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Underground Mining Trucks(Non Current)

Caterpillar offers a range of Underground Mining equipment, such as Underground Loaders, Underground Trucks and innovative haulage systems to suit your high production demands and lower your cost per ton. We offer several configurations and optional packages to match your specific needs.

AD55B Underground Articulated Truck

The AD55B underground articulated truck is designed for high production, low cost-per-ton hauling in underground mining applications. Rugged construction and simplified maintenance guarantee long life with low operating costs. Engineered for performance, designed for comfort, built to last.

Product Details


Engine Model Cat® C27 ACERT™
Rated Power 2000.0 RPM
Gross Power – SAE J1995 600.0 kW
Bore 137.2 mm
Stroke 152.4 mm
Displacement 27.0 L
Gross Power – SAE J1995 (1st gear/2-7th gear) 579/600 kW (776/805 hp)
Net Power – 80/1269/EEC 540/560 kW (725/751 hp)
Net Power – ISO 9249 540/560 kW (725/751 hp)
Net Power – SAE J1349 (1st gear/2-7th gear) 540/560 kW (725/751 hp)

Operating Specifications

Gross Machine Operating Weight 105000.0 kg
Nominal Payload Capacity 55000.0 kg

Body Capacities

Ejector Body 26.9 m3
Dump Body – 1 26.9 m3
Dump Body – 2 32.6 m3
Dump Body – 3 33.8 m3
Dump Body – 4 36.6 m3


Empty 50000.0 kg
Loaded 105000.0 kg
Empty – Front Axle 34200.0 kg
Empty – Rear Axle 15800.0 kg
Loaded – Front Axle 52920.0 kg
Loaded – Rear Axle 52080.0 kg

Weight Distribution

Empty – Front Axle 68.4%
Empty – Rear Axle 31.6%
Loaded – Front Axle 50.4%
Loaded – Rear Axle 49.6%

Body Hoist

Raise 12.0 Seconds
Lower 24.0 Seconds
Total Cycle Time 36.0 Seconds

Turning Dimensions

Outside Clearance Radius 10005.0 mm
Articulation Angle 42.5 Degrees
Frame Oscillation 10°
Inside Turning Radius 5540.0 mm

Service Refill Capacities

Engine Crankcase with Filter 99.0 L
Transmission 53.0 L
Hydraulic Tank 258.0 L
Cooling System 138.0 L
Front Differentials and Final Drives 138.0 L
Rear Differentials and Final Drives 138.0 L
Fuel Tank 960.0 L


Forward 1 6.6 km/h
Forward 2 9.3 km/h
Forward 3 12.5 km/h
Forward 4 16.8 km/h
Forward 5 22.7 km/h
Forward 6 30.7 km/h
Forward 7 41.5 km/h
Reverse 1 8.7 km/h


Tire Size 35 × 65 R33


Brakes ISO 3450, AS2958.1, CAN-CSA424.30-M90
Cab/FOPS ISO 3449, SAE J231, AS2294.3, EN13627
Cab/ROPS ISO 3471, SAE J1040, AS2294.2, EN13510

Final Drives

Differential Ratio 3.46:1
Final Drive Ratio 5.5:1
Total Reduction Ratio 19.04:1

Power Train - Engine

The Cat® C27 Engine is built for power, reliability and efficiency.

ACERT™ Technology

The Cat C27 is U.S. EPA Tier 2 and EU Stage II compliant. It delivers higher power and greater durability for maximum hauling performance in the most demanding mining applications. Complete system integration of the engine and transmission optimizes performance and efficiency.

Power Increase

The 21.8% power increase over previous models provides unequalled lugging force during acceleration and less down-shifting on grade. Improved software and updates in engine technology further improve transmission shifting and decrease fuel consumption.

Watercooled Turbocharged and ATAAC

Air-to-air aftercooling provides improved fuel economy by packing cooler, denser air into cylinders for more complete combustion of fuel and lower emissions.

Electronic Unit Injection (EUI)

The electronically controlled unit injection fuel system senses operating conditions and regulates fuel delivery for optimum fuel efficiency. The proven high-pressure fuel system provides improved response times and more efficient fuel burn with lower emissions and less smoke.

Electronic Control Module (ECM)

ECM utilizes advanced engine management software to monitor, control and protect the engine utilizing self-diagnosing electronic sensors. The computerized system senses operating conditions and power requirements and adjusts engine for peak performance and most efficient operation at all times.


Caterpillar designed one-piece cast iron block provides maximum strength and durability. Two-piece articulated pistons with forged steel crowns are designed to withstand higher cylinder pressure.

