Japan Used Caterpillar Excavator CAT312D2 Second-hand Excavators 12 Ton Machine for Construction EPA

The following is a detailed description of the Caterpillar 312D excavator:

1. Equipment positioning and basic information

Tonnage and type:

The Caterpillar 312D is a 12-ton small crawler backhoe excavator with a working weight of 12,920kg and a standard bucket capacity of 0.52m³. It is suitable for small and medium-sized earthwork projects, municipal construction, and farmland water conservancy.

Production background:

Designed by Caterpillar Inc. of the United States, some models are produced in Xuzhou, China. It is a joint venture/imported product, continuing Caterpillar's technological advantages in the field of construction machinery.

2. Core parameters and performance

Power system

Engine:

Equipped with Cat® C4.2 ACERT engine, rated power 72kW (2200rpm), displacement 4.25L, cylinder diameter × stroke 102×130mm, water-cooled design, taking into account power output and fuel economy.

Fuel and maintenance:

The fuel tank capacity is 250L, and the engine oil replacement volume is 19.5L, which supports long-term continuous operation and has low maintenance costs.

Hydraulic system

Main pump flow:

The maximum flow of the main pump is 127L/min, the main overflow pressure is 30.5MPa, and the pilot pressure is 4.12MPa, providing stable hydraulic power.

Optimized design:

The hydraulic system increases the digging force and lifting force by increasing the hydraulic pressure by 2%, and the auxiliary pipeline is integrated into the boom base to reduce pressure loss and improve installation efficiency.

Operation performance

Digging force and speed:

Bucket digging force 96kN, bucket digging force 62kN;

Slewing speed 12.4rpm, walking speed 5.5km/h (high gear), climbing ability 70% (35° slope).

Operation range:

Maximum digging depth 5840mm, maximum digging height 8580mm, maximum digging radius of the parking surface 8430mm, suitable for complex terrain operations.

3. Structure and design features

Dimensions and stability:

Transport dimensions are 7590×2590×2970mm (length×width×height), track shoe width is 500mm, and ground contact pressure is low, ensuring stability in narrow space operations.

Cylinder configuration:

The design of boom cylinder (110×1015mm), dipper cylinder (120×1197mm), and bucket cylinder (100×939mm) enhances structural strength and durability.

4. Application scenarios and competitive advantages

Applicable fields:

Suitable for small and medium-sized projects such as earthwork excavation, pipeline laying, and municipal maintenance. The backhoe design takes into account both efficiency and precise control.

Competitiveness:

Efficient and energy-saving: Optimize the hydraulic system to reduce energy loss, and the fuel economy is better than the same tonnage equipment;

Easy maintenance: The layout of the hydraulic pipeline is simplified, and the coolant capacity is only 17.9L, which reduces the complexity of maintenance.