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Engine ModelCat® 3306B DITA
Rated Payload14991 lb (6800 kg)
Bore4.75 in (120.7 mm)
Stroke6 in (152.4 mm)
The R1300G 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 ModelCat® 3306B DITA
Rated Payload14991 lb (6800 kg)
Bore4.75 in (120.7 mm)
Stroke6 in (152.4 mm)
Displacement640.75 in³ (10.5 l)
Note (1)Power ratings apply at a rated speed of 2,200 rpm when tested under the reference conditions for the specified standard.
Note (2)Ratings based on SAE J1995 standard air conditions of 25° C (77° F) and 100 kPa (29.61 inHg) barometer. Power based on fuel having API gravity of 35 at 16° C (60° F) and an LHV of 42 780 kJ/kg (18,390 BTU/lb) when engine used at 30° C (86° F).
Note (3)Engine derate will commence at an altitude of 4500 m (14,763.7 ft).
Gross Machine Mass65482 lb (29702 kg)
Static Tipping Load - Straight Ahead - Lift Arms Horizontal45360 lb (20575 kg)
Static Tipping Load - Full Turn - Lift Arms Horizontal39397 lb (17870 kg)
Breakout Force - SAE26504 lb (12020 kg)
Operating Mass*45691 lb (20725 kg)
Operating Mass* - Front Axle16810 lb (7625 kg)
Operating Mass* - Rear Axle28881 lb (13100 kg)
Operating Mass + Rated Payload*60682 lb (27525 kg)
Operating Mass + Rated Payload* - Front Axle41105 lb (18645 kg)
Operating Mass + Rated Payload* - Rear Axle19577 lb (8880 kg)
Note*Calculated weights.
Forward - 12.8 mile/h (4.5 km/h)
Forward - 24.8 mile/h (7.8 km/h)
Forward - 39.3 mile/h (15 km/h)
Forward - 416.3 mile/h (26.3 km/h)
Reverse - 12.8 mile/h (4.5 km/h)
Reverse - 24.8 mile/h (7.8 km/h)
Reverse - 39.2 mile/h (14.8 km/h)
Reverse - 414.3 mile/h (23 km/h)
Raise5 s (5 s)
Dump2 s (2 s)
Lower, Empty, Float Down2.3 s (2.3 s)
Total Cycle Time9.3 s (9.3 s)
Dump Bucket - 13.2 yd³ (2.5 m³)
Dump Bucket - 23.7 yd³ (2.8 m³)
Dump Bucket - 3 - Standard Bucket4.1 yd³ (3.1 m³)
Dump Bucket - 44.4 yd³ (3.4 m³)
Ejector Bucket3.1 yd³ (2.4 m³)
Outside Clearance Radius225.1 in (5717 mm)
Inner Clearance Radius111.2 in (2825 mm)
Axle Oscillation10°
Articulation Angle42.5°
Tire Size17.5 × R25
Engine Crankcase - With Filter6.6 gal (US) (25 l)
Transmission11.9 gal (US) (45 l)
Hydraulic Tank23.2 gal (US) (88 l)
Cooling System17.7 gal (US) (67 l)
Front Differential and Final Drives10 gal (US) (38 l)
Rear Differential and Final Drives11.1 gal (US) (42 l)
Fuel Tank77.9 gal (US) (295 l)
StandardsROPS/FOPS Certified Cab

Benefits and Features


The Cat 3306B is a proven engine that delivers reliability and durability. The efficient and powerful engine delivers maximum loading and tramming performance in the most demanding mining applications. Complete system integration of the engine and transmission ensures fuel efficiency and smooth operation.

High Torque Rise

Provides unequalled lugging force while digging, tramming and traversing steep grades. Torque rise effectively matches transmission shift points for maximum efficiency and fast cycle times.


Modular radiator with swing-out grill provides easy access for cleaning or repair. Built in sight gauge allows for quick, safe coolant level checks.


Oil cooled pistons increase heat dissipation and promote longer piston life.

Full-length Water-cooler

Full-length water-cooled cylinder liners provide maximum heat transfer.

