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R2900G Underground Mining Loader

The R2900G underground loader is designed for high production, low cost-per-ton loading and tramming in underground mining applications. Compact design with agile performance, rugged construction and simplified maintenance ensures excellent productivity, long life and low operating costs. Engineered for performance, designed for comfort, built to last.


Engine Model

Cat® C15

Engine Power - VR Engine - ISO 14396:2002








Rated Power


Engine Power - Tier 3 Engine - ISO 14396:2002


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 specificat

Note (4)

Optional Ventilation Reduction Package available.

Note (1)

Power ratings apply at a rated speed of 1,800 rpm when tested under the reference conditions for the specified standard.

Note (3)

No engine derating required up to 591 m (1,938 ft) altitude.

Note (5)

Optional Tier 3 engine package emits equivalent to U.S. EPA Tier 3 and EU Stage IIIA.

Operating Specifications

Rated Payload


Gross Machine Mass


Static Tipping Load - Straight Ahead - Lift Arms Horizontal


Static Tipping Load - Full Turn - Lift Arms Horizontal


Breakout Force - SAE


Hydraulic Cycle Times





Lower, Empty, Float Down


Total Cycle Time


Turning Dimensions

Axle Oscillation

Articulation Angle


Outside Clearance Radius


Inner Clearance Radius



Forward - 1


Forward - 2


Forward - 3


Forward - 4


Reverse - 1


Reverse - 2


Reverse - 3


Reverse - 4



Tire Size

29.5 × 29

Service Refill Capacities

Rear Differential and Final Drives - With Axle Oil Cooling System

44.1gal (US)

Front Differential and Final Drives - With Axle Oil Cooling System

42gal (US)

Engine Crankcase

9gal (US)

Front Differential and Final Drives

31.4gal (US)


16.4gal (US)

Hydraulic Tank

37gal (US)

Rear Differential and Final Drives

33.5gal (US)

Fuel Tank - Dual

376.4gal (US)

Cooling System

19.8gal (US)



*Calculated Weight.

Operating Mass + Rated Payload* - Rear Axle


Operating Mass*


Operating Mass + Rated Payload* - Front Axle


Operating Mass* - Front Axle


Operating Mass + Rated Payload*


Operating Mass* - Rear Axle



Cab - FOPS

ISO 3449, SAE J231, AS2294.3, EN13627


ISO 3450, AS2958.1, CAN-CSA424.30-M90

Cab - ROPS

ISO 3471, SAE J1040, AS2294.2, EN13510

Bucket Capacities

Dump Bucket - 4


Dump Bucket - 2


Dump Bucket - 3


Dump Bucket - 1


Standard Equipment:

  • Electrical
    • 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
  • Operator Environment
    • 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
  • Power Train
    • 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
  • Other Standard Equipment
    • 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, Rims, And Wheels
    • 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:

  • Electrical
    • Battery disconnect switch, in cab
    • Lighting:
      – Cat LED work lights
      – Truck loading light
  • Operator Environment
    • 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
  • Technology Products
    • 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.
  • Tires, Rims, And Wheels
    • Rim identification numbering
    • Spare rim (tubeless)
  • Power Train
    • 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
  • Other Optional Equipment
    • 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:
      – Ansul, dry powder
      – 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

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