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The Cat® R2900G underground loader is designed for high-production, low cost-per-ton loading and tramming in underground mining applications. An operator favorite, it delivers a safe, comfortable ride in a cab equipped with easy-to-use controls and efficiency-boosting features that optimize performance and maximize productivity. Its compact design provides agile performance combined with rugged construction and simplified maintenance to ensure excellent productivity, long life and low operating costs.

Engine Model Cat® C15
Engine Power - Tier 3 Engine - ISO 14396:2002 299 kW
Nominal Payload Capacity 17200 kg

Technicial Specifications

Engine Model Cat® C15
Engine Power - Tier 3 Engine - ISO 14396:2002 299 kW
Engine Power - VR Engine - ISO 14396:2002 299 kW
Bore 137.2 mm
Stroke 171.5 mm
Displacement 15.2 l
Note (1) Power ratings apply at a rated speed of 1,800 rpm when tested under the reference conditions for the specified standard.
Note (2) All rating conditions are based on ISO/TR14396:2002, inlet air standard conditions with a total barometric pressure of 100 kPa (29.5 in Hg), with a vapor pressure of 1 kPa (0.295 in Hg), and 25° C (77° F). Performance measured using fuel to EPA specifications in 40 CFR Part 1065 and EU specifications in Directive 97/68/EC with a density of 0.845-0.850 kg/L @ 15° C (7.05-7.09 lb/gal @ 59° F) and fuel inlet temperature 40° C (104° F).
Note (3) No engine derating required up to 591 m (1,938 ft) altitude.
Note (4) Optional Ventilation Reduction Package available.
Note (5) Optional Tier 3 engine package emits equivalent to U.S. EPA Tier 3 and EU Stage IIIA.
Operating Specifications
Nominal Payload Capacity 17200 kg
Gross Machine Mass 70350 kg
Static Tipping Load - Straight Ahead - Lift Arms Horizontal 39923 kg
Static Tipping Load - Full Turn - Lift Arms Horizontal 34069 kg
Breakout Force - SAE 27346 kg
Bucket Capacities
Bucket Capacity 6.3-8.9 m³ (8.2-11.6 yd³)
Dump Bucket - 1 6.3 m³
Dump Bucket - 2 7.2 m³
Dump Bucket - 3 8.3 m³
Dump Bucket - 4 8.9 m³
Operating Mass* 50209 kg
Operating Mass* - Front Axle 23057 kg
Operating Mass* - Rear Axle 27152 kg
Operating Mass + Rated Payload* 67409 kg
Operating Mass + Rated Payload* - Front Axle 50220 kg
Operating Mass + Rated Payload* - Rear Axle 17189 kg
Note *Calculated Weight.
Service Refill Capacities
Engine Crankcase 34 l
Transmission 62 l
Hydraulic Tank 140 l
Cooling System 75 l
Front Differential and Final Drives 119 l
Rear Differential and Final Drives 127 l
Front Differential and Final Drives - With Axle Oil Cooling System 159 l
Rear Differential and Final Drives - With Axle Oil Cooling System 167 l
Fuel Tank - Dual 1425 l
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
Hydraulic Cycle Times
Raise 9.2 s
Dump 3.4 s
Lower, Empty, Float Down 3.1 s
Total Cycle Time 15.7 s
Turning Dimensions
Outside Clearance Radius 7323 mm
Inner Clearance Radius 3383 mm
Axle Oscillation
Articulation Angle 42.5°
Forward - 1 5.4 km/h
Forward - 2 9.7 km/h
Forward - 3 17.3 km/h
Forward - 4 29.8 km/h
Reverse - 1 6.6 km/h
Reverse - 2 11.8 km/h
Reverse - 3 21 km/h
Reverse - 4 35.5 km/h
Tire Size 29.5 × 29

Advantages and Features


  • Large window openings to offer excellent visibility in all directions.
  • Safer access and egress with anti-skid upper deck surfaces and 3-point access to cab and machine.
  • Four corner oil-cooled braking system that provides excellent control, with service brake system actuated by hydraulic pressure and parking brake function that is spring applied and hydraulic released to ensure braking in the event of loss of hydraulic failure.
  • Operator Present System, which protects the machine and operator from uncontrolled machine movements, with hydraulic system neutralization and door sensor.
  • Safer service with service area located on cold side of engine, bucket control group safety pins, articulation lock and hinged belly guards.


  • Optional enclosed design provides fresh, pressurized, temperature-controlled air circulation with air conditioning.
  • Optional sound-suppressed ROPS cab for a quiet, secure working environment.
  • Controls, levers, switches and gauges positioned to maximize productivity and minimize fatigue.
  • Low-effort, pilot-operated joystick implement control with simultaneous lift and tilt functions to optimize operating efficiency.
  • Four corner oil-cooled braking system, which provides excellent control.