Turbocharged and Aftercooled

Jacket water aftercooling provides improved fuel economy by packing cooler, denser air into cylinders for more complete combustion of fuel and lower emissions. The turbocharger enhances performance and efficiency.

Fuel Injection

The high pressure direct injection fuel system provides excellent fuel atomization for unmatched reliability and durability.


The crankshaft is forged and induction hardened for long-term durability.

Power Shift Transmission

The Cat four-speed planetary power shift transmission is matched with the Cat 3306B diesel engine 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.

Torque Converter

High capacity torque converter delivers more power to the wheels for superior power train efficiency.

Electronic Auto Shift Transmission

The electronic auto shift transmission increases operator efficiencies and optimizes machine performance. The operator can choose between manual or auto shift modes.

Transmission Neutralizer

Using the left brake pedal, the operator can engage the service brakes and neutralize the transmission, maintaining high engine rpm for full hydraulic flow, enhancing digging and loading functions.

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, double reduction final drives provide high torque multiplication to further reduce drive train stress.

Oscillating Rear Axle

Oscillating rear axle ensures four-wheel ground contact for maximum traction and stability at all times.


No spin rear differential reduces tire wear and maximizes traction in uneven terrain.

Hydraulic System

Powerful Cat hydraulics deliver exceptional digging and lifting forces and fast cycle times.

Lift and Tilt System

High hydraulic flow rates provide fast hydraulic cylinder response and powerful lift forces. Large-bore tilt and lift cylinders deliver exceptional strength, performance and durability.

Pilot Controls

Low effort, pilot operated joystick implement control with simultaneous lift and tilt functions optimizes operating efficiency. Optional circuit controls enable ejector bucket to be controlled from a switch on the joystick.

Steering System

STIC™ control system integrates steering and transmission functions into a single controller for maximum responsiveness and smooth control.

Optional Ride Control

The optional ride control system uses a nitrogen filled oil accumulator in the hydraulic lift circuit to act as a shock absorber for the bucket and lift arms. The lift arm and bucket response to movement is dampened over rough ground, reducing fore and aft pitch, improving cycle times and load retention. A smoother, more comfortable ride gives operators the confidence to travel at speeds above 5 km/h (3 mph) during load and carry operations.

Cat Hydraulic Hose

Field proven Cat high pressure XT hydraulic hoses are exceptionally strong and flexible for maximum system reliability and long life in the most demanding conditions. Reusable couplings with O-ring face seals provide superior, leak free performance and prolong hose assembly life.

Frame Design

The frame is engineered to withstand extreme forces generated during loading and tramming cycles. Precision manufacturing process ensures all structures are consistently built to high quality. Deep penetration and consistent welds throughout the frame ensures structures are solidly fused to provide sturdy platform for the linkage and the axles. The design and manufacturing quality of Cat LHD frames have been proven by our customers, many of whom reuse frames during machine rebuilds to get 2nd and 3rd lives out of their LHD’s.


Spread hitch design widens the distance between upper and lower hitch plates to distribute forces and increase bearing life. Thicker hitch plates reduce deflection. The wide opening provides easy service access. Upper and lower hitch pins pivot on roller bearings to distribute horizontal and vertical loads over a greater surface area. Shim adjusted preload reduces maintenance time. An on-board steering frame lock pin is fitted to prevent articulation during maintenance and service.

Sealed Pins

Sealed colleted pins are fitted to all major bucket and lift arm hinge points for longer pin and bushing life. This reduces maintenance costs and extends service intervals. The sealed joints retain lubrication and prevent contaminant entry.

Z-bar Loader Linkage

Proven Z-bar loader linkage geometry generates powerful breakout force and an increased rack back angle for better bucket loading and material retention. Heavy duty steel lift arms with cast steel cross tube ensures extreme loads encountered during loading and tramming are efficiently dissipated for long service life.

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

Optional Enclosed Cab

Optional sound-suppressed ROPS cab provides a quiet, secure working environment. Large window openings offer excellent visibility in all directions. Enclosed design provides fresh, pressurized, temperature-controlled air circulation with air condition for a more comfortable working environment.

