Product Overview
The PSV2 Series is a swashplate-type axial piston variable displacement pump manufactured by KYB (Kayaba Corporation). The PSV2 Series features a tandem dual-pump configuration—two independent pump sections integrated on a single drive shaft, providing simultaneous oil supply to both the travel and working hydraulic circuits. This series is widely used in the hydraulic systems of JCB, Sumitomo, and other mid-class excavators.
The series covers PSV2-52T, PSV2-55T, PSV2-60T, PSV2-62T, PSV2-63T, and PSV2-66T-1 models, with displacements ranging from 52 cm³/rev to 66 cm³/rev. The suffix “T” denotes the tandem dual-pump configuration.
The PSV2-60T model (part numbers 20640-44021 / 20640-44020) is the flagship model of the series, delivering a displacement of 60 cm³/rev. It is installed on JCB JS160W wheeled excavators and Sumitomo SH120 excavators. JLJ0231 is the corresponding JCB cross-reference part number.
As a direct OEM-equivalent replacement solution for the KYB PSV2 Series, this product offers complete in-situ interchangeability, strictly adhering to KYB’s original design specifications and mounting interface standards. Every unit undergoes 100% simulated duty-cycle testing, ensuring that key performance metrics—including volumetric efficiency, pressure-flow characteristics, and case drain flow at rated pressure and full displacement—meet or exceed original factory specifications.
Technical Specifications
Product Series: KYB (Kayaba) PSV2 Series
Pump Type: Swashplate Axial Piston Variable Displacement Pump (Open Circuit)
Configuration: Tandem Dual-Pump — two sections on a single shaft
Displacements by Model:
PSV2-52T / PSV2-52: Approx. 52 cm³/rev
PSV2-55T: Approx. 55 cm³/rev
PSV2-60T / PSV2-60: 60 cm³/rev
PSV2-62T / PSV2-62: Approx. 62 cm³/rev
PSV2-63T / PSV2-63: Approx. 63 cm³/rev
PSV2-66T / PSV2-66T-1: Approx. 66 cm³/rev
Maximum Operating Pressure: Up to 300 bar+
Rated Operating Pressure: Up to 250 bar
Maximum Speed: Up to 3000 rpm
Housing Material: Cast Iron
Control Type: Variable Displacement Control (flow regulator, pressure valves, overload protection)
Operating Temperature Range: -20°C to +90°C (typical)
Weight: Approx. 100 kg (PSV2-52T)
Key OEM Part Numbers:
JCB Cross-Reference: JLJ0231 (PSV2-60T)
Key Technical Advantages
1. Tandem Dual-Pump Design — Two Circuits, One Shaft
The “T” suffix in the PSV2 Series denotes the tandem configuration—two independent pump sections mounted on a single drive shaft, driven by a single power source. This design enables a single pump to supply both the travel and working hydraulic circuits simultaneously, significantly simplifying excavator hydraulic system layouts and reducing installation space requirements and system costs.
2. High Pressure Rating with Excellent Shock Resistance
The PSV2 Series delivers a maximum operating pressure of up to 300 bar+ . The high-strength cast iron housing with precision-machined components ensures long-term reliable operation under heavy-duty excavating, breaking, and other demanding conditions.
3. Variable Displacement Control for On-Demand Flow and Energy Savings
The PSV2 Series features variable displacement control with built-in flow regulators, pressure valves, and overload protection. Pump output flow automatically adjusts to match load demand, delivering on-demand oil supply that effectively reduces overflow losses and fuel consumption.
4. Compact Design with Low-Noise Operation
The PSV2 Series features a compact structural design that delivers high power density within a limited footprint. Optimized internal flow paths and precision fits ensure low-noise operation, significantly improving the operator’s working environment.
5. Broad OEM Compatibility with Global Interchangeability
The PSV2 Series is widely compatible with JCB, Sumitomo, Link-Belt, and other excavator brands. Key compatible models include JCB JS110/JS130/JS130W/JS145/JS150/JS150LC/JS150W/JS160/JS160W/JS180/JS180W and Sumitomo SH120/SH130/SH160. Multiple OEM part number cross-references enable flexible selection based on inventory and procurement channels.
Application Areas
JCB Crawler Excavators: JS110, JS130, JS145, JS150, JS160, JS180
JCB Wheeled Excavators: JS130W, JS145W, JS150W, JS160W, JS180W
Sumitomo Crawler Excavators: SH100, SH120, SH130, SH160
Link-Belt Excavators: LS2650, etc.
Case Excavators: 9020B, etc.
Other Mid-Sized Excavators: Fits approximately 10–16 ton class excavator hydraulic systems
Expert Maintenance Tips
Model Confirmation & Pre-Installation Inspection: Prior to installation, confirm the complete model code (e.g., PSV2-52T / PSV2-55T / PSV2-60T / PSV2-62T / PSV2-63T / PSV2-66T-1) and corresponding OEM part number. Verify that the mounting flange specification and splined shaft type match the host machine PTO interface. The pump weighs approximately 100 kg—ensure lifting equipment has adequate capacity. Manually rotate the shaft before installation to confirm smooth, obstruction-free rotation.
Fluid Cleanliness Control: Use high-quality hydraulic oil meeting KYB specifications. A minimum filtration rating of ISO 18/15 is recommended. The PSV2 Series’ tandem dual-pump design means both pump sections share the same housing oil—contamination affects both circuits simultaneously. Complete system flushing is mandatory before initial start-up.
Variable Displacement Controller Tuning: The PSV2 Series features built-in flow regulators and pressure valves. During commissioning, set the compensator pressure value and flow characteristics based on the host machine’s hydraulic system design. Perform initial settings under no-load conditions, then gradually increase load to target operating conditions with fine adjustments.
Initial Start-Up & Priming: Before first start-up, pre-lubricate the pump by filling the housing with clean hydraulic fluid through the case drain port. Perform a brief jog start (5–10 seconds) to check for abnormal noise, leakage, or excessive vibration. Then start the pump and run at low load for several minutes to purge air from the pump and both circuit lines. Both circuits must be individually purged.
Case Drain Port Positioning & Pressure Monitoring: During installation, ensure the drain port is positioned higher than the pump body to prevent oil starvation in the pump chamber after shutdown. The tandem dual-pump design has higher case drain flow—ensure the drain line has adequate diameter to avoid excessive back pressure.
Scheduled Maintenance & Filter Replacement: Follow the maintenance intervals specified in the KYB PSV2 Series service manual. Pay particular attention to filter condition, fluid cleanliness, and seal integrity during routine inspections. Regular hydraulic fluid and filter replacement is essential for long-term reliable pump operation. The PSV2 Series’ tandem dual-pump design means more internal rotating components, demanding higher maintenance quality.