  • Loadrite Payload Control System, which gives the operator accurate, real-time updates on payload weights to help them reach maximum bucket capacities while reducing overloading.
  • Increased operator efficiency and optimized performance thanks to electronic auto shift transmission that allows operator to choose between manual or auto shift modes.
  • Transmission neutralizer that makes it possible for the operator to engage the service brakes and neutralize the transmission, maintaining high engine rpm for full hydraulic flow, enhancing digging and loading functions.
  • Fast cycle times thanks to optional ride control system, which gives operators confidence to travel at speeds above 5 km/h (3 mph) during load and carry operations.
  • Productivity-boosting hydraulic system, which delivers exceptional digging and lifting forces for fast cycle times, plus high hydraulic flow rates that provide fast response and powerful lift forces.


  • Cat C15 ACERT engine, which provides unequalled lugging force while digging, tramming and traversing steep grades.
  • Torque rise that effectively matches transmission shift points for maximum efficiency and fast cycle times.
  • Torque Converter Lockup Clutch that combines maximum rimpull while in torque converter drive with the efficiency and performance of direct drive when the lockup clutch is engaged.
  • Mechanically Actuated, Electronic Unit Injection (MEUI™) high-pressure, direct injection fuel system, which electronically monitors operator demands and sensor inputs to optimize engine performance and fuel combustion.
  • Cat four-speed planetary power shift transmission matched with the Cat C15 diesel engine to deliver constant power over a wide range of operating speeds.


  • Four dump bucket sizes that deliver unmatched productivity and structural reliability, featuring two types of cast corners to help strengthen the side plate to bucket lip joint and allow for various cutting edges.
  • Three types of Ground Engaging Tools (GET) available: modular weld-on, which deliver welded part reliability; Bolt-On-Half-Arrow (BOHA), which offer more wear material and feature a bolt-on design that enables fast and easy removal and replacement; and the Durilock Lip Shroud system, featuring hammerless installation and maintenance-free retention of GET, with three interchangeable shroud styles.
  • Cat Bucket Pro App, which provides real-time data on GET performance to help you plan maintenance, manage inventory and know cost-per-ton.


  • Frame engineered to withstand extreme forces generated during loading and tramming cycles, with deep penetration and consistent welds throughout to ensure structures are solidly fused to provide sturdy platform for the linkage and the axles.
  • Proven planetary power shift transmission built for long life between overhauls.
  • Spread hitch design that widens the distance between upper and lower hitch plates to distribute forces and increase bearing life.
  • Field-proven Cat high pressure XT hydraulic hoses that are exceptionally strong and flexible for maximum system reliability and long life in the most demanding conditions.
  • Frame, powertrain, engine and components that are built to be rebuilt, delivering second and third lives.


  • Easy access to daily service points to simplify servicing and reduce time spent on regular maintenance procedures.
  • Ground-level access to all tanks, filters, lubrication points and compartment drains, with engine oil and fuel filters installed on cold side of engine, plus fluid-level sight gauges.
  • Radial seal air filters that are easy to change, reducing time required for air filter maintenance.
  • Sealed, colleted pins fitted to all major bucket and lift arm hinge points for longer pin and bushing life, which reduces maintenance costs and extends service intervals.
  • Electrical connectors that are sealed to lock out dust and moisture, harnesses that are covered for protection, and wires that are color- and number-coded for easy diagnosis and repair.


  • Cat Electronic Monitoring System (EMS) that provides continuous access to critical machine data to keep the machine performing at a high level.
  • Cat Electronic Technician (ET), which enables quick electronic diagnosis of machine performance and key diagnostic data for effective maintenance and repairs.
  • VIMS (Vital Information Management System) GEN3, which combines Health Information Monitoring and VIMS capability in one ECM to monitor vital machine health functions; logs data to help identify areas for improvement in repair planning, operator training, site planning, machine health and personnel performance.
  • Factory-ready for remote operation and can be equipped with the industry-proven Cat® MineStar™ Command for underground autonomous solution and machine health monitoring offerings.


  • Optional EU Stage III and U.S. EPA Tier 3 compliant engine available.
  • Optional Ventilation Reduction (VR) Package, which incorporates selective engine hardware and software to reduce diesel particulate matter in the engine exhaust and deliver a significant ventilation rate reduction, a decrease in fuel consumption, and maintained or improved product performance.
  • Cat Diesel Particulate Filter, which complements the VR engine by further reducing particulate matter in the exhaust.
  • Ongoing research and development into engine compatibility with diesel fuel blended with lower-carbon intensity fuels such as biofuels and renewable fuels, plus power options like electrification.
  • Cat Rebuild and Cat Reman programs, which preserve raw materials, conserve energy and reduce emissions, plus retrofits and upgrades for older machines to incorporate efficiency improvements and emission reductions.

