is applied, where reduced power works, reduced power is applied. It's fully automatic with no special operation required.


The 773G will haul your material faster and more efficiently with increases in power and new APECS transmission controls.
  • A 5% increase in power improves cycle times and grade climbing performance
  • New APECS transmission controls carry more torque through the shifts, producing faster cycle times and the possibility of climbing grades in a higher gear
Traction Control
G Series introduces benefits to your fleet when running in wet conditions by introducing a more responsive traction controls system.
  • The system is steering sensitive to determine slip from high speed turns
  • The system engages at slower speeds returning traction sooner
  • The system engages sooner in the slip, potentially reducing tire wear
  • The system modulates instantly between the two wheel groups for control
  • Using the hydraulic service brakes facilitates the instant modulation and responsiveness

Long Term Value and Durability

At Caterpillar, we know that our truck is critical to your business, that's why we use industry leading technology to ensure maximum machine availability and reliability.
Structural Strength
The backbone of the 773G is its frame. Our frames are designed for off-road integrity and more than one life cycle. The 773G, with its new power and performance increases, has updated final drive gears and a new rear axle housing to support this new level of work.
  • Caterpillar strategically applies castings with box section construction to manage off-road stresses
  • A new front frame design increases the approach angle on ramps and grades
  • New heavy duty gears compliment the updates in power and torque
  • A new robust rear axle housing also supports the truck's performance
  • Front struts use our proven king pin design for effective absorption of haul road shocks
  • Rear suspension cylinders have been inverted to minimize contamination
Planetary Powershift Transmission with APECS Controls
New APECS controls improve performance with the following:
  • Torque shift management - allows the truck to power through shift points
  • Part throttle shifting - provides an exceptionally smooth ride
  • ECPC - electronically controls clutch pressures for long life
  • 5% more power gives the truck new performance levels and quick haul cycles
  • Cat MEUI™ injectors provide high pressure, fine atomization under all load conditions for fuel efficiency and responsiveness
  • Low pressure fuel lines from the tank to the engine simplify service
  • The C27 is carefully balanced with vibration controls that reduce noise and protect against unnecessary harmonics
  • Cooling is provided by either a demand fan or a conventional cooling fan
  • Ground level engine shutdown switch for safety
  • Excellent high-altitude capability (see specifications for details)
  • The steering linkage is designed to provide feedback to the operator
  • The Cat king pin front suspension system maintains steering tolerances and tire alignment
Brake Performance
Cat trucks provide powerful, fade-resistant braking for off road applications, and G Series introduces new ways to extend your brake life.
  • Rear brakes are wet disc while the front are dry, caliper type
  • Slope holding capability benefits from all wheel parking brake actuation
  • Brake life can be extended by choosing the optional Cat Engine Brake
  • Additional springs in the design reduce wear and increase service life
  • A brake wear indicator keeps you informed of maintenance timing
  • Extended life brake material is available for extreme applications

Body Options

Our truck bodies are engineered to compliment the chassis and built to haul your material for years of trouble-free performance. In fact, Cat truck bodies are designed to let the truck perform at peak efficiency by correctly centering and distributing the load. Outfitting your truck body with a steel or rubber liner may be advisable based on material type and application. If you have questions about body selection or applying liners, your Cat dealer has the tools and knowledge to help you with this decision process.
The Rubber Liner
This important factory-installed option will prolong body life in hard rock applications.
  • Available for the dual slope and flat floor bodies
  • It will reduce shock loading for both the operator and truck
  • It absorbs noise, reducing both spectator and operator sound levels
  • The rubber liner is not a good option for wet, sticky material
  • The rubber liner should not be used with our body heat option
Side Boards
In the event that your material is light weight, we offer factory-installed 150 mm (6 in) sideboards to help you achieve rated capacities. You can use our “Body Selection Guide” as a reference for selecting the correct body type and liner package. Cat dealers can order this document using reference number AEXQ0673.
Dual Slope Body
If your haul profile includes steep slopes, the dual slope body offers excellent material retention.
  • The dual slope has a SAE 2:1 heaped capacity of 35.20 m3 (46 yd3) with a steel liner configuration
  • 400 BNH steel on interior surfaces offers excellent wear characteristics
  • Material is carried low and centered for stability
  • A single 16 mm (0.62 in) steel liner option is available for this body
  • A single rubber liner is available for this body
Flat Floor Body
If you're feeding a crusher, the flat floor body is an excellent choice for metering material.
  • The flat floor body also offers excellent material retention and stability
  • 400 BNH steel is used on internal surfaces for wear protection
  • A single steel liner option is available
  • A rubber liner is also available for this body

Service Convenience

Service Centers - Electrical Connections
This bumper-mounted electrical service center provides the convenience and safety of ground level access to important service tasks.
  • Ground level access to VIMS data
  • Ground level access to an ET port
  • Includes a master disconnect switch
  • Engine lockout switch
  • Hydraulics lockout switch
  • Breaker access
Brake Monitoring
G Series introduces updates that will increase the life of your brakes.
  • A brake wear indicator is new and standard
  • Design improvements are increasing separation forces to lessen wear and increase brake life
Filter Life
  • With all new hydraulic system efficiency, your filter life is extended to 1,000 hours
  • Cab air filter life can also be extended with the optional cab precleaner.
  • Our engine oil filters are improved, and in some cases extending life beyond 500 hours
Service Centers - Fluid Fill
You will save both time and money using the optional fluid fill service center.
  • Fill and extraction for all fluids in one location
  • Key pad indicates existing fluid levels
  • Includes all oils, coolant and fuel
  • Conveniently located at ground level
  • Lighted for night time use
Product Link™
For comprehensive fleet management, Caterpillar offers Product Link solutions. This solution is a combination of machine-mounted hardware and software called Vision Link. You can access fleet information either through cellular or satellite channels. These channels may be restricted and unavailable in some countries. Customers who use Product Link are remotely monitoring machine health and organizing service requirements.



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