Used Caterpillar 312D Excavator

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CATERPILLAR 312D Hydraulic Excavator: Detailed Introduction

The Caterpillar 312D is a 12-ton class midsize hydraulic excavator under Caterpillar’s iconic D-series lineup, developed on the basis of Caterpillar’s 90+ years of heavy equipment manufacturing expertise. It is engineered to balance strong power output, high fuel efficiency, precise operation and extreme durability, making it one of the best-selling models in the 12-ton excavator segment globally, suitable for both light and medium-duty construction scenarios.

1. Core Specifications (Standard Configuration)

Parameter	Specific Value
Operating Weight	12,400 – 13,600 kg (varies by configuration)
Net Rated Power	72 kW (97 hp) @ 2200 rpm
Bucket Capacity	0.37 – 0.8 m³
Maximum Digging Depth	5,810 mm
Maximum Horizontal Reach (Ground Level)	8,770 mm
Maximum Dumping Height	6,190 mm
Travel Speed	3.1 kph (low) / 5.1 kph (high)
Swing Speed	11.5 rpm
Maximum Drawbar Pull	114 kN
Emission Standard	EU Stage IIIA / US EPA Tier 3

2. Engine Performance

The 312D is equipped with the Cat C4.2 ACERT™ 4-cylinder turbocharged aftercooled diesel engine, with industry-leading reliability and adaptability:

Caterpillar’s proprietary ACERT combustion optimization technology reduces fuel consumption by 6-8% compared to the previous-generation 312C, without sacrificing power output.
Built-in auto-idle and auto-engine-shutdown functions automatically lower engine speed or shut down the engine during long idle periods, cutting unnecessary fuel waste by up to 15% in low-workload scenarios.
Excellent extreme environment adaptability: supports cold start at -15°C without auxiliary heating, and maintains full power output at altitudes below 3000m.
3-stage fuel filtration system adapts to low-quality diesel in underdeveloped regions, reducing engine failure risks.

3. Hydraulic System

The 312D adopts Caterpillar’s mature load-sensing flow-sharing hydraulic system, delivering smooth and precise operation experience:

Main pump maximum flow reaches 220 L/min, system working pressure is 35 MPa, ensuring strong digging force even during compound operations (digging, swinging, lifting at the same time) without lag.
Light-touch pilot control joysticks reduce operator fatigue during long-hour work, and support fine adjustment for precision scenarios such as pipe laying and slope trimming.
Optional auxiliary hydraulic circuit supports a wide range of work tools (hydraulic breaker, grapple, shear, auger, etc.), and the optional quick coupler allows tool replacement within 5 minutes.
Hydraulic oil service life reaches 5000 hours under normal working conditions, greatly reducing maintenance costs.

4. Operator Comfort & Safety

The cab of the 312D meets ROPS (Roll-Over Protective Structure) and FOPS (Falling Object Protective Structure) certification, with a full range of humanized designs:

Sealed and pressurized cab isolates external dust and noise, internal operating noise is as low as 74 dB(A), reaching office-level quietness.
Multi-direction adjustable suspension seat with lumbar support fits operators of different heights and body types.
Full-width glass windows and narrow pillar design provide 270° unobstructed view, reducing blind spots during operation.
High-resolution LCD monitor displays real-time operating data (oil temperature, fuel level, fault code, etc.) in real time, making it easy for operators to grasp equipment status.
Optional rearview camera, Bluetooth audio system and high-efficiency heating/cooling air conditioner further improve operating comfort in extreme weather.

5. Durability & Maintainability

The 312D is designed for long service life in harsh working conditions:

The boom, stick and main frame are welded with high-strength tensile steel, and have passed 10,000-hour extreme working condition stress tests, with low deformation and fracture risk.
Heavy-duty undercarriage adopts high-manganese steel track shoes and sealed lubricated rollers/track chains, service life is 30% longer than similar competing models.
All daily maintenance points (engine oil level check, coolant filling, air filter replacement, etc.) are designed to be accessible from the ground, no need to climb onto the upper structure, cutting daily inspection time by half.
Optional Caterpillar Product Link™ telematics system supports real-time monitoring of equipment location, working hours, fuel consumption and fault warning, greatly improving fleet management efficiency.
Supported by Caterpillar’s global 24/7 after-sales agent network, spare parts supply is guaranteed, and technical support is available in almost all regions around the world.

6. Typical Application Scenarios

Urban municipal construction: road repair, pipe laying, landscaping, sidewalk renovation
Small and medium building construction: foundation digging, construction material handling
Light demolition: low-rise building demolition, waste sorting and handling
Agricultural and forestry work: land improvement, forest logging and transportation
Quarry and mining: light material loading, site clearing

Overall, the Cat 312D stands out for its low operating cost, high residual value and outstanding reliability, making it an ideal choice for both individual contractors and large construction fleets.

Non flooded

No accident

Original product

Used Caterpillar 312D Excavator

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