KYB PSV2 Series Piston Pump | PSV2-55T PSV2-60T PSV2-63T | Hydraulic Main Pump for Excavator

The PSV2 Series hydraulic axial piston pumps by Chengyuan Hydraulic are specialized main pumps engineered for mobile construction machinery, particularly 6-to-8-ton excavators. Fully compatible with KYB (Kayaba) engineering standards, including models PSV2-55T, 60T, 62T, and 63T, these units provide 100% original-place interchangeability. The series features a tandem dual-pump configuration with advanced Load Sensing and Constant Power control systems, allowing for precise displacement adjustment based on operational load. Every PSV2 pump undergoes 100% simulated condition testing to guarantee rapid response, stable flow, and reliable performance in demanding digging and lifting cycles.

Technical Specifications :

• Model Range: PSV2-55T, PSV2-60T, PSV2-62T, PSV2-63T

• Displacement per Pump: $55.0\text{ cm}^3\text{/rev}$ to $63.0\text{ cm}^3\text{/rev}$

• Rated Operating Pressure: $24.5\text{ MPa (245 bar / 3550 psi)}$

• Peak Pressure: $30\text{–}34.3\text{ MPa (300–343 bar / 4970 psi)}$

• Rated Speed: $2000\text{–}2400\text{ rpm}$

• Control Type: Load Sensing (LS) / Constant Power Control

• Integrated Pilot Pump: $4.5\text{–}5.0\text{ cm}^3\text{/rev}$ gear pump included

• Structure: Tandem Dual Piston Pump

Key Technical Advantages:

• Compact Tandem Architecture: The PSV2 series integrates two rotary groups within a single high-strength cast-iron housing. This compact design saves critical space in the engine compartment and simplifies hydraulic plumbing with a shared inlet.

• Optimized Power Regulation: The built-in high-precision regulators facilitate cross-power sensing between the two pumps. If one circuit encounters heavy resistance, the regulator automatically reduces displacement to prevent engine stalling while maximizing total hydraulic output.

• Heavy-Duty Swashplate & Slipper Pairing: Designed for the high-impact nature of excavation, the swashplate undergoes surface hardening. This creates a stable hydrostatic oil film with the slippers, ensuring minimal wear even during continuous $24.5\text{ MPa}$ operation.

• Low Noise & Extended Service Life: Internal fluid passages are designed with noise-reduction notches to dampen pressure ripples. This significantly reduces operational noise within the excavator cabin and extends the fatigue life of internal components.

Application Areas:

• Mini & Compact Excavators: Primary power source for 6T, 7T, and 8T excavators (e.g., IHI, Takeuchi, Liugong).

• Drilling Rigs: Hydraulic systems for small-scale rotary drilling equipment.

• Forestry Machinery: Drive systems for harvesters and mobile hydraulic platforms.

Expert Maintenance Tips:

• Pilot Filtration: The PSV2 pump includes an integrated pilot pump. If pilot pressure becomes unstable, leading to sluggish movements, inspect and replace the pilot filter immediately.

• Inlet Vacuum Monitoring: Since both pumps share a common suction line, ensure the pipe diameter is sufficient and airtight. Poor suction leads to cavitation, which can destroy the cylinder block rapidly.

• Case Drain Flow: Periodically measure the flow from the case drain port. A significant increase in drain flow is a primary indicator of wear between the cylinder block and valve plate, signaling a need for preventive maintenance.