Power Train - Transmission

More power to the ground for greater productivity.

Mechanical Power Train

The Cat® mechanical drive power train and power shift transmission provide unmatched operating efficiency and control on steep grades, in poor underfoot conditions, and on haul roads and drives with high rolling resistance.


The Cat seven-speed planetary power shift transmission is matched with the direct-injection C27 engine with ACERT™ technology to deliver constant power over a wide range of operating speeds.

Robust Design

Designed for rugged underground mining conditions, the proven planetary power shift transmission is built for long life between overhauls.

Lock Up Torque Convertor

Combines maximum rimpull and cushioned shifting of torque converter drive with the efficiency and performance of direct drive. When engaged, lock-up provides superior power train efficiency by delivering more power to the wheels.

Lock-Up Clutch

Quickly releases and re-engages to reduce power train torque loads for smoother shifting, long life and a more comfortable ride.

Smooth Shifting

Individual clutch modulation provides smooth clutch engagements to optimize performance and extend clutch life.

Final Drives

Cat final drives work as a system with the planetary power shift transmission to deliver maximum power to the ground. Built to withstand the forces of high torque and impact loads, final drives provide high torque multiplication to further reduce drive train stress.

Full Floating Axles

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

Engine/Power Train Integration

Intelligent electronics for overall optimal performance.

Cat Data Link

Electronically integrates machine computer systems to optimize overall power train performance, increase reliability and component life, and reduce operating costs.

Electronic Technician (Cat ET)

Cat ET service tool provides service technicians with easy access to stored diagnostic data through Cat Data Link to simplify problem diagnosis and increase availability.

Overspeed Protection

The transmission control electronically senses engine conditions and automatically up-shifts to prevent overspeeding.

Cat Brake System

Superior control for operator confidence.

Integrated Braking System

The Cat oil-cooled braking system delivers reliable performance and control in the most extreme underground mining conditions. The integrated system combines the service, secondary, parking brake and retarding functions in the same robust system for optimum braking efficiency.

Oil-Cooled Multiple Disc Brakes

Four-wheel, forced oil-cooled, multiple disc service brakes are continuously cooled by a water-to-oil heat exchangers for exceptional, non-fade braking and retarding performance.

Brake Design

Brakes are designed for reliable, adjustment-free operation and performance. Cat oil-cooled disc brakes are completely enclosed to prevent contamination and reduce maintenance.

Long Life

An oil film prevents direct contact between the discs. This design absorbs the braking forces by shearing the oil molecules and carrying heat away to extend brake life.

Automatic Retarder Control (ARC)

Electronically controls retarding on grade to maintain optimum engine RPM and oil cooling. Additional braking may be applied using the manual retarder or the brake pedal.

Faster Speeds

ARC allows the operator to maintain optimum engine speeds for faster downhill hauls and greater productivity.

Superior Control

Automatic brake modulation offers a smoother ride and greater control, allowing the operator to concentrate on driving.

Ease of Operation

ARC increases operating ease, resulting in greater operator confidence with less fatigue.

Engine Overspeed Protection

ARC automatically activates when engine speed exceeds factory preset levels, reducing potentially damaging engine overspeeds.

Fuel Efficiency

The engine provides additional retarding by running against compression on downhill hauls. The engine ECM reduces fuel injection for exceptional fuel economy.

Operator Comfort

Ergonomically designed for all-day comfort, control and productivity.

The AD55B operator station is ergonomically designed for total machine control in a comfortable, productive and safe environment. All controls, levers, switches and gauges are positioned to maximize productivity and minimize operator fatigue.

Protective Structure

Integral to the cab and frame, both the Rollover Protective Structure (ROPS) and Falling Objects Protective Structure (FOPS) are resiliently mounted to the mainframe to isolate the operator from vibration for a more comfortable ride.

Standard Enclosed Cab

Standard sound-suppressed ROPS cab provides a quiet, secure and comfortable air-conditioned working environment with fresh, pressurized, temperature-controlled air circulation.

Suspension Seat

Ergonomic, fully adjustable suspension seat provides optimal operator comfort. Thick cushions reduce pressure on lower back and thighs. Wide, retractable seat belts provide a secure, comfortable restraint.

Steering Column

Comfort wheel with tilt steering provides a comfortable driving position, secure grip and greater control.

Monitoring System

Cat Electronic Monitoring System (Cat EMS) continuously provides critical machine data to keep the machine performing at top production levels. Displays are backlit for easy viewing.

Truck Body Systems

Rugged performance and reliability in tough underground mining applications.

