I. Core Functions and System Role
As the core power component of the Kobelco SK60 excavator, the hydraulic pump converts the mechanical energy of the engine into hydraulic energy, providing power support for the entire hydraulic system. Its performance directly impacts the excavator's operational efficiency, fuel economy, and operational stability.
II. Technical Characteristics and Adaptive Scenarios
1. Power Matching:
The Kobelco SK60 excavator is equipped with a Yanmar 4TNV94L direct-injection engine, rated at 35.5 kW/2400 rpm. The hydraulic pump must precisely match the engine power to maximize energy conversion efficiency while avoiding overload damage.
2. System Design:
Some models adopt a new hydraulic third-pump combined flow system (IFPS), which combines the hydraulic oil from the third pump into the arm circuit to enhance arm movement speed and operational efficiency. This design also optimizes engine horsepower distribution, reducing energy waste.
3. Durability Requirements:
The hydraulic pump must adapt to the high-strength, lightweight steel construction of the excavator body to meet continuous operational demands. For example, the SK60-8 model reduces hydraulic pump load fluctuations and extends service life through reinforced arm and bucket cylinder oil pipe protection designs.
III. Model Classification and Performance Parameters
1. Main Pump Type:
The Kobelco SK60 series likely employs a swashplate-type axial piston pump, characterized by adjustable displacement and a wide pressure range (typically with a nominal pressure of up to 34 MPa), suitable for various working conditions.
2. Flow Rate and Pressure:
Taking the SK60-8 as an example, the main pump has a maximum flow rate of 2×57.1 L/min, supporting a maximum digging force of 40.1 kN (bucket) and 25.2 kN (arm), meeting the demands of excavation and loading operations.
3. Material and Structure:
The pump body is mostly made of cast iron, with key components such as pistons and port plates requiring high wear resistance to withstand high-pressure, high-frequency work cycles.
IV. Market Supply and Price Range
1. Original Parts:
Genuine Japanese hydraulic pumps are relatively expensive. For instance, a Kobelco SK60 hydraulic pump (produced in Japan) supplied by one vendor is priced between260and260 and 260and300, with potential discounts for bulk purchases.
2. Domestic Alternatives:
Domestic suppliers offer a variety of compatible pumps with a wide price range. For example, a company in Ningbo provides SK60 hydraulic pumps priced at approximately RMB 11,500 each (minimum order quantity: 1 unit), with prices dropping to RMB 10,000 per unit for bulk orders.
3. Parts Market:
A rich variety of hydraulic pump parts (such as piston shoes, port plates, and variable pistons) are available, with prices varying by model. For example, one supplier offers over 1,185 types of pump parts to meet repair and upgrade needs.
