798 AC Electric Drive Mining Truck



Technical Specifications
Benefits and Features
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The Cat® 798 AC electric drive truck is designed to haul more — with more efficiency, controllability, and reliability than any other electric drive truck in the marketplace. And while it may be a recent addition to the Cat ultra-class lineup, it delivers the same powerful, proven performance you expect from a Cat truck. The 798 AC delivers a payload up to 372 tonnes (410 tons), high speed on grade, easier maintenance, and excellent electric retarding and brake performance. The result? Improved productivity, high availability, and more confident operators.

Weights - Approximate
Nominal Rated Payload 410 ton (US)
Rated Gross Machine Weight 1375000 lb
Chassis Weight 453826 lb
Body Weight Range 38 833 - 43 275 kg (85,611 - 95,406 lb)
Note (1) Consult your tire manufacturer for maximum tire load.
Note (2) Chassis weight with 100% fuel, hoist, body mounting group, rims, and tires.
Note (3) Body weight varies depending on how body is equipped.
Gross Power - SAE J1995 3500 HP
Engine Model Cat® C175-16
Net Power - SAE J1349 3405 HP
Optional Gross Power - SAE J1995 3100 HP
Rated Speed 1800 r/min
Emissions Rating Fuel Optimized
Bore 6.9 in
Stroke 8.7 in
Displacement 5187 in³
Note (1) Net Power advertised is the power available at the flywheel when the engine is equipped with air intake system, exhaust system, and alternator.
Note (2) U.S. EPA Tier 4 Final / EU Stage V available for applicable markets.
Note (3) Additional fuel optimized selectable power ratings: 2312 kW / 3,100 hp
Service Refill Capacities - High Altitude Only
Fuel Tank 2000 gal (US)
Cooling System 273 gal (US)
Crankcase 124 gal (US)
Hydraulic Tank 273 gal (US)
Hydraulic System (includes tank) 342 gal (US)
Steer Angle 39 °
Turning Diameter - Front 106.3 ft
Steering Standards Steering Standards: ISO 5010:2007
Note Turning Diameter (ISO 7457:1997)
Service Refill Capacities
Fuel Tank 1300 gal (US)
Fuel Tank (Tier 4) 1200 gal (US)
Diesel Exhaust Fluid Tank 100 gal (US)
Cooling System 211 gal (US)
Crankcase 82 gal (US)
Final Drive - Each 67 gal (US)
Hydraulic System - Including Tank 385 gal (US)
Hydraulic Tank 296 gal (US)
Grease Tank 90 lb
Note (1) DEF Tank only available for U.S. EPA Tier 4 Final / EU Stage V engine option
AC Drive System
Total Reduction Ratio 35:01:00
Top Speed - Loaded 40 mile/h
Generator/Alternator Brushless, engine mounted, dual bearing
Controls IGBT Inverter Technology, air cooled, pressurized cabinet with filtration
Wheel Motor Cat high-torque AC induction, rear axle mounted
Cooling System Cat variable speed, hydraulically driven cooling system
Braking System
Service Brakes Four-Corner, Wet Disc, Oil Cooled, Hydraulically Actuated
Front Wet Disc Brake Surface Area 22642 in²
Rear - Wet Disc Brake Surface Area 32730 in²
Standards Service and Secondary: ISO 3450:2011
Electric Retarding Radial Grid Design
Dynamic Retarding Power - Continuous 5480 HP
Parking Brakes Four-corner, Multi-disc, Spring Applied, Hydraulically Released
Load Brake Rear service brakes
Note Anti-Lock Brake System (ABS) optional with CMD package
Weight Distributions - Approximate
Front Axle - Empty 47 %
Rear Axle - Empty 53 %
Front Axle - Loaded 33 %
Rear Axle - Loaded 67 %
Note Weight distributions optimized with Cat body.
Capacity - HE Body - 100% fill factor
Struck 129-200 m³ (168-261 yd³)
Heaped (SAE 2:1) 218-276 m³ (285-361 yd³)
Note Contact your local Cat dealer for body recommendations.
Body Hoists
Type Twin, two-stage hydraulic cylinders with snubbing valve.
Pump Flow - High Idle 257.3 gal/min
Relief Valve Setting - Raise 3029 psi
Body Raise Time - High Idle 21 s
Body Lower Time - Float 22 s
Body Power Down- High Idle 17.5 s
Note (1) Twin, two-stage hydraulic cylinders mounted outside main frame; double-acting cylinders in both stages.
Note (2) Power raise in both stages; power down capability in both stages.
Note (3) Automatic body-lower modulation reduces impact on frame.
Type Self-contained nitrogen/oil cylinders, pin-to-pin mounting, top & bottom double shear clevis attachments
Effective Cylinder Stroke - Front 10 in
Effective Cylinder Stroke - Rear 5 in
Air Conditioning HFC - 134A refrigerant: 21,600 Btu/h
Heater / Defroster 24600 Btu/h
Note Ambient capabilities down to -15C (5F) for heater/defroster and up to 50C (122F) for air conditioning.
ROPS Standards (1) ROPS (Rollover Protective Structure) meets ISO 3471:2008 for Operator and ISO 13459:2012 for Trainer.
FOPS Standards FOPS (Falling Objects Protective Structure) meets ISO 3449:2005 Level II for Operator and ISO 13459:2012 Level II for Trainer.
Dimensions (Approximate)
Height - Top of ROPS 22.1 ft
Overall Length 51.44 ft
Wheel Base 21.9 ft
Rear Axle - Tail 16.07 ft
Dump Clearance - Empty 5.72 ft
Loading Height - Empty 25.54 ft
Overall Height - Body Raised 48.85 ft
Centerline Front Tire Width 23.06 ft
Front Axle Clearance - Loaded 2.81 ft
Overall Canopy Width (with rock deflectors) 33.15 ft
Outside Body/Canopy Width (without rock deflectors) 31.62 ft
Inside Body Width 29.44 ft
Front Canopy Height - Empty 26.01 ft
Rear Axle Clearance - Loaded 2.8 ft
Centerline of Rear Dual Tire Width 19.5 ft
Overall Tire Width - Empty 30.27 ft
Overall Length (High Altitude only) 51.87 ft
Note Dimensions listed includes canopy deflectors
Engine - High Altitude Only
Engine Model Cat® C175-20
Gross Power SAE J1995:2014 4150 HP
Net Power - SAE J1349:2011 4000 HP
Rated Speed 1750 r/min
Emissions Rating Fuel Optimized
Bore 6.9 in
Stroke 8.7 in
Displacement 6469 in³
Note 1 Net Power advertised is the power available at the flywheel when the engine is equipped with air intake system, exhaust system, and alternator.
Note 2 Additional fuel optimized selectable power rating: 2983 kW / 4,000 hp
Rims 44" x 63" Rims
Standard Tires 59/80 R63
Note (1) Quick Change Rims optional.
Note (2) Caterpillar recommends the customer evaluate all job conditions and consult tire manufacturer for proper tire selection and TKPH (TMPH) capabilities.
Sound Standards The operator sound pressure level, 75 dB(A), measured according to ISO 6394:2008 and ISO 6396:2008.