Cat Truck Bodies

Caterpillar offers two specific body styles for the most efficient hauling solutions at the lowest cost-per-ton.
  • Dump Body
  • Ejector Body
The ejector body can now be easily removed and a dump body fitted for greater machine versatility.

Body Selection

Selection of the right body depends on material, haul road, and dump conditions. The better the match of body to application, the greater the efficiency. Your Cat dealer can help you select the right body system for your site specific application.

Body Design

Cat truck bodies are designed for optimal strength, capacity and durability. Drawing on years of experience in truck body design, Cat Truck Bodies are designed for long service life and low cost per ton.

Body/Chassis Integration

Cat truck bodies are designed and matched with the integrated chassis system for optimum structural reliability, durability and long life.

Fast Hoist Cycle Times

Single-stage hoist cylinders provide fast dump cycle times of 12 seconds for raise and 24 seconds for lower.

Load Carrying Capacity

Large target area provides high load carrying capacity. Its diverging flow design gives clean load ejection, which maximizes production and avoids material carryback.

Truck Payload Management System (TPMS)

The optional TPMS system calculates the payload the truck is carrying and determines truck cycle times.

Ejector Body

The ejector body offers clean load ejection and the capability to work in areas with restricted overhead clearance and soft underfoot conditions.


Rugged Cat structures - the backbone of the AD55B’s durability.

Frame Design

The frame uses box-section design with stiff frame beams to resist twisting forces. Materials and weld joints are matched to optimize the structural life of the frame.

Articulating/Oscillating Hitch

This system provides steering and oscillation and enables the truck to maintain all wheel ground contact in rough terrain.

Suspension System

Two independent variable rebound suspension cylinders dissipate haul road forces for longer frame life and a comfortable ride.


More time for production.

Service Access

Easy access to daily service points simplifies servicing and reduces time spent on regular maintenance procedures.

Ground-Level Access

Allows convenient servicing to tanks, filters, lubrication points and compartment drains.


Electronic control system enables quick diagnosis of engine conditions and effective maintenance and repairs utilizing the Cat Electronic Technician (Cat ET) Service Tool.

Air Filters

Radial seal air filters are easy to change, reducing time required for air filter maintenance.

Sight Gauges

Makes fluid level checks quick and easy. These include the hydraulic, transmission and coolant reservoirs.

Sealed Electrical Connectors

Electrical connectors are sealed to lock out dust and moisture. Harnesses are covered for protection. Wires are color and number coded for easy diagnosis and repair.

Scheduled Oil Sampling

S•O•SSM helps avoid minor repairs becoming major ones.

Customer Support

Cat® dealer services keep underground mining equipment productive.

Cat dealers offer solutions, services and products that help lower costs, enhance productivity and manage your operation efficiently. From the selection of Cat equipment until the day you rebuild, trade or sell it, the support you get from your Cat dealer makes the difference that counts.

Dealer Capability

Cat dealers will provide the level of support you need, on a global scale. Dealer expert technicians have the knowledge, experience, training and tooling to handle your repair and maintenance needs, when and where you need them.

Product Support

When Cat products reach the field, they are supported 24/7 by a worldwide network of reliable and prompt parts distribution facilities, dealer service centers, and technical training facilities to keep your equipment up and running.

Service Support

Cat equipment is designed and built to provide maximum productivity and operating economy throughout its working life. Cat dealers offer a wide range of service plans that will maximize return on your investment, including:
  • Preventive Maintenance Programs
  • Diagnostic Programs, such as Scheduled Oil Sampling and Technical Analysis
  • Rebuild and Reman Options
  • Customer Support Agreements

Technology Products

Cat dealers offer a range of advanced technology products designed to improve efficiency, productivity and lower costs.

Operator Training

Today’s complex products require operators have a thorough understanding of machine systems and operating techniques to maximize efficiency and profitability. Your Cat dealer can arrange training to improve productivity, decrease downtime, reduce operating costs, enhance safety, and improve your return on investment.

Application Awareness

Application and site-specific factors, such as: material density, loading position, grades, speeds, and haul road design influence operating and maintenance costs. Your Cat dealer can provide you with the understanding to optimize productivity and the total cost of ownership.


For more complete information on Cat products, dealer services, and industry solutions, visit us on the web at www.cat.com.


Designed with safety as the first priority.

Product Safety

Caterpillar has been and continues to be proactive in developing mining machines that meet or exceed safety standards. Safety is an integral part of all machine and systems designs.

Engine Shutoff Switch

A secondary engine shutoff switch is located at ground level.

