KYB PSVL2-27CG PSVL-42CG PSVL-54CG Piston Pump for Kubota

The PSVL / PSVL2 series (including premium compact multi-circuit variable displacement axial piston pumps such as PSVL2-27CG, PSVL2-36CG, PSVL-42CG, PSVL-54CG, and PSVL-84, centered around the high-demand technical execution PSVL-54CG-14 with OEM cross-reference part number B0610-54008) