Used Caterpillar 312D2GC Excavator

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Here is a detailed English introduction to the Caterpillar 312D2 GC hydraulic excavator.

Caterpillar 312D2 GC Excavator: Detailed Overview

The Caterpillar 312D2 GC is a 12-ton class hydraulic excavator engineered for reliability, fuel efficiency, and low operating costs. The "GC" designation stands for General Construction, indicating that this model is tailored for contractors who need a straightforward, durable, and easy-to-maintain machine for standard earthmoving, utility, and light construction applications. It builds on the proven D-Series platform, offering a balance of power, precision, and affordability without the complexity of more specialized, high-tech models.

1. Engine and Performance

At the heart of the 312D2 GC is the Cat C4.4 ACERT™ electronic diesel engine. This 4.4-liter, 4-cylinder powerplant is designed to deliver robust performance while meeting stringent emission standards.

Net Power: 74.4 kW (99.8 hp) at 2,200 rpm (ISO 9249).
Emission Compliance: Meets U.S. EPA Tier 3 / EU Stage IIIA equivalent standards, depending on the market region.
Fuel Efficiency: The engine features an automatic engine speed control that reduces RPM during no-load or light-load conditions, significantly conserving fuel. An economy mode further optimizes fuel consumption for less demanding tasks.
Reliability: The ACERT technology ensures clean combustion, while the high-capacity cooling system with a hydraulically driven fan maintains optimal operating temperatures in high-ambient conditions, maximizing uptime.

2. Hydraulic System

The hydraulic system of the 312D2 GC is designed for smooth, responsive control and efficient power delivery, enabling operators to achieve high productivity with excellent digging forces.

System Type: A load-sensing, closed-center system with variable-displacement piston pumps.
Main Pump Flow: 2 x 114 L/min (2 x 30.1 gal/min), providing fast cycle times.
Maximum Pressure: 35,000 kPa (5,076 psi) for the implement circuit, generating powerful bucket and arm forces.
Auxiliary Hydraulics: The machine is available with auxiliary hydraulic circuits as an option, allowing for the use of powered attachments such as hammers, thumbs, and compactors. The system is pre-plumbed for easy integration.
Control: Pilot-operated joystick controls offer low-effort, precise modulation, reducing operator fatigue during long shifts. The boom and arm regeneration circuits speed up movement and reduce hydraulic flow demand, contributing to fuel savings.

3. Operator Station

The operator environment in the 312D2 GC prioritizes comfort, visibility, and ergonomic simplicity, which directly translates to higher productivity.

Cab Structure: The ROPS (Roll-Over Protective Structure) certified cab provides a safe working environment. Large glass areas and a narrow cab pillar design give the operator excellent all-around visibility to the work area and tracks.
Comfort: An air-suspension seat with adjustable armrests and a fully adjustable console adapt to the operator’s preferences. The automatic climate control system maintains a consistent temperature.
Monitor and Controls: An intuitive LCD monitor displays critical machine information, including fuel level, coolant temperature, and maintenance alerts. All switches and controls are logically grouped for easy access. A one-touch idle function reduces engine speed with a single button.
Storage: Ample storage spaces are provided, including a cup holder, a magazine rack, and compartments for personal items and tools.

4. Structures and Undercarriage

Durability is a core attribute of the 312D2 GC, starting from its reinforced structures.

Boom and Arm: The front linkage is constructed with high-tensile-strength steel using robot-welded, stress-relieved box-section designs for exceptional longevity in demanding digging applications. A choice of a standard 2.8 m (9'2") arm or a long-reach configuration is available.
Undercarriage: The robust tractor-type undercarriage features a reinforced track frame, sealed and lubricated track links, and a choice of track shoe widths (typically 500 mm or 600 mm). The idler and carrier rollers are designed for long life and smooth operation.
Counterweight: A 2,500 kg (5,511 lb) counterweight provides excellent stability and lift capacity across the working range.

5. Versatility and Work Tools

The 312D2 GC is a versatile platform compatible with a wide range of Cat work tools, allowing it to adapt to various job site requirements.

Buckets: A variety of general-duty (GD) and heavy-duty (HD) buckets are available, with capacities ranging from 0.52 m³ to 0.61 m³ (0.68 yd³ to 0.80 yd³).
Quick Couplers: A Cat pin-grabber or wedge-style quick coupler can be fitted, enabling the operator to change attachments in seconds without leaving the cab, maximizing machine utilization.
Attachment Integration: The optional auxiliary hydraulic system and dedicated attachment control modes (e.g., hammer, shear) optimize flow and pressure settings for specific tools, protecting both the attachment and the machine.

6. Serviceability and Maintenance

Designed for low operating costs, the 312D2 GC features simplified, fast service access to reduce daily maintenance time.

Ground-Level Access: Most routine service points, including the engine oil dipstick, fuel/water separator, and primary hydraulic filters, are accessible from ground level.
Grouped Filters: Hydraulic and engine oil filters are centrally located behind a wide-opening door on the right-hand side of the machine.
Extended Intervals: Long service intervals for engine oil (500 hours), hydraulic oil (4,000 hours), and coolant (6,000 hours) minimize downtime and operating expenses.
Diagnostics: The Cat Electronic Technician (Cat ET) service tool provides a quick, streamlined interface for electronic system diagnostics.

7. Safety Features

Safety is integrated into the design of the excavator.

Anti-Slip Plating: The upper structure deck and walkways are covered with anti-skid plates to reduce the risk of slips.
Mirrors and Lights: A comprehensive lighting package with frame-mounted and boom-mounted work lights illuminates the job site. Large, adjustable rear-view mirrors and a standard rear camera (on most configurations) enhance visibility behind the machine.
Emergency Egress: A secondary exit window is provided in the cab for emergency escape.
Travel Alarm and Horn: Standard audible travel alarm and a warning horn alert ground personnel.

8. Technical Specifications (Typical Configuration)

Component	Specification
Engine Model	Cat C4.4 ACERT
Net Power (ISO 9249)	74.4 kW (99.8 hp)
Operating Weight	12,900 – 13,700 kg (28,440 – 30,200 lbs)
Max Digging Depth	5,540 mm (18 ft 2 in)
Max Reach at Ground Level	8,170 mm (26 ft 10 in)
Max Cutting Height	8,630 mm (28 ft 4 in)
Bucket Digging Force (ISO)	95 kN (21,357 lbf)
Arm Digging Force (ISO)	65 kN (14,613 lbf)
Main Pump Flow	2 x 114 L/min (2 x 30.1 gal/min)
Relief Valve Pressure	35,000 kPa (5,076 psi)
Fuel Tank Capacity	250 L (66.0 gal)
Hydraulic Tank Capacity	93 L (24.6 gal)
Tail Swing Radius	2,140 mm (7 ft 0 in)
Track Shoe Width (Option 1)	500 mm (20 in)
Track Shoe Width (Option 2)	600 mm (24 in)

9. Applications

The Cat 312D2 GC is ideally suited for:

General construction and site preparation.
Utility trenching and pipe laying.
Foundation and footing excavation.
Landscaping and grading.
Demolition of small structures (with appropriate attachments).
Road and bridge maintenance.

Summary

The Caterpillar 312D2 GC is a no-nonsense, reliable workhorse that delivers the essential performance expected of a Cat excavator. By focusing on a simplified design, fuel-efficient engine, and low-maintenance features, it provides a cost-effective solution for contractors and owner-operators whose primary objectives are high uptime, predictable operating costs, and solid day-to-day productivity.

Non flooded

No accident

Original product

Used Caterpillar 312D2GC Excavator

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