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.
SPECIFICATIONS
Engine Model3054C
Flywheel Power67.0 kW
Bore105.0 mm
BENEFITS AND FEATURES
engine
A powerful engine with excellent reliability and low fuel consumption delivering more ...
LEARN MOREhydraulics
Efficient hydraulic system with low effort joysticks provides precise control regardless ...
LEARN MOREengine
Engine Model3054C
Flywheel Power67.0 kW
Bore105.0 mm
Stroke127.0 mm
Displacement4.4 L
Engine Power (ISO 14396)70.0 kW
Net Power (SAE J1349/ISO 9249)67.0 kW
Net Power - ISO 1439670.0 kW
weights
Operating Weight13900.0 kg
Operating Weight - Long Undercarriage13 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)
drive
Maximum Drawbar Pull114.0 kN
Maximum Travel Speed5.6 km/h
swing mechanism
Swing Torque30.9 kN·m
Swing Speed12.2 RPM
hydraulic system
Maximum Pressure - Travel35000.0 kPa
Maximum Pressure - Swing23000.0 kPa
Pilot System - Maximum Pressure4120.0 kPa
Boom Cylinder - Bore110.0 mm
Boom Cylinder - Stroke1015.0 mm
Stick Cylinder - Bore120.0 mm
Stick Cylinder - Stroke1197.0 mm
Bucket Cylinder - Bore100.0 mm
Bucket Cylinder - Stroke939.0 mm
Main System - Maximum Flow (Total)254.0 L/min
Maximum Pressure - Equipment30500.0 kPa
Pilot System - Maximum Flow21.9 L/min (1,340 in3/min)
Swing System - Maximum Flow127.0 L/min
service refill capacities
Cooling System17.88 L
Final Drive (each)3.0 L
Hydraulic System (including tank)104.0 L
Hydraulic Tank90.6 L
Engine Oil (with filter)16.0 L
Fuel Tank Capacity250.0 L
Swing Drive3.0 L
BENEFITS AND FEATURES
ENGINE
A powerful engine with excellent reliability and low fuel consumption delivering more ...
LEARN MOREHYDRAULICS
Efficient hydraulic system with low effort joysticks provides precise control regardless ...
LEARN MORESERVICE AND MAINTENANCE
Simplified service and maintenance features save you time and money.
LEARN MORE312D2/312D2 L STANDARD EQUIPMENT
- engine
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 - electrical
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 - 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
312D2/312D2 L OPTIONS
- 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 - 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 - 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
MOTEUR
Enhance your comfort, operation and visibility.
BENEFITS AND FEATURES
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.
Monitor 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.
Seat 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.
Console 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.
Windows 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.
Wipers 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.
BENEFITS AND FEATURES
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.
BENEFITS AND FEATURES
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.
Strong and durable, all you expect from Cat Excavators.
BENEFITS AND FEATURES
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.
Reliable and durable meeting all your versatility needs.
BENEFITS AND FEATURES
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.
Stick 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.
Dig, hammer, rip, and cut with confidence.
BENEFITS AND FEATURES
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.
Couplers 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.
Buckets 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.
Simplified service and maintenance features save you time and money.
BENEFITS AND FEATURES
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.
Cat dealer services help you operate longer with lower costs.
BENEFITS AND FEATURES
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.
Replacement Repair, rebuild, or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.