  • Greater visibility thanks to wide field of view from the cab and radial retard grid that improves right-hand view.
  • Safer access and egress with 600-mm-wide (23.6-in-wide) ladders, flat deck, toe kicks, and optional power access stair attachment.
  • Confidence-building features such as anti-rollback, traction controls, reverse shift inhibitor, Automatic Retarding Control, and door sensor warning for park brake application.
  • Full dynamic retarding through a compact radial grid, backstopped by the proven design of Caterpillar four-corner oil-cooled brakes, for stable handling and confident stopping.
  • Fully independent secondary brake system that provides emergency controllability with a hydraulically actuated secondary brake pedal that serves as a backup to electronic controls.


  • The most efficient electric drive truck in its size class — moving more tonnes per liter (tons per gallon) and hauling more material faster—so you can move more over the course of a shift, or haul the same amount of material with fewer trucks.
  • Available with higher horsepower to boost productivity in deeper pits, plus electronically-selectable lower horsepower settings that allow the 798 to better align with mixed fleets.
  • Ease of operation and reduced costs thanks to deep integration of Cat engine, AC drive system, hydraulics and controls.
  • End-to-end visibility of all truck parameters for optimized fuel efficiency, speed on grade and parasitic loads across the operating range.
  • Excellent slow speed control within service areas as well as superior motor torque and acceleration pulling away from the shovel.


