PSVL2-36CG-1 PSVL2-42-V Excavator Hydraulic Pump

Genlu Hydraulic excels as a world-class engineered fluid power component manufacturer, global B2B hydraulic systems specialist, and premium strategic supplier of high-pressure tandem axial piston pumps for mobile construction machinery fleets. The PSVL / PSVL2 Series High-Pressure Dual Axial Piston Variable Displacement Pump Platform (specifically covering premium frame variants PSVL2-36CG-1 and PSVL2-42-V) is purpose-engineered and manufactured as a 100% drop-in interchangeable high-tier alternative to the original Nabtesco / Kayaba (KYB) hydraulic main pumps utilized across global mini and midi crawler excavator fleets (extending to leading heavy-duty models such as Kubota KX161, U45, and U55). We manage automated high-precision CNC manufacturing cells and maintain deep global quick-ship warehouse inventory for high-frequency field replacement part numbers, including B0610-36001 and B0610-42018.

Operating as the primary multi-circuit fluid delivery core for compact hydraulic systems, the main pump must continuously distribute isolated high-pressure fluid vectors to the independent track drive motors, upper-structure slewing drives, and main boom/arm/bucket control valves via integrated Negative Flow Control (NFC) routing. During continuous rock excavation or synchronized trenching duty cycles, the pump assembly must withstand continuous severe pressure ratings (nominal 26 MPa, peak 30 MPa) while maintaining rapid swashplate dynamic response times. Genlu’s PSVL2 series pumps conform directly to original manufacturer technical product manual dimensions. We guarantee perfect drop-in retrofit compatibility across standard front mounting pilots, splined input drive shafts, and back-cap port blocks housing the integrated charge pilot gear pump and multi-stage regulator valve manifolds. Prior to final dispatch release, every single pump assembly undergoes 100% Full-Simulation Condition Testing to guarantee strict volumetric displacement synchronization and excellent thermal efficiency across both primary piston circuits.

Technical Specifications 

• Product Line: PSVL / PSVL2 Series High-Pressure Dual Axial Piston Variable Pump with Integrated Pilot Charge Gear Pump (100% cross-compatible with Nabtesco and Kubota excavator main pump standards)

• Core Covered Specific Configurations & Cross-Mapping:

  • PSVL2-36CG-1 Variant (Directly matching Kubota commercial ordering code: B0610-36001 / B061036001, optimized for Kubota KX161 chassis setups)

  • PSVL2-42-V Variant (Directly matching Kubota/universal midi-excavator ordering code: B0610-42018 / B061042018, optimized for upgraded high-flow variant utility machines)

• Primary Dual Piston Pump Displacement Matrix:

  • PSVL2-36 Specification: Dual variable piston pumps rated at 36.0 $cc/rev$ $\times$ 2

  • PSVL2-42 Specification: Dual variable piston pumps rated at 42.0 $cc/rev$ $\times$ 2

  • Rear Auxiliary Integrated Pilot Gear Pump: Rated at 4.5 $cc/rev$ to 6.0 $cc/rev$ standard

• Nominal Continuous Operating Pressure Boundaries: 26.0 MPa (260 bar / 3770 psi) continuous loading envelope

• Maximum Intermittent Intermittent Peak Pressure Bound: Rated up to 300 bar (30.0 MPa / 4350 psi) resisting transient machine breakout spikes

• Integrated Pilot Charge Gear Pump Delivery Pressure: Rated standard at 3.5 MPa to 4.0 MPa (35 bar – 40 bar)

• Maximum Permissible Input Drive Velocity: From 2200 rpm to 2400 rpm max rated rotational velocity

• Regulator Valve Control Manifold Profiles: Negative Flow Control (NFC) or electro-hydraulic proportional cross-sensing total power compensation, integrated with a protective pressure-cut-off limiter

• Primary Fluid Connection Port Profiles: Compliant with standard SAE high-pressure threaded patterns or standard split-flange center dimensions, ensuring a 100% drop-in retrofit to original hard-piping layouts

• Total Pump Assembly Dry Mass: Ranging from 32.0 kg (PSVL2-36) up to 36.5 kg (utilizing a compact aluminum-iron composite housing design)

Key Technical Advantages:

• Compact 3-in-1 Monoblock Architecture for Space Optimization: The PSVL2 features an integrated internal layout that stacks the dual piston rotary blocks, the rear pilot gear pump, and the dual-circuit regulator control valves within a single compact casing. This design reduces total axial length by over 30% compared to standard tandem inline pumps, saving space within compact excavator engine compartments and eliminating external interconnecting hoses that can leak.

• Cross-Sensing Total Power Compensation Control to Prevent Engine Stalling: The top-mounted control regulator utilizes a dual-spring cross-sensing feedback valve block. If a single working circuit experiences a sudden load spike (such as a single track hitting an obstruction), the regulator automatically senses the change and reduces the swashplate angle of the companion pump stage. This cross-compensation matches the combined hydraulic load to the engine’s torque curve, preventing engine lugging or stalling.

• 9-Piston Cylinder Group with Vacuum-Sintered Bimetal Valve Interfaces: The rotating cylinder barrel face features a high-strength ductile iron base vacuum-sintered with a specialized anti-friction bronze alloy layer. This bimetal structure supports smooth high-speed slipper actuation across the swashplate, offering high resistance to particle scoring and maintaining a volumetric efficiency above 94% under continuous 26 MPa operation.

• Dual-Acting Servo Pistons for Rapid Swashplate Shifting Response: The internal variable servo pistons are induction-hardened and precision-ground to minimize shifting friction. Paired with high-flow pilot control channels in the regulator, the swashplate achieves a full-stroke step response time under 50 ms. This fast response provides linear, responsive hydraulic performance during synchronized boom, arm, and bucket movements.

Application Areas:

• Compact Utility & Midi Crawler Excavators: Main hydraulic power core for Kubota KX161, KX155, U45, and U55 excavator models, as well as utility platforms utilizing Nabtesco or KYB 4-ton to 6-ton class main pumps.

• High-Performance Skid Steer Loaders & Compact Drill Rigs: Dual-track drive power for heavy skid steers, trenchless horizontal directional drilling (HDD) pilot systems, and compact geotechnical anchor rigs.

Expert Maintenance Tips:

• Monitor Rear Pilot Charge Pump Pressures to Ensure Control System Responsiveness: The integrated rear gear pump (delivering 3.5–4.0 MPa) supplies the essential control fluid for the pilot joy-sticks (PPC valves) and the main pump regulator servo pistons. If this charge pump wears internally and output drops below 2.8 MPa, the main pump regulators will fail to stroke properly, resulting in sluggish machine movements or an inability to build system flow. Always verify pilot charge pressures during diagnostic routine checks.

• Verify Vacuum Tightness of the Main Suction Line to Prevent Cavitation Pitting: Because mini excavators regularly work on steep slopes, any minor degradation or loose hose clamps along the main suction line can pull air into the high-velocity intake loop. These micro-bubbles collapse violently in the high-pressure zone, causing rapid cavitation pitting across the bimetal valve plate. Always replace the main suction hose clamps with heavy-duty T-bolt clamps during pump service.

• Perform a Comprehensive Hydraulic Loop Flush Prior to New Pump Installation: When replacing an original failed pump (such as a damaged B0610-36001 or B0610-42018), fine metallic debris from the failure remains trapped throughout the system. Before commissioning the new pump, flush all hydraulic cylinders, the main control valve blocks, and track motor lines. Thoroughly clean the reservoir and install fresh return and pilot filter elements, maintaining oil cleanliness at or above ISO 4406 19/16 or NAS 8.