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Small 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/D L Series 2 Hydraulic Excavators

Achieve high productivity and lower operating costs with the Cat 312D/D L Series 2 hydraulic excavator. Unmatched versatility, improved controllability, easy operation, and a comfortable, redesigned operator station help make the 312D/D L Series 2 an industry-leading performer.

Product Details


Engine Model 3054C
Flywheel Power 67.0 kW
Bore 105.0 mm
Stroke 127.0 mm
Displacement 4.4 L
Engine Power (ISO 14396) 70.0 kW
Net Power (SAE J1349/ISO 9249) 67.0 kW
Net Power - ISO 14396 70.0 kW


Operating Weight 13900.0 kg
Operating Weight - Long Undercarriage 13 200 kg-13 900 kg (29,100 lb-30,640 lb)
Operating Weight - Long Undercarriage - Maximum Operating Weight** 13900.0 kg
Operating Weight - Long Undercarriage - Minimum Operating Weight* 13200.0 kg
Operating Weight - Standard Undercarriage - Maximum Operating Weight** 13600.0 kg
Operating Weight - Standard Undercarriage - Minimum Operating Weight* 12900.0 kg
Operating Weight - Standard Undercarriage* 12 900 kg-13 600 kg (28,440 lb-29,980 lb)


Maximum Drawbar Pull 114.0 kN
Maximum Travel Speed 5.6 km/h

Swing Mechanism

Swing Torque 30.9 kN·m
Swing Speed 12.2 RPM

Hydraulic System

Maximum Pressure - Travel 35000.0 kPa
Maximum Pressure - Swing 23000.0 kPa
Pilot System - Maximum Pressure 4120.0 kPa
Boom Cylinder - Bore 110.0 mm
Boom Cylinder - Stroke 1015.0 mm
Stick Cylinder - Bore 120.0 mm
Stick Cylinder - Stroke 1197.0 mm
Bucket Cylinder - Bore 100.0 mm
Bucket Cylinder - Stroke 939.0 mm
Main System - Maximum Flow (Total) 254.0 L/min
Maximum Pressure - Equipment 30500.0 kPa
Pilot System - Maximum Flow 21.9 L/min (1,340 in3/min)
Swing System - Maximum Flow 127.0 L/min

Service Refill Capacities

Cooling System 17.88 L
Final Drive (each) 3.0 L
Hydraulic System (including tank) 104.0 L
Hydraulic Tank 90.6 L
Engine Oil (with filter) 16.0 L
Fuel Tank Capacity 250.0 L
Swing Drive 3.0 L

Operator Station

Enhance your 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 27 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 static 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 height 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.


A powerful engine with excellent reliability and low fuel consumption delivering more while boosting your bottom line.

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 67 kW (90 hp) the 312D/D L Series 2 has been designed with fuel economy in mind and burns less fuel compared with the previous model depending on application.

Economy Mode

Available as standard, economy mode allows you to balance the demands of performance and fuel economy while maintaining the breakout forces and lift capacity enjoyed at standard power.


Efficient hydraulic system with low effort joysticks provides precise control regardless of your application.

Outstanding Performance

The 312D/D L 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 shorter 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.
  • A hydraulic cross-sensing system uses two hydraulic pumps under all operating conditions, improving productivity with faster implement speeds and quicker, stronger pivot turns.

Boom and Stick Regeneration Circuit

The boom and stick regeneration circuit saves energy during boom-down and stick-in operation, increasing efficiency and lowering operating costs.

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.

Undercarriage and Structures

Strong and durable, all you expect from Cat Excavators.

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/D L Series 2 automatically change up and down from high and low speeds in a smooth, controlled manner.

Front Linkage

Reliable and durable meeting all your versatility needs.

Robust applications require robust machine designs. In order to meet your job site needs we use advanced engineering and software to analyze all structures, creating a durable, reliable machine.


The 2.5 m (8'2") and 3 m (9'10") reach sticks incorporate new forging and welding processes for increased durability, digging force, and lifting capacity.

Reach Boom

A 4.65 m (15'3") one-piece, reach boom features parts made from a new forging pattern. A light attached to the left side offers improved visibility in dark and low-light conditions.