  • Ergonomic cab layout, excellent all-around visibility, and controls, levers and switches that are positioned for ease of use.
  • Automatic climate control and reduced vibration and sound.
  • Next generation seat with height adjuster, adjustable shoulder stock to keep the seatbelt from rubbing, and seat back, side and lumbar bolsters to increase stability.


  • High displacement, low rpm rating and conservative horsepower ratings, which mean more time on the haul road and less time in the shop.
  • Inlet manifolds and turbochargers that are located outside of the engine's V, giving the service technicians more space to work on top of the engine and within the engine bay.
  • Sealed and pressurized inverter cabinet that requires no cleaning, eliminating hundreds of hours of maintenance over the life of the truck/
  • Engine walkways and service platforms, modular components, service-friendly layout and ground-level grouped service points.
  • Extended oil change interval (up to three times) with standard engine equipment including Centrifugal Oil Filter (COF) and Self-Cleaning Filter (SCF).


  • First overhaul life of 25,000 hours for lower cost of ownership, with proven C175 engine and electric drive system.
  • Highly validated and proven straight frame rail design that eliminates the bends and breaks that can occur at stress concentrations.
  • Outstanding durability delivered by box section construction that uses Caterpillar proprietary steel specification for excellent welding characteristics.
  • Increased frame life thanks to deep section main rails in critical areas of the frame lower stress levels.
  • Frame, powertrain, engine and components that are built to be rebuilt — delivering multiple lives of like-new performance at a fraction-of-new price.


  • High voltage system that operates at lower current than most competitive trucks, contributing to higher efficiency, lower heat generation, smaller and lighter components, and longer component life.
  • Radial style retarding grid with AC electric motor that requires no regular motor maintenance and is quieter and lighter than box grids.
  • State-of-the-art high voltage IGBTs for maximum AC drive system efficiency, and a dual-bearing brushless alternator that delivers long life and less maintenance, with no shimming required.
  • AC Drive dynamic retarding for continuous retarding power; AC electric motor that reduces maintenance; and state-of-the-art high voltage IGBTs for maximum AC drive system efficiency.
  • Variable hydraulic blower fan, which provides optimized cooling even at idle for increased component performance and life.


  • Designed to use less fuel, which reduces engine emissions and carbon footprint.
  • Optional U.S. EPA Tier 4 Final / EU Stage V engine, which reduces NOx by 62% and particulates by 93% when compared to Tier 1 emissions.
  • Reduced waste thanks to Centrifugal Oil Filter (COF), standard self-cleaning engine filter, extended oil change intervals and reduced oil usage.
  • Engines compatible with diesel fuel blended with lower-carbon intensity fuels such as biofuels and renewable fuels, plus power options like trolley.
  • Cat Rebuild and Cat Reman programs, which preserve raw materials, conserve energy and reduce emissions.


  • Equipped with standard Product Link™ Elite monitoring system, which delivers health and payload information to keep performance high and enable proactive maintenance planning.
  • Factory-ready for fully integrated Cat MineStar™ Command for hauling, an autonomous hauling solution proven to increase productivity up to 30%.
  • Optional MineStar Fleet, a fleet monitoring system, to measure, manage and maximize the overall hauling operation.
  • Optional MineStar Detect proximity detection system, which uses cameras to give operators a better view of what's happening around their equipment.
  • Optional in-cab Cat Driver Safety System (DSS) intervenes when operator fatigue or distraction are detected.


  • Bodies designed to fit with the chassis, sized to meet payload requirements and work as part of the truck system.
  • High Efficiency (HE) dump body option that is lightweight, simplified and durable.
  • With unique minimal structure design, HE body provides long life while minimizing weight for increased payload.
  • HE body sized and configured to meet the specific needs of the mine, dictated by fragmentation, abrasion, cohesion and the loading tool.

