Mini Excavator Piston Pump MVP30.23D-04S5-LMD | Tandem Hydraulic Pump

The MVP30.23D-04S5-LMD axial piston pump series produced by Chengyuan Hydraulic is a high-performance tandem hydraulic power source specifically developed for 2.5-ton to 3.5-ton mini excavators. This model delivers exceptional power density, tailored to the compact spatial layouts and rapid response requirements of modern micro-excavators.

As a critical power component, Chengyuan’s MVP30 series ensures 100% original-place interchangeability concerning flange dimensions, shaft extension parameters, and port configurations. We guarantee that every unit passes 100% simulated load testing under actual digging conditions. This ensures stable flow output and precise control even under extreme digging pressures, making it a reliable choice for both aftermarket replacement and OEM supply.

Technical Specifications 

• Model Number: MVP30.23D-04S5-LMD

• Pump Type: Tandem Axial Piston Pump

• Geometric Displacement: 23 $cm^3/rev$ + 23 $cm^3/rev$

• Rated Operating Pressure: 210 bar (21 MPa)

• Peak Operating Pressure: 250 bar (25 MPa)

• Rated Speed: 2200 – 2600 rpm

• Maximum Speed: 3000 rpm

• Control Type: LMD (Load Sensing & Power Control)

• Shaft Specification: 11-Tooth Spline Shaft

• Target Machine: 2.5 – 3.5 Ton Mini Excavator

Key Technical Advantages:

• Independent Tandem Distribution: Utilizing a dual-cartridge structure where two 23cc pump sets share a single drive shaft. This provides perfect power distribution for travel, swing, and boom functions, ensuring smooth simultaneous movements without interference.

• Load Sensing (LMD) Precision: The integrated LMD feedback mechanism automatically adjusts the swashplate angle according to the load pressure. This “power-on-demand” feature significantly reduces system heat, improves fuel economy, and provides the operator with superior tactile feedback.

• High-Density Ductile Iron Cylinder: The cylinder is forged from high-strength ductile iron with specialized heat treatment. Its hardness and wear resistance are significantly higher than standard castings. Paired with precision-lapped piston shoes, it maintains peak volumetric efficiency under high pressure.

• Silent Bearing & Anti-Vibration Design: Equipped with high-precision, high-capacity bearings reinforced against frequent switching shocks. By optimizing swashplate damping, we significantly reduce hydraulic pulsation and high-frequency noise, enhancing the cabin environment.

Application Areas:

• Mini Excavators: Compatible with various 3-ton class international and domestic excavator brands.

• Small Crawler Machinery: Including crawler drills, orchard management machines, and specialized dredging equipment.

• Compact Skid Steer Loaders: Providing high-pressure power for travel systems.

Expert Maintenance Tips:

• Mandatory Initial Bleeding: After installation, the pump case must be filled with clean hydraulic oil through the air vent port. Manually rotate the shaft to ensure all air is purged. Never start the pump dry; otherwise, the pistons will suffer instant seizure.

• Fluid Cleanliness Management: Mini excavator systems are highly sensitive. Maintain oil at ISO 4406 18/16/13 standards and replace return filters regularly. Small particles can cause the LMD compensator valve to stick.

• Suction Hose Inspection: Ensure the suction hose is not aged or collapsed. Restricted suction causes cavitation, leading to abnormal noise and metal fatigue spalling within the pump body.