771D^Non-Current

Cat 3408E Diesel Engine

The four-stroke design uses long power strokes for more complete fuel combustion and optimum efficiency. Large displacement and a low speed rating can help extend engine life.

Torque Rise

The 26 percent torque rise provides high lugging force during acceleration on grade or in high rimpull conditions. The torque rise effectively matches the transmission shift points to provide maximum efficiency and faster cycle times.

Hydraulic Electronic Unit Injector (HEUI)

The HEUI is a proven high-pressure, direct injection fuel system. This system electronically monitors operator and machine inputs to optimize engine performance. HEUI is unique in its ability to independently control injection pressure over the entire engine operating range. This allows complete control over injection timing, duration, performance and efficiency.

Electronic Control Module (ECM)

The ECM monitors key functions and logs critical indicators. The Electronic Technician can access this diagnostic information for easier maintenance and repair.

Cooling System

Superior cooling in the hottest work conditions.

Transmission

The Cat seven-speed, power shift transmission, matched with the direct-injection 3408E diesel engine provides constant power over a wide range of operating speeds.

Cat Data Link

The Cat Data Link electronically integrates teh machine's computer systems, which allows communications and provides the following benefits:

Elevated Idle Neutral Coast Inhibitor

Helps prevent the transmission from shifting to neutral at speeds above 6.5 km/h (4mph).

Body-up Shift Inhibitor

Helps prevent the transmission from shifting above a pre-programmed gear without the body fully lowered.

Event Memory

Records machine management data that can be accessed using the Electronic Technician. Recorded information includes:
• Shift histograms
• Operator-induced events
• Lock-up clutch counter
• Machine overspeed
• Transmission overspeed

Electronic Technician (ET)

The electronic engine and transmission controls provide exhaustive diagnostic capability for service technicians. The ability to store both active and intermittent indicators will simplify problem diagnosis and total repair time, resulting in improved mechanical availability and lower operating cost. ET accesses data stored in the engine and transmission controls via the Cat Data Link System. ET displays the status of all engine parameters including throttle position, timing and fuel flow. ET replaces 13 mechanical tools to perform functions like cylinder cutout checks, injector solenoid tests and timing calibration.

Caterpillar Electronic Monitoring System (CEMS)

CEMS allows the operator to view requested information and utilizes a three-category warning system to alert the operator to abnormal machine conditions.

Optional Attachments

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

Multiple Disc Brakes

Caterpillar forced oil-cooled, multiple disc brakes are continuously cooled for exceptional, fade-resistant braking and retarding. The optional ARC and TCS utilize the oil-cooled rear brakes to enhance truck performance and increase productivity.

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 systems.

Oil Film

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

Secondary Braking

Spring applied, hydraulically released, oil-cooled disc brakes are located on the rear axle. The front brakes will activate as part of the secondary system, even if switched out of service.

Parking Brakes

Spring applied, hydraulically released parking brakes use wet disc brakes in service system. A toggle switch activates the parking brakes.

Pistons

A Caterpillar patented, two-piston design combines the service, secondary and parking brakes, along with retarding functions. The primary piston hydraulically actuates both service and retarding functions. The secondary piston is spring-applied and held in the disengaged position by hydraulic pressure. If hydraulic system pressure drops below a certain level, the spring-applied secondary piston automatically applies the brakes.

Cat Retarding System

The Caterpillar retarding system has an intermittent rating of 895 kW (1,200 hp) and a continuous rating of 433 kW (581 hp). When retarding, the engine runs against compression on downhill hauls, resulting in no fuel burn. Retarding forces and heat are absorbed through the oil. The retarding system generates lower drive line stresses than drive line retarding systems.

Automatic Retarder Control (Optional)

The ARC electronically controls braking on grade to maintain approximately 2,230 engine rpm (engine rpm is adjustable from 2,160-2,300 rpm in increments of 10 rpm). ARC is deactivated when the operator applies the brakes or throttle.

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.

ARC Benefits

Include:
• Increased operating efficiency with faster downhill speeds. By maintaining consistently higher engine speeds, average truck speed will be higher than a manually controlled truck.
• 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.
• Improved component life, optimized system cooling capability and reduced torque fluctuations result from ARC's precision.
• Faster troubleshooting and diagnosis with self-diagnostic capability and the ability to communicate with ET through the Cat Data Link System.
• Operator awareness through electronic integration and CEMS, alerting the operator to overspeed conditions and critical machine functions.

Traction Control System (Optional)

Monitors wheel slip so if it exceeds the set limit, the oil-cooled disc brakes are automatically applied to slow the spinning wheel.

Note

Caterpillar offers Integrated Braking Control (IBC) (optional), combining ARC and TCS into one electronic control.

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. Mild steel, which provides flexibility, durability and resistance to impact loads even in cold climates is used throughout.

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 Serviceability

The box-section frame allows simple access to power train components. This "open design" reduces overall removal and installation time, lowering repair costs. Transmission access is excellent under the raised and pinned body. Repairs can be made without preheating in ambient temperatures 16° C (60° F) using readily available welding supplies.

Rollover Protection Structure (ROPS)

The ROPS attaches securely to four castings welded into the frame.

Suspension System

Designed to dissipate haul road and loading impacts for extended frame life. Four, independent, variable-rebound, suspension cylinders absorb shocks. Rear cylinders allow axle oscillation and absorb the bending and twisting stresses. Front cylinders, mounted to the frame, serve as steering kingpins, providing excellent maneuverability and reduced maintenance. Caster and camber are preset.