Standard Equipment:

  • Power Train
    • Cat® C175-16 Diesel Engine: 2610 kW (3,500 hp) Fuel Optimized , U.S. EPA Tier 2 equivalent (available for applicable markets)
    • Cat® C175-16 Diesel Engine: 2610 kW (3,500 hp) U.S. EPA Tier 4 Final / EU Stage V (available for applicable markets)
    • C175-16 Diesel Engine
      – Turbocharging (4) / Aftercooled (ATAAC)
      – Centrifugal oil filter
      – Self-cleaning oil filter
      – Charging Alternator (225 amp), brushless
      – Pre-lubrication/engine
      – Air cleaner with precleaner (4)
      – Multi-point oil pressure sensing
      – Exhaust - Muffler, Right Side Exit
    • Cat C175-20 Diesel Engine (High Altitude Only)
      - 3095 kW (4,150 hp) Fuel Optimized (available for applicable markets)
      - Centrifugal oil filter
      - Self-cleaning oil filter
      - Charging Alternator (225 amp), brushless
      - Pre-lubrication/engine
      - Air cleaner with precleaner (4)
      - Multi-point oil pressure sensing
      - Exhaust - Muffler, Right Side Exit
    • Braking system:
      – Electric dynamic retarding with blended low speed
      – Oil-cooled, Multi-disc (front and rear) - Service, Parking, Secondary
      – Load Brake (rear axle only)
      – Extended Life Brake Disc Material
      – Automatic Retarder Control (ARC)
      – Brake Release Motor (towing)
    • Cat® AC Drivetrain:
      – AC generator
      – AC induction motors (high-torque)
      – IGBT motor control
      – Radial retarding grid with AC motor control
      – Programmable top speed
      – TorqueBoost technology
      – Traction control system
    • Directional Shift Management:
      – Body-up reverse neutralizer
      – Body-up shift inhibitor
      – Reverse shift inhibitor
      – Neutral coast inhibitor
      – Neutral start inhibitor
    • Additional Features:
      – Rear axle continuous lubrication and filtration
      – Rear axle continuous oil cooling
  • Operation And Controls
    • Integrated ROPS/FOPS cab, insulated/sound suppressed
    • Seat, operator, air suspension, adjustable, heated/cooled
    • Seatbelt, operator, three point
    • Seat, trainer, air suspension, adjustable
    • Seatbelt, trainer, two point
    • Steering wheel, tilt, telescopic, horn
    • Horn, electric
    • Directional shift lever
    • Single Pedal Retarding & oil-cooled brake control
    • Automatic Retard Control (ARC) toggle switch
    • Load brake switch
    • Windshield with tinted/safety glass
    • Window, electric powered, operator/passenger
    • Windshield Wipers (2), intermittent control and washer
    • Visor (2)
    • Storage rear of seats
    • Cup holder (2)
    • Dome courtesy light
    • Entertainment radio ready with speakers and wiring harnesses
    • Converter, 12V
    • 12V DC power supply (1)
    • Mirrors, standard (Left-Flat, Right-Convex)
    • Fixed access ladder, left hand ground access
    • Fixed access ladder, right hand round access (High Altitude Only)
    • HVAC:
      – Pressurized, filtered environment
      – Air conditioner
      – Heater/defroster
    • Metric or English gauges:
      – Speedometer
      – Tachometer
      – Electric hour meter
      – Fuel level
      – DEF level (U.S. EPA Tier 4 Final / EU Stage V engines only)
      – Hydraulic oil temperature
      – Engine coolant temperature
    • Service & Information:
      – Diagnostic connection port
      – Electric engine control fault indicator
      – Alarm, Park brake / open operator door
      – Third party telematics port
      – VIMS message center advisor
  • Electrical
    • Audible Alarm, backup
    • Electrical system, 24V with fuses and breakers
    • Batteries, 12V (8) 90 amp hour
    • Ground level Battery charge receptacle
    • Lighting, signals/service:
      – Headlights (4 low beam, 4 high beam), LED
      – Headlights (4 low beam, 2 high beam), LED (High Altitude only)
      – Backup and marker/hazard, LED
      – Directional signals (front and rear), LED
      – Front stair access/service deck, LED
      – Stop/tail lights, LED
      – Engine compartment, LED
      – Inverter energy warning lights, LED
    • Payload indicator, red/green
    • Payload, digital display
  • Additional Features And Equipment
    • Accumulators (Steering & Brake) – Australian and Canadian certified
    • Automatic lubrication system
    • Rotating component guards
    • Mud Flaps
    • Tow hooks and pins (front)
    • Tow pin (rear) (empty truck only)
    • 44 x 63 rims, six position (6)
    • Fueling:
      – 4922 L (1,300 gal) fuel tank (Fuel optimized engines only)
      – 4543 L (1,200 gal) fuel tank (U.S. EPA Tier 4 Final / EU Stage V engines only)
      – 379 L (100 gallon) DEF tank (U.S. EPA Tier 4 Final / EU Stage V engines only)
      – Fuel filter with water separator
      – 210 GPM Fast fill fuel system (Left and Right)
    • Service:
      – Engine service platforms (2)
      – ANSI or ISO service instructions
      – SOS℠ sample points (hydraulic oil, engine coolant, engine oil)
      – Ground level machine lockout (battery)
      – Ground level engine shut-down
      – Drivetrain lockout
      – Drivetrain lockout at ground level (High Altitude only)
      – Engine start lockout
      – Auxiliary "buddy" dumping quick connect
      – Auxiliary steering quick connect (towing)
  • Cat® Technology Products
    • Cat® MineStar Detect (Radar and Camera) System
    • Cat® Product Link Elite (Cellular)
  • Dump Body
    • High Efficiency (HE) body, 218-276 m³ (285-361 yd³)
      – HE Body Mounting Group
      – Rock ejectors (chain)
  • Antifreeze
    • Cat Extended Life Coolant (ELC) protects to –35° C (–30° F)

