Overview
The 771D Quarry Truck is engineered for performance, designed for comfort, and built to last. The 771D is designed for high production and low cost-per-ton hauling in quarry applications. It has a reliable and durable operation and the rugged construction and easy maintenance can help extend life with low operating costs.
Benefits & Features
Specifications
Benefits & Features
Power Train
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 six-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 13.15:1 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 site gauges.
Axles
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.
Engine
Diesel Engine
The Cat 3408E Diesel Engine is a four-stroke design that uses long 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
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
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 brake life.
Pistons
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.
Structures
Box-Section Design
The 771D frame uses a box-section design, incorporating 17 castings in high-stress areas, with deep-penetrating and continuous wrap-around welding.
Castings
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.
Frame
The 771D 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.
Flat Floor Body
Quarry Body
The flat floor quarry body offers excellent load retention on grades up to 12 percent and on smoother haul road conditions.
771D Bodies
771D Bodies are designed to handle a variety of material densities. Maximum payload is reached in three to five passes from a matched Cat loader.
Construction
Body floor construction uses a 12 degree single slope, offering excellent wear characteristics and uniform dumping into hoppers, crushers, and feeders.
Sidewall and Floor Junctions
Sidewall and floor junctions are joined by five-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.
HARDOX 400 Steel
HARDOX 400 steel wear surfaces provide excellent wear resistance and are easily welded without preheating procedures.
Cylinders
Two-stage hoist cylinders provide fast dump cycle times.
Standard Body
Standard body comes exhaust heated with options including a full-time muffler or exhaust diverter.
Operator Station
Dash Panel
The wraparound dash panel is provided in an easy line-of-sight arrangement, using LED backlit rocker switches.
Seat
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.
Visibility
Exceptional all-around visibility reduces fatigue and improves productivity.
Cab
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.
Window
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)
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.
Controllability
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)
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.
Torque
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.
Systems/Applications
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
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
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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