Work Tools

Dig, hammer, rip, and cut with confidence.

Each Cat work tool is designed to optimize the versatility and performance of your machine. An extensive range which includes buckets, compactors, grapples, multi-processors, rippers, crushers, pulverizers, hammers and shears is available for your 312D/D L Series 2.


Quick couplers allow one person to change work tools in seconds for maximum performance and flexibility on a job site. One machine can move rapidly from task to task, and a fleet of similarly equipped machines can share a common work tool inventory.

CW Dedicated Coupler

The CW quick coupler can pick up any work tool and is equipped with a wedge-style locking system that fits the quick coupler tight to the tool hinges. Due to the tapered wedge design, there won’t be any play during its entire life. Also it is interchangeable with different machine classes. The CW is highly suitable for harsh applications, such as demolition and quarries.

Center-Lock™ Pin Grabber Coupler

Center-Lock is the pin grabber style coupler and features a patent-pending locking system. A highly visible secondary lock clearly shows the operator when the coupler is engaged or disengaged from the bucket or work tool.


Cat Buckets and Cat Ground Engaging Tools (GET) are designed and matched to the machine ensuring optimal performance and fuel consumption.

General Duty Buckets (GD)

These buckets are designed for digging in low-impact, moderately abrasive materials such as dirt, loam, gravel and clay.

Heavy Duty Buckets (HD)

HD buckets are a good starting point when application conditions vary. Especially when conditions include mixed dirt, clay and sand and gravel.

Severe Duty Buckets (SD)

These buckets are best suited to highly abrasive applications such as shot rock, sand stone and granite.

Hydraulic Kits*

Caterpillar offers field-installed hydraulic kits that are uniquely designed to integrate Cat Work Tools with Cat excavators. Hoses and tubes are pre-made, pre?shaped, and pre-painted to make installation quick and easy. *Offering varies for different regions.

Comprehensive Product Support

All Cat work tools are backed up by a world-wide network of well-stocked spare parts depots and highly experienced after-sales service and support personnel. Work tools available vary by region. Contact your local Cat dealer for more information about the work tools available in your region.

Service and Maintenance

Simplified service and maintenance features save you time and money.

Ground Level Service

The design and layout of the 312D/D L 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, the engine oil filter, S·O·SSM sampling port, and diagnostic pressure taps.

Radiator Compartment

The left service door allows easy access to the engine radiator, oil cooler, 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 Return Filter

The hydraulic return filter is situated outside the hydraulic tank. This filter prevents contaminants from entering the system when hydraulic oil is changed and keeps the operation clean.

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 heavy wire guard, 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/D L Series 2 is equipped with S·O·S sampling ports and hydraulic test ports for the hydraulic system, engine oil, and for coolant. A test connection for the Cat Electronic Technician (Cat ET) service tool is located behind the cab.

Extended Service Interval

312D/D L Series 2 service and maintenance intervals have been extended to reduce machine service time and increase 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. A wide range of Cat remanufactured components are available for the 312D/D L Series 2, further lowering repair costs and supporting sustainable practices.

