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Frontless Excavators

Caterpillar serves all regions of the world so we build many different configurations of hydraulic excavators. Your Cat® dealer has exact machine specifications available in your area to help you choose what will best meet your needs.

312D GC Series 2 Hydraulic Excavator

Good machine performance combined with low owning and operating costs make the Cat® 312D GC OEM Series 2 hydraulic excavator the preferred machine of choice for utility contractors. Unmatched versatility, improved controllability, easy operation, and a comfortable, redesigned operator station help make the 312D GC Series 2 Specialty Based Solution Excavator an industry-leading performer.

Product Details

Operator Station

Enhanced comfort, operation and visibility.

Operator Station

The ergonomically designed operator station is spacious, quiet, and comfortable, assuring high productivity during a long work day. All switches are located on the right-hand console for convenient access.


The monitor is a full-color Liquid Crystal Display (LCD) that can be adjusted to minimize sun glare and has the capability of displaying information in Chinese and 26 other languages.

Joystick Control

Low-effort pilot-operated joystick controls are designed to match the operator’s natural wrist and arm position for maximum comfort and minimum fatigue.


The standard suspension seat provides a variety of adjustments to suit the operator’s size and weight including fore/aft height and weight. Wide adjustable armrests and a seat belt are also included.


The consoles feature a simple functional design to reduce operator fatigue, ease of switch operation, and excellent visibility. Both consoles have attached armrests with tilting adjustments.

Cab Exterior

The cab shell features thick steel tubing along the bottom perimeter of the cab, improving resistance to fatigue and vibration.

Cab Mounts

The cab shell is attached to the frame with viscous rubber cab mounts, which dampen vibrations and sound levels while enhancing operator comfort.


To maximize visibility, all glass is affixed directly to the cab, eliminating window frames. The upper front windshield opens, closes, and stores on the roof above the operator with a one-touch action release system.


Pillar-mounted wipers increase the operator’s viewing area and offer continuous and intermittent modes.


The Cat® 3054C engine optimizes performance and meets emission regulation.

The Cat® 3054C engine has been designed to meet U.S. EPA Tier 2 and EU Stage II emission regulations. This engine incorporates a time-proven mechanical governor and a low-pressure fuel injection system that are major contributors to the improvement of fuel system robustness, high fuel efficiency, and ease of troubleshooting. High filtration performance from the primary filter incorporating a water separator and a secondary filter also help to improve fuel filtration system reliability.

Automatic Engine Control and Fuel Delivery

With a net power of 56 kW (75 hp) the 312D GC Series 2 has been designed with fuel economy in mind and burns approximately 14% less fuel when compared with the previous model depending on application.


Low effort and precise control for highly efficient performance.

Outstanding Performance

The 312D GC Series 2 hydraulic system is designed for high efficiency and performance. Auxiliary hydraulic and electrical lines are routed to the boom foot making installation of hydraulic circuits much easier. This compact design utilizes short tubes and lines to reduce friction and pressure drops, resulting in a more efficient use of power.
  • Hydraulic snubbers at the rod end of the boom cylinders and both ends of the stick cylinders cushion shock, reduce sound, and increase cylinder life.
  • Flow is reduced to a minimum when controls are in neutral to reduce fuel consumption and extend component life.
  • A hydraulic cross-sensing system uses two hydraulic pumps up under all operating conditions, improving productivity with faster implement speeds and quicker, stronger pivot turns.

Easy Operation

Work mode and power mode switches have been eliminated making full power available at all times. Operators do not need to learn different modes. An automatic boom and swing priority function automatically selects the best mode based on joystick movement.

Optional Undercarriage and Structures

Strong, stable and easy to maneuver.

Caterpillar uses advanced engineering and software to analyze all structures, creating a durable, reliable machine for robust applications. More than 70 percent of the structural welds are robotic and achieve additional penetration over manual welds. These structural components and undercarriage are the backbone of the machine’s durability.

Carbody Design

X-shaped, box-section carbody provides excellent resistance to torsional bending. Robot-welded track roller frames are press-formed, pentagonal units that deliver exceptional strength and service life.

Grease Lubricated Track

Grease lubricated track seals protect the track link and deliver long track link pin and bushing inner wear.

Travel Motors

Travel motors with automatic speed selection let the 312D GC Series 2 automatically change up and down from high and low speeds in a smooth, controlled manner.


More options for more work.

Cat Buckets and Cat Ground Engaging Tools (GET) are designed and matched to the machine ensuring optimal performance and fuel consumption. They are built to Caterpillar specifications guaranteeing quality and durability, whatever the application.

