Model Number: 708 - 3T - 00151
Applicable Model: PC78MR - 6 Excavator
Function: As a piston main pump, it is a crucial component of the excavator's hydraulic system. It is responsible for pressurizing and supplying hydraulic fluid to various hydraulic actuators such as the boom, arm, and bucket cylinders, enabling the precise and powerful movements of the excavator.
2. Performance Specifications
2.1 Flow Rate
Rated Flow: The rated flow rate of this hydraulic pump is [X] liters per minute (L/min). This value represents the normal flow of hydraulic fluid that the pump can deliver under standard operating conditions, which directly affects the speed of the excavator's movements.
Variable Flow Range: The pump may have a variable flow control mechanism. The minimum flow rate can reach [Y] L/min, and the maximum flow rate can be up to [Z] L/min. This variable flow allows for different working speeds and power requirements, enabling the excavator to perform a variety of tasks, from delicate operations to heavy - duty digging.
2.2 Pressure Ratings
Rated Pressure: The rated working pressure of the pump is [P1] megapascals (MPa). At this pressure, the pump can operate continuously and efficiently, ensuring the reliable transfer of hydraulic energy to the actuators.
Peak Pressure: The pump is capable of withstanding a peak pressure of [P2] MPa for short - term, high - load situations. However, continuous operation near or at the peak pressure may reduce the pump's service life and increase the risk of damage to other hydraulic components.
3. Construction and Components
3.1 Pump Type
Piston Pump: The 708 - 3T - 00151 is a piston - type hydraulic pump. Piston pumps are known for their high - efficiency and ability to generate high pressures. The pistons move in a reciprocating motion within the cylinders to draw in and discharge hydraulic fluid.
Cylinder Block: The cylinder block is a vital part of the pump, typically made of high - strength, wear - resistant materials such as alloy steel. It provides a precise housing for the pistons and is machined to ensure accurate piston movement and proper sealing.
Pistons: The pistons are usually made of hardened steel, designed to fit snugly within the cylinders. Their dimensions and surface finish play a crucial role in minimizing internal leakage and maximizing pumping efficiency.
Valve Plate: The valve plate contains the inlet and outlet valves that control the flow of hydraulic fluid. It is made of a durable material and is designed to ensure precise and reliable valve operation, allowing for efficient fluid transfer.
3.2 Sealing System
The pump is equipped with a high - quality sealing system to prevent hydraulic fluid leakage. The seals are made of special elastomeric materials that are resistant to the hydraulic fluid used and can withstand the high - pressure environment. The seals are located at critical points such as around the pistons and at the pump housing joints.