Integral ROPS Cab

Integral to the cab and frame, the ROPS is resiliently mounted to the frame to isolate the operator from vibration for a more comfortable ride.

Brake Systems

Four corner oil-cooled braking system provides excellent control. The service brakes and retarding system are actuated by modulated hydraulic pressure, while the parking brake function is spring applied and hydraulic released. This system assures braking in the event of loss of hydraulic pressure.

Operator Present System

Automatically engages parking brake, neutralizes steering, implement and transmission control, and shuts down the engine in the event the operator fails to apply the park brake prior to exiting the cab.

Standard Safety Features

Anti-skid upper deck surfaces, upper deck handrails, 3-point cabin and machine access, push out safety glass, excellent visibility, suspension seat, passenger/training seat, inertia reel retractable belts, steering frame lock, rear window guard, body retaining pins, automatic retarder control, exhaust heat shielding and firewall fitted standard, hitch hydraulic hoses - burst protection sleeves fitted, tailgate retaining pins (ejector body), alternate exit via windows, ground level compartment sight glasses, hot and cold side of engine.


For more complete information on safety, please visit http://safety.cat.com.
    •  Alarm, back-up
    •  Alternator, 95 amp
    •  Batteries, maintenance free
    •  Battery disconnect switch-ground level
    •  Brake and tail lights
    •  Cat Electronic Monitoring System (Cat EMS)
    •  Corrosive protection spray
    •  Diagnostic connector
    •  Engine shutdown switch
    •  Headlights with dimmer switch
    •  Jump start receptacle
    •  Rear work light (cab mounted)
    •  Reversing lights
    •  Starting and charging system (24-volt)
    •  Turn signal indicators
    •  Cab pressurizer
    •  Rear view mirrors
    •  Radio ready
    •  ROPS/FOPS cab with air conditioning
    •  Storage compartment
    •  Suspension seat with retractable seat belt
    •  Tilt/telescopic steering wheel
    •  Trainer/passenger seat and seat belt
    •  Windshield wiper and washer
    •  All wheel disc brakes
    •  Automatic retarder control
    •  Auto shift transmission 7 speed forward/1 speed reverse
    •  Control throttle shifting
    •  12 cylinder C27 ACERT™ ATAAC diesel engine
    •  Long life coolant
    •  Parking brakes (four wheels)
    •  Programmable gear blockout with body up
    •  Programmable ground speed limiting
    •  Torque converter with automatic lockup
    •  Articulated and oscillated hitch
    •  Belly guards
    •  Centralized lubrication points
    •  Dump body (26.9 m3 - 35.2 yd3)
    •  Exhaust catalytic converter/muffler
    •  Exhaust covers
    •  Firewall
    •  Frame lifting lugs
    •  Front and rear tow pin
    •  Front axle suspension
    •  Oil sample adapters
    •  Residual brake pressure switch
    •  Tires - 35/65 R33 VSNT radial tires
    •  Body up alarm
  • Articulated and oscillated hitch
    • Belly guards
      • Centralized lubrication points
        • Dump body (26.9 m3 - 35.2 yd3)
          • Exhaust catalytic converter/muffler
            • Exhaust covers
              • Firewall
                • Frame lifting lugs
                  • Front and rear tow pin
                    • Front axle suspension
                      • Oil sample adapters
                        • Residual brake pressure switch
                          • Tires - 35/65 R33 VSNT radial tires
                            • Body up alarm
                              • Bodies
                                •  Dump, (32.6 m3 - 42.6 yd3)
                                •  Dump, (33.8 m3 - 44.1 yd3)
                                •  Dump, (36.6 m3 - 47.9 yd3)
                                •  Ejector, (26.9 m3 - 35.2 yd3)
                                •  Ejector, (29.4 m3 - 38.5 yd3)
                                •  Body liners, heavy duty
                              • Color camera and monitoring system
                                • EAM (Electronic Access Module)
                                  • Engine shutdown on fire system activation
                                    • Fast fill system
                                      •  Coolant
                                      •  Engine
                                      •  Fuel
                                      •  Hydraulic
                                      •  Transmission
                                    • Fire extinguisher, hand held
                                      • Front rubber bumpers
                                        • ID numbers for rims
                                          • Idle timer
                                            • Isolation switches
                                              • Onboard fire system, 65L
                                                • Retractable visor group
                                                  • Seat covers
                                                    • Secondary steering system
                                                      • Spare rim
                                                        • TPMS (Truck Payload Measurement System)
                                                          • TPMS remote display payload indicator
                                                            Built for it