Standard Equipment

    • Engine shutdown switch
    • Lighting: Bucket lip
      – External, front, rear, stop light, dual halogen
    • Receptacle Group, auxiliary start
    • Starter, electric, 24-volt
    • Starting and charging system
    • Alarm, reversing
    • Alternator, 95 amp
    • Battery disconnect switch, ground level
    • Batteries, low maintenance
    • Diagnostic connector
    • Automatic Brake Application (ABA)
    • Cab:
      – Cab, open, ROPS/FOPS
    • Caterpillar Electronic Monitoring System (CEMS), dash instrumental panels
    • Horns, electric
    • Instrumentation/gauges:
      – Speedometer/tachometer
      – Fuel level
      – Hydraulic oil temperature
      – Engine coolant temperature
    • Operator presence system
    • Light, warning, residual brake
    • Mounting, ROPS
    • Pilot hydraulic implement controls (single joystick)
    • Seat:
      – Seat, suspension, vinyl
    • Seat belt, retractable
    • Brakes, full hydraulic enclosed wet multiple-disc (SAFR)
    • Engine:
      – Cat C15 six cylinder diesel
      – Air-to-air aftercooler (ATAAC)
    • Exhaust:
      – Exhaust, purifier, muffler
    • Filter, engine, remote mounted
    • Fuel adapters:
      – Standard fill, dual, rubber coated, double steel braided fuel lines
    • Fuel priming pump
    • Park Brake Switch Engagement (choose between):
      – Push to Apply
      – Pull to Apply
    • Pre-cleaner, engine air intake
    • Torque converter, lock-up clutch (LUC)
    • Transmission:
      – Electronic Clutch Pressure Control (ECPC)
      – Auto planetary powershift (4F/4R)
      – Transmission neutralizer
    • Brake axle cooling
    • Cap, radiator, manual release
    • Catalytic exhaust purifier/muffler
    • Dump bucket
    • Bucket lip:
      – Lip weldings – full weld edge or tack weld edge and corners
    • Decals, International Picto Graphics
    • Fenders, front, rear
    • Firewall
    • Guards, engine and transmission
    • Handholds
    • Lift arm positioner for return to dig
    • Radiator grill, swing out
    • Service oil sample
    • Valve, drain, transmission oil filter
    • Valve, hydraulic, standard
    • Windows:
      – Single pane
    • Tires arrangements: tires must be selected from the Mandatory Attachments section, choose between:
      – Tire, 29.5 × R29 VSMS 2 Bridgestone
      – Tire, 29.5 × R29 VSDL L5 Bridgestone
    • Rims (set of four): five piece, tubeless

Optional Equipment

    • Battery disconnect switch, in cab
    • Lighting:
      – Cat LED work lights
      – Truck loading light
    • Cab:
      – Cab, enclosed, ROPS/FOPS
    • Camera, color rear facing
    • Duct, air, flow diverter
    • Idle timer (enclosed cab)
    • Instrumentation/gauges:
      – Brake pressure
    • Seat:
      – Seat, suspension, tee, vinyl
      – Seat, suspension, air, vinyl
      – Seat covers, tee, air and standard
    • Command for Underground*
    • Vital Information Management System (VIMS) Gen 3
    • Payload system, Loadrite
    • Remote Control Interface (excludes transmitter and receiver) – RCT
    • Note: *Please consult with your Regional Commercial or Technology Representative prior to upgrading your machine to Command for Underground.
    • Rim identification numbering
    • Spare rim (tubeless)
    • Exhaust:
      – Particulate filter, Flow Thru
      – Particulate filter, Wall Flow
    • Fuel adapters:
      – Standard fill, dual, stainless steel covered, single braided fuel lines
      – Fast fill, dual, rubber coated, double steel braided fuel lines
      – Fast fill, dual, stainless steel covered, single braided fuel lines
    • Secondary Steering System
    • Engine Options:
      – Engine, Ventilation Reduction (VR)
      – VR engine, Flow Thru Ready
      – Engine, Tier 3
    • Brake Release Arrangements:
      – Recovery hook
      – Recovery bar
    • Buckets:
      – Various sizes, dump (6.3 m3/8.2 yd3 to 8.9 m3/11.6 yd3)
      – Light materials, dump, uninstalled (10.5 m3/13.7 yd3, 11.6 m3/15.2 yd3)
    • Bucket lip:
      – Modular weld-on
      – Bolt-on lips
      – Durilock™
    • Ground Engaging Tools:
      – Cutting edge, Cat weld-on
      – Cutting edge, bolt-on half arrow
      – Cutting edge, shrouds, Durilock
      – MAWPS – bucket lip protection
      – Heel shrouds
      – Wear bars
      – Liners
      – Overflow guard
    • Faster fill and evacuation systems:
      – Engine, Fast Fill
      – Radiator, Fast Fill
      – Hydraulic, Fast Fill
      – Transmission, Fast Fill
    • Draw bar attachment, bolt-on
    • Fire Suppression System:
      – Foam, water based
    • Fluids:
      – Arctic coolant
      – Arctic fuel
    • Guard, light and window
    • Handrails
    • Lubrication System:
      – Automatic
      – Centralized
    • Mine Transfer
    • Reversible steering
    • Reflective tape
    • Ride Control System
    • Service tools:
      – Collet jacking bolts
      – Recovery bar
    • Vandalism protection
    • Windows
      – Dual pane
    • Wear protection bars:
      – Cab/ROPS
      – Hydraulic tank
      – Radiator