STIC Steering and Transmission Integrated Control

STIC provides effortless control of the complete mobility of the machine by single controller. Simple side-to-side motion articulates the machine. Directional shifting (forward/neutral/reverse) is controlled using a three position rocker switch. The thumb operated buttons control gear selection.

Dual-Pedal Braking

Dual brake pedals function as a brake and a transmission neutralizer so the operator can maintain high engine rpm for full hydraulic flow and fast cycle times.

Monitoring System

Cat Electronic Monitoring System (Cat EMS) continuously provides critical machine data to keep the machine performing at top production levels.


Aggressive Cat bucket designs deliver unmatched productivity in the most demanding applications. Underground mining buckets are designed for optimal loadability and structural reliability to help lower your cost-per-ton.

Bucket Selection

Cat underground loader buckets are available in two styles to meet a range of loading, hauling and dumping conditions.

  • Dump buckets
  • Ejector buckets

Bucket Capacities

Buckets are available in a range of sizes and capacities to suit most material types and densities.

Optional Wear Packages

Weld-on wear plates in high wear areas are standard. Additional wear packages, including sacrificial wear strips and Cat heel shrouds protect the edges from damage and reduce the need for costly bucket rebuilds.

Optional Cutting Edges

Cat half arrow and cast half arrow cutting edges extend bucket life in high wear applications.

Additional GET option is the Cat weld-on GET. Available weld-on GET offers more wear material to maximize system wear life and bucket protection. Downtime is also reduced by an even wear rate between corners and edge segments, allowing both to be replaced at the same time.

Another available option in the Cat Bolt-on Half Arrow (BOHA) GET System allows a step up over the Cat Weld On (CWO) offering. With an industry recognized bolt-on retention system, this GET is designed for extreme conditions in abrasive environments where traditional Weld-on GET is subject to high wear rates.

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 all tanks, filters, lubrication points and compartment drains.

Air Filters

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

Sight Gauges

Fluid level checks are made easier with sight gauges.


Cat Electronic Technician (Cat ET) service tool enables quick electronic diagnosis of machine performance and key diagnostic data for effective maintenance and repairs.

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. Sample point adapters fitted standard to machine.

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 will be with you every step of the way with its unsurpassed worldwide parts support, trained technicians and customer support agreements.

Technology Products

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


Repair or rebuild? Your Cat dealer can help you evaluate the costs so you can make the right choice.

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 Shut Off 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 brake system is 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 failure.

Standard Safety Features

Anti-skid upper deck surfaces, ground level compartment sight gauges, increased visibility, 3-point access to cab and machine, push out safety glass, suspension seat, inertia reel retractable seat belt, lift arm support pins, hot and cold side of engine, steering frame lock, hinged belly guards.


For more complete information on safety, please visit

Standard Equipment

  • Alternator, 75-amp
  • Receptacle group, auxiliary start
  • Battery Disconnect Switch, Ground Level
  • Starter, electric, 24-volt
  • Diagnostic Connector
  • Engine Shutdown Switch
  • Lighting:
    – External, front, rear
    – Stop, single
  • Batteries, low maintenance
  • Alarm, reversing
  • Starting and Charging System
  • Rims:
    – Tubeless, set of four
  • Tires must be selected from the Mandatory Attachments section, choose between:
    – Tire, 17.5 × R25 VSMS L5S Bridgestone
    – Tire, 17.5 × R25, VSDL Bridgestone
  • Caterpillar Electronic Monitoring System (CEMS), (dash instrument panels)
  • Horns, electric
  • Instrumentation/gauges:
    – Speedometer/tachometer
    – Fuel level
    – Hydraulic oil temperature
    – Engine coolant temperature
  • Light, warning, residual brake
  • Pilot Hydraulic Implement Controls, Single Joystick
  • Cab, ROPS and/or FOPS certified
  • Steering and Transmission Integrated Control (STIC™) Steering
  • Seat, Suspension Tee with retractable seat belt
  • Engine:
    – Cat 3306B six cylinder, diesel
    – DITA (Direct Injection, Turbocharged, Aftercooled)
  • Precleaner, engine air intake
  • Fuel Priming Aid
  • Brakes, full hydraulic enclosed wet multiple-disc (SAFR)
  • Heat Shields
  • Torque Converter
  • Transmission Neutralizer
  • Transmission, automatic planetary power shift (4F/4R)
  • Guards, engine and transmission
  • Bucket Dump (3.1 m3/4.1 yd3)
  • Catalytic Exhaust Purifier/Muffler
  • Cap, Radiator Manual Release
  • Decals, International Picto Graphics
  • Service oil sample
  • Fenders, Front, Rear
  • Firewall
  • Handholds
  • Hydraulic Oil Cooler, Swing Out
  • Valve, drain, transmission oil filter
  • Protection bars, rear frame
  • Radiator Grill, Swing Out

Optional Equipment

  • Rims:
    – Tube, set of four
    – Spare (Tube or Tubeless)
    – Rim Identification Numbering
  • After-Treatment Options
    – DPF (Flow Through)
  • Brake Release Arrangements, Includes Steering Release
    – Recovery Hook
    – Recovery Bar
  • Bucket:
    – Cutting Edge, Bolt-On
    – Cutting Edge, Cat Weld On
    – Heel Shrouds, Ejector and Dump Buckets
    – Lip Fully Welded or Tack Welded
    – Mechanically Attached Wear Plate System (MAWPS)
    – Various Sizes, Dump (2.5 m3/3.2 yd3, 2.8 m3/3.7 yd3, 3.4 m3/4.4 yd3), Ejector (2.4 m3/3.1 yd3)
    – Standard Lip or Bolt-On Lip
    – Wear Bars, Ejector and Dump Buckets
    – Wear Liner
  • Covers:
    – Guard, for lift arm and front frame lights
    – Rear Grill (Additional Bolt-On Guard)
  • Draw Bar Attachment, Bolt-On
  • Fast Fill System:
    – Coolant
    – Engine Oil
    – Fuel
    – Hydraulic Oil
    – Transmission Oil
  • Fire Suppression System
    – Ansul, Powder Based
  • Fluids
    – Arctic Fuel
    – Arctic Coolant
  • Lifting Group, Mine Transfer
  • Lubrication System
    – Automatic
    – Centralized
  • Operators Station ROPS/FOPS Enclosed
    – Air Conditioning
    – Cab Pressurizer and Filter
    – Dome Light
    – Door Strut
    – Heater
    – Radio Ready Compartment for Radio and Speakers
    – Wiper Control, Intermittent
  • Park Brake Automatic Activation
  • Park Brake Switch Engagement
    – Push to Apply
    – Pull to Apply
  • Reflective Tape
  • Remote Control Interface (excludes Transmitter and Receiver), Includes Warning Lights (Green)
    – Cattron
    – RCT
  • Reversible Steering
  • Ride Control System
  • Rim
    – Tube Type
    – Tube or Tubeless (chain ready)
    – Spare (Tube or Tubeless)
    – Rim Identification Numbering
  • Secondary Steering System
  • Service Tools
    – Recovery Bar (for use with Brake Release, Recovery Bar System)
    – Reference Parts Manual for Additional Tooling Available
  • Switches
    – Idle Timer
    – Lift Arm Positioner
    – Transmission Neutralizer Override Switch
    – Transmission Pressure ABA Park Brake Engagement
  • Operator's Station ROPS/FOPS Enclosed:
    – Air Conditioning
    – Cab Pressurizer and Filter
    – Dome Light
    – Door Strut
    – Heater
    – Radio Ready Compartment for Radio and Speakers
    – Wiper Control, Intermittent
  • Instrumentation/gauges:
    – Brake pressures
  • Secondary Steering System
  • Engine:
    – After-Treatment Options – DPF (Flow Through)
  • Reversible Steering
  • Park Brake Automatic Activation
  • Park Brake Switch Engagement – Push to Apply/Pull to Apply
  • Radiator, High Efficiency