Optional Equipment:

  • Power Train
    • Cat® C175-16 Diesel Engine: 2312 kW (3,100 hp) power setting (Fuel optimized / U.S. EPA Tier 2 equiv. engines only)
    • Cat C175-20 Diesel Engine (High Alititude only): 2983 kW (4,000 hp) power setting, Fuel Optimized (available for applicable markets)
    • Body heat exhaust
  • Operation And Controls
    • Throttle lock
    • Timer, engine shutdown
    • Heated mirrors (Left and Right)
    • Powered access ladder, left hand ground access
    • Language monitors: English, Spanish, Italian, Portuguese, Dutch, Norwegian, Swedish, Estonian, Latin, Lithuanian, Slovakian, Slovenian, Greek, Romanian, Russian, Polish, Czech, Hungarian, Icelandic, Finnish, Danish, Thai, Indonesian, Vietnam, Malaysian, Chinese
  • Operations And Controls
    • Powered access ladder, right hand ground access (High Altitude only)
  • Electrical
    • Lighting, signals/service:
      – Fog lights, LED
      – Work lights, LED
      – Side profile lights, LED
      – Dump body marker/stop lights, LED
    • Retarding indicator light, multi-color, cab exterior
    • Payload, digital display
  • Additional Features And Equipment
    • Fueling: 300 GPM Fast fill fuel system (Left and Right)
    • Portable fire extinguisher
    • Front bumper single-point center tow
    • Wheel chocks (ANSI and ISO)
    • 44 x 63 rims, quick change (2 quick change, 4 standard)
    • Service:
      – Inverter platform (rear access)
      – Service Center, fast-fill
  • Cat® Technology Products
    • Cat® MineStar Detect (Camera Only) System
    • Cat® Product Link Elite (Satellite)
    • Cat® MineStar Health
    • Cat® MineStar Fleet
    • Cat® MineStar Terrain
    • Cat® MineStar Command-Ready
    • Cat® MineStar Command
    • Cat® Trolley Assist Attachment
  • Dump Body
    • HE rock box liner
    • HE canopy rock deflectors
    • HE rear tire rock deflectors
    • HE impact liner
    • Chain and solid bar
    • Canopy Extension
  • Antifreeze
    • Antifreeze/coolant protects to –50° C (–58° F)

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