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.
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.
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.
The cab shell features thick steel tubing along the bottom perimeter of the cab, improving resistance to fatigue and vibration.
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.
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.
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.
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 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.
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.
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.
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.
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.
A concentrated remote greasing block on the boom delivers grease to hard-to-reach locations on the front.
The engine radiator fan is 180 degree enclosed by fine wire mesh, reducing the risk of an accident.
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.
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.
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.
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.
Engine Power (ISO 14396)
Net Power (SAE J1349/ISO 9249)
Maximum Frontless Machine Weight
Operating Weight - Standard Undercarriage*
Dependent on application, Review
Maximum Drawbar Pull
Maximum Travel Speed
Maximum Pressure - Travel
Maximum Pressure - Swing
Pilot System - Maximum Flow
Pilot System - Maximum Pressure
Main System - Maximum Flow (Total)
Maximum Pressure - Equipment
Service Refill Capacities
Final Drive (each)
Hydraulic System (including tank)
Engine Oil (with filter)
Fuel Tank Capacity
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
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
Laminated front upper windshield
Seat high back, mechanical suspension with head rest
Seat belt, retractable
Bi-level air conditioner (auto) with defroster
Ashtray and lighter
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