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 (7,545 ft) 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 (109° F) High ambient cooling
    •  Meets the U.S. EPA Tier 2 and EU Stage II regulations
    •  Economy mode
  • 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
    •  Openable skylight/metal hatch
    •  Interior lighting
    •  Standard joystick
    •  Laminated front upper windshield
    •  Seat high back, mechanical suspension with head rest
    •  Seat belt, retractable, 50 mm (2")
    •  Floor mat
    •  Bi-level air conditioner (auto) with defroster
    •  Windshield washer
    •  Coat hook
    •  Ashtray and lighter
    •  Beverage holder
    •  Literature holder
    •  Utility space for magazine
    •  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
                • Openable skylight/metal hatch
                  • Interior lighting
                    • Standard joystick
                      • Laminated front upper windshield
                        • Seat high back, mechanical suspension with head rest
                          • Seat belt, retractable, 50 mm (2")
                            • Floor mat
                              • Bi-level air conditioner (auto) with defroster
                                • Windshield washer
                                  • Coat hook
                                    • Ashtray and lighter
                                      • Beverage holder
                                        • Literature holder
                                          • Utility space for magazine
                                            • 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
                                                                      • Cat battery
                                                                        • HYDRAULIC
                                                                          •  Hydraulic main pump
                                                                          •  High performance hydraulic return filter
                                                                          •  Regeneration control for boom and stick
                                                                          •  Boom lowering device for back up
                                                                          •  Boom drift reducing valve
                                                                          •  Stick drift reducing valve
                                                                          •  Reverse swing damping valve
                                                                          •  Automatic swing parking brake
                                                                          •  Auxiliary hydraulic valve
                                                                          •  Capability of stackable valves for main valve
                                                                          •  Capability of auxiliary circuit
                                                                        • 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
                                                                          •  Rearview camera-ready
                                                                        • 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
                                                                                      • Rearview camera-ready
                                                                                        • LIGHTS
                                                                                          •  Halogen boom light (left side)
                                                                                          •  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
                                                                                        • ENGINE
                                                                                          •  Cold weather batteries, -25° C (-13° F)
                                                                                          •  Air precleaner
                                                                                          •  52° C (126° F) High ambient cooling
                                                                                        • HYDRAULIC
                                                                                          •  Combined circuit
                                                                                          •  Combined circuit with medium pressure
                                                                                          •  Center-Lock quick coupler lines and control
                                                                                          •  Joystick with modulation SW
                                                                                          •  Boom and Stick high pressure, medium pressure and quick couple line options
                                                                                          •  Control pattern quick-changer, four way
                                                                                        • CAB
                                                                                          •  Seat with seat heater, high back, air suspension with head rest
                                                                                          •  Pull-down sunscreen
                                                                                          •  12V-10A power supply with two cigar lighter type sockets
                                                                                        • UNDERCARRIAGE
                                                                                          •  500 mm (20") triple grouser shoes
                                                                                          •  600 mm (24") triple grouser shoes
                                                                                          •  700 mm (28") triple grouser shoes
                                                                                          •  770 mm (30") triple grouser shoes
                                                                                        • 500 mm (20") triple grouser shoes
                                                                                          • 600 mm (24") triple grouser shoes
                                                                                            • 700 mm (28") triple grouser shoes
                                                                                              • 770 mm (30") triple grouser shoes
                                                                                                • COUNTERWEIGHT
                                                                                                  •  Counterweight without lifting eye (2450 kg/5,400 lb)
                                                                                                  •  Counterweight without lifting eye (2650 kg/5,840 lb)
                                                                                                • FRONT LINKAGE
                                                                                                  •  Boom, 4.65 m (15'3")
                                                                                                  •  Stick, 2.5 m (8'2")
                                                                                                  •  Stick, 3.0 m (9'10")
                                                                                                  •  Bucket linkage
                                                                                                  •  Quick coupler
                                                                                                • LIGHTS
                                                                                                  •  Cab lights
                                                                                                  •  Halogen boom light (right side)
                                                                                                • SECURITY
                                                                                                  •  Travel alarm
                                                                                                  •  Rearview camera and right side mirrors
                                                                                                  •  Cab mirror
                                                                                                • Travel alarm
                                                                                                  • Rearview camera and right side mirrors
                                                                                                    • Cab mirror
                                                                                                      • TECHNOLOGY
                                                                                                        •  Product Link, Satellite or Cellular
                                                                                                      • GUARDS
                                                                                                        •  FOGS (bolt on)
                                                                                                        •  Guard, heavy duty bottom
                                                                                                        •  Swivel guard
                                                                                                      • BLADES
                                                                                                        •  Blade, 2500 mm (8'2") with replaceable cutting edge
                                                                                                        •  Blade, 2600 mm (8'6") with replaceable cutting edge
                                                                                                      • Blade, 2500 mm (8'2") with replaceable cutting edge
                                                                                                        • Blade, 2600 mm (8'6") with replaceable cutting edge

                                                                                                          360° Exterior View

                                                                                                          360° Interior View

                                                                                                          Built for it