Design

771 bodies are designed to handle a variety of material densities. Maximum payload is reached in three to five passes from a matched Cat loader in 1620 kg/m3 (2,700 lb/yd3) material and higher.

Flat Floor Quarry Body

Offers excellent load retention on grades up to 12 percent and on smoother haul road conditions.

Sidewall and Floor Junctions

Are joined by five-sided beams to resist impact and loading and sustained hauling stresses.

Box-Section Beams

Offer increased durability in the floor, sidewalls, top rail, corner and cab canopy areas.

HARDOX 400 Steel

Wear surfaces provide excellent wear resistance and are easily welded without preheating procedures.

Two-Stage Hoist Cylinders

Provide fast dump cycle times of 7.5 seconds - Raise and 8.3 seconds - Lower.

Standard Body

Comes exhaust heated with options including a full-time muffler or exhaust diverter.

1 Wraparound Dash Panel

Offers an easy line-of-sight arrangement, using LED backlit rocker switches.

2 Caterpillar Contour Series Air Suspension Seat

Standard and fully adjustable, including an adjustable right-hand armrest.

3 Tilt/Telescoping Steering Wheel

With ergonomic grip improves comfort and control. Low effort system and ergonomically designed retarder lever reduces operator fatigue. Also includes an enhanced turn signal lever with high beam actuator and electric windshield wiper controls.

4 Transmission Console

Has LED backlit gear numbers and ergonomic shift knob.

5 Visibility

Exceptional all-around viewing area reduces fatigue and improves productivity.

6 Integral, Sound-Suppressed ROPS/FOPS Cab

Is resiliently mounted providing a quiet, protected work environment. The cab is radio-ready with speakers, wiring harness, antenna and mounting bracket.

7 Front Brake Cut-Out Switch

Increases front brake component life.

8 Large Storage Compartment

0.10 m3 (3.5 ft3) of space is located under the trainer's seat.

9 Trainer's Seat

Includes back rest and retractable seat belt.

10 Caterpillar Electronic Monitoring System (CEMS)

Provides critical data. The system features three separate displays:
• Four-gauge cluster with coolant temperature, oil temperature, brake air pressure, fuel level
• Tachometer, digital speedometer/actual gear indicator
• Message center module

11 Standard Heater and Optional Air Conditioner

Includes four-speed fan and nine vents.

12 Foot Pedals

Ergonomically designed for increased operator comfort.

13 Electric Power Window

For simplified operation.

14 Electrohydraulic Hoist Lever

Is finger-tip actuated and provides low impact body-down snubbing.

15 Truck Production Management System (TPMS) (Optional)

Provides payload and cycle time data.
• Cat developed technology utilizes strut pressure sensors and an on-board microprocessor to determine payload weight.
• Accurate under normal loading to within ± five percent over a normal operating shift.
• Delivers consistent accurate payloads and improves efficiency by minimizing overloading and underloading
- On-board computer stores 1,400 cycles for further analysis of payload weight, cycle segment times, cycle segment distances and actual clock time and date of each cycle. - External lights signal loading tool operator when payload is reached. - Internal troubleshooting and fault recording for easier maintenance.

Machine Configuration Options

Caterpillar offers a variety of machine configuration options to help meet customer needs.

System Approach

The Caterpillar system approach means increased efficiencies through common design. Haul trucks, loaders, excavators, tractors, engines for generator sets and pumps - all designed by Caterpillar - use common components, parts and design. Commonality reduces customer parts stock, improves parts availability, reduces training/maintenance and improves diagnostics. This system approach adds up to lower cost-per-ton. Dealer support is available to address customer needs regardless of the component.

Caterpillar Product Analysis Team (PAT)

Combined with Caterpillar software programs can assist customers with detailed, application evaluation.

Loader Match

Designed to work as part of a system, the 771D is best matched to the following Caterpillar loaders:
• 980G - four to five pass/match
• 988G - three to four pass/match
• 5080 - four to five pass/match
• 375ME - four to five pass/match

Cat QuickEvacTM

Is an exclusive Caterpillar on-board engine oil evacuation and prelubrication system.

Maintenance Platform

Provides access to air tanks, brake master cylinder and make-up tank; engine oil level; air filters; steering hydraulic tank; and battery compartment.

Ground Level Battery Disconnect Switch

Facilitates safe, convenient servicing and maintenance.

On-Board Diagnostics

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

Off-Board Diagnostics

With ET, allows service technicians access to stored diagnostics data reducing downtime and lowering operating costs. ET stores engine parameter information such as timing, throttle position and fuel flow. Transmission data is available through ET via access to the Cat Data Link System.

Radial Seal Filters

Are easy to change, reducing air filter maintenance times.

Vertical, Spin-on Oil Filters

Provide for simplified servicing.

Quick Coupler Pressure Taps

Located in all hydraulic systems provide clear, quick pressure checks. S·O·SSM oil analysis points make oil sampling quick, clean and easy.

Sealed Electrical Connectors

Lockout dust and moisture. Color-coded wiring is standard for the entire Cat product line.

Machine Management Service

Cat Dealers help manage equipment investments with:
• Vehicle systems analysis to help match the right machine to the job
• Preventative maintenance programs
• S·O·S oil analysis and technical analysis programs
• Repair option analysis
• Training for operators and mechanics
• TPMS data analysis

Parts 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.