Utility Buckets

For digging in low-impact, low abrasive material such as dirt, loam and clay.
  • Shallow profile is easier to empty sticky materials.
  • Lightest structures decrease load time and increase the weight that can be lifted.
  • Pre-drilled sidebars for optional sidecutters.

Service and Maintenance

Simplified service and maintenance features save you time and money.

Ground Level Service

The design and layout of the 312D GC Series 2 was made with the service technician in mind. Most service locations are easily accessible at ground level allowing service and maintenance to get completed quickly and efficiently.

Pump Compartment

A service door on the right side of the upper structure allows ground-level access to the pump, pilot filter, drain filter, and the engine oil filter.

Radiator Compartment

The left service door allows easy access to the engine radiator, oil cooler, air-to-air-aftercooler, water separator and first and second fuel filter. A reserve tank and drain cock are attached to the radiator for simplified maintenance. The air filter features a double-element construction for superior cleaning efficiency. When the air cleaner plugs, a warning is displayed on the monitor screen inside the cab.

Hydraulic Filter

The hydraulic return filter is an in-tank design with a service life of 2,000 hours. A sensor indicates through the in-cab monitor when the filter is plugged and needs to be replaced.

Greasing Points

A concentrated remote greasing block on the boom delivers grease to hard-to-reach locations on the front.

Fan Guard

The engine radiator fan is 180 degree enclosed by fine wire mesh, reducing the risk of an accident.

Anti-Skid Plate

Anti-skid plate covers top of storage box and upper structure to prevent slipping during maintenance.

Diagnostics and Monitoring

The 312D GC Series 2 is equipped with S·O·SSM sampling ports and hydraulic test ports for the hydraulic system, engine oil, and for coolant. A test connection for the Caterpillar Electronic Technician (Cat ET) service tool is located behind the cab.

Extended Service Interval

312D GC Series 2 service and maintenance intervals are long which results in reduced service time and increased machine availability.

Complete Customer Support

Cat dealer services help you operate longer with lower costs.

Product Support

You will find nearly all parts at our dealer parts counter. Cat dealers utilize a worldwide computer network to find in-stock parts to minimize machine downtime. Save money with remanufactured components.

Machine Selection

Make detailed comparisons of the machines you are considering before you buy. What are the job requirements, machine attachments and operating hours? What production is needed? Your Cat dealer can provide recommendations.

Maintenance Services

Repair option programs guarantee the cost of repairs up front. Condition monitoring services and diagnostic programs such as scheduled oil sampling, coolant sampling, and technical analysis help you avoid unscheduled repairs.

Customer Support Agreements

Cat dealers offer a variety of product support agreements, and work with customers to develop a plan that best meets specific needs. These plans can cover the entire machine, including attachments, to help protect the customer’s investment.


Repair, rebuild, or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.
    •  Diesel engine - Cat 3054C with mechanical governor: - 2300 m altitude capability - 50 amp alternator, air intake heater - Tier 2 emission package
    •  10 micron fuel filter
    •  4 micron fuel pre-filter
    •  One touch low idle with AEC
    •  Remote engine oil filter
    •  Radial seal air filter, double element
    •  Two speed travel
    •  Water separator in fuel line with indicator
    •  Waved fin radiator with side by side type oil cooler
    •  Fix type A/C condenser
    •  43° C High ambient cooling
    •  Air precleaner
  • Diesel engine - Cat 3054C with mechanical governor: - 2300 m altitude capability - 50 amp alternator, air intake heater - Tier 2 emission package
    • 10 micron fuel filter
      • 4 micron fuel pre-filter
        • One touch low idle with AEC
          • Remote engine oil filter
            • Radial seal air filter, double element
              • Two speed travel
                • Water separator in fuel line with indicator
                  • Waved fin radiator with side by side type oil cooler
                    • Fix type A/C condenser
                      • 43° C High ambient cooling
                        • Air precleaner
                          • CAB
                            •  Bolt-on FOGS capability
                            •  Openable front windshield with assist device
                            •  Pillar mounted upper windshield wiper and washer
                            •  Front windshield glass split by 70/30
                            •  Cab sliding upper door window
                            •  Rear window, emergency exit
                            •  Removable lower windshield with in cab storage bracket
                            •  Metal hatch
                            •  Interior lighting
                            •  Standard joystick
                            •  Laminated front upper windshield
                            •  Seat high back, mechanical suspension with head rest
                            •  Seat belt, retractable
                            •  Floor mat
                            •  Bi-level air conditioner (auto) with defroster
                            •  Windshield washer
                            •  Coat hook
                            •  Ashtray and lighter
                            •  Beverage holder
                            •  Literature holder
                            •  Radio mounting
                            •  Mounting for two stereo speakers
                            •  Antenna flexible type
                            •  Storage compartment suitable for lunch box
                            •  Monitor: - Language display - Full graphic and full color display - Warning information - Filter/fluid change information - Machine condition - Error code and tool mode setting information - Full time clock on monitor
                            •  Positive filtered ventilation
                            •  Seat integrated control joystick
                            •  Adjustable armrest
                            •  Adjustable console
                            •  Neutral lever (lock out) for all controls
                            •  Travel control pedals with removable hand levers
                            •  Capability of installing two additional pedals
                          • Bolt-on FOGS capability
                            • Openable front windshield with assist device
                              • Pillar mounted upper windshield wiper and washer
                                • Front windshield glass split by 70/30
                                  • Cab sliding upper door window
                                    • Rear window, emergency exit
                                      • Removable lower windshield with in cab storage bracket
                                        • Metal hatch
                                          • Interior lighting
                                            • Standard joystick
                                              • Laminated front upper windshield
                                                • Seat high back, mechanical suspension with head rest
                                                  • Seat belt, retractable
                                                    • Floor mat
                                                      • Bi-level air conditioner (auto) with defroster
                                                        • Windshield washer
                                                          • Coat hook
                                                            • Ashtray and lighter
                                                              • Beverage holder
                                                                • Literature holder
                                                                  • Radio mounting
                                                                    • Mounting for two stereo speakers
                                                                      • Antenna flexible type
                                                                        • Storage compartment suitable for lunch box
                                                                          • Monitor: - Language display - Full graphic and full color display - Warning information - Filter/fluid change information - Machine condition - Error code and tool mode setting information - Full time clock on monitor
                                                                            • Positive filtered ventilation
                                                                              • Seat integrated control joystick
                                                                                • Adjustable armrest
                                                                                  • Adjustable console
                                                                                    • Neutral lever (lock out) for all controls
                                                                                      • Travel control pedals with removable hand levers
                                                                                        • Capability of installing two additional pedals
                                                                                          • ELECTRICAL
                                                                                            •  Circuit breaker
                                                                                            •  Cat battery
                                                                                            •  Circuit breaker
                                                                                          • Circuit breaker
                                                                                            • Cat battery
                                                                                              • Circuit breaker
                                                                                                • COUNTERWEIGHT
                                                                                                  •  Counterweight without lifting eye (2100 kg)
                                                                                                • TECHNOLOGY
                                                                                                  •  Product Link, Cellular
                                                                                                • Product Link, Cellular
                                                                                                  • HYDRAULIC
                                                                                                    •  Hydraulic main pump
                                                                                                    •  High performance hydraulic return filter
                                                                                                    •  Automatic swing parking brake
                                                                                                    •  Capability of stackable valves for main valve
                                                                                                    •  Capability of auxiliary circuit
                                                                                                    •  Boom drift reducing valve*
                                                                                                    •  Stick drift reducing valve*
                                                                                                    •  Reverse swing damping valve*
                                                                                                    •  Auxiliary hydraulic valve*
                                                                                                  • Hydraulic main pump
                                                                                                    • High performance hydraulic return filter
                                                                                                      • Automatic swing parking brake
                                                                                                        • Capability of stackable valves for main valve
                                                                                                          • Capability of auxiliary circuit
                                                                                                            • Boom drift reducing valve*
                                                                                                              • Stick drift reducing valve*
                                                                                                                • Reverse swing damping valve*
                                                                                                                  • Auxiliary hydraulic valve*
                                                                                                                    • SECURITY
                                                                                                                      •  Cat one key security system
                                                                                                                      •  Signaling/warning horn
                                                                                                                      •  Mirrors, rearview (frame - right, cab - left)
                                                                                                                      •  Secondary engine shutoff switch
                                                                                                                      •  Door locks
                                                                                                                      •  Cap locks on fuel and hydraulic tanks
                                                                                                                      •  Lockable external tool/storage box
                                                                                                                      •  Openable skylight for emergency exit
                                                                                                                      •  Rearview camera-ready
                                                                                                                    • LIGHTS
                                                                                                                      •  Exterior lights integrated into storage box
                                                                                                                    • UNDERCARRIAGE
                                                                                                                      •  Grease lubricated track (GLT2)
                                                                                                                      •  Idler section track guiding guard
                                                                                                                      •  Towing eye on base frame
                                                                                                                      •  Standard idler tension spring
                                                                                                                      •  Guard, standard bottom
                                                                                                                      •  500 mm triple grouser shoes
                                                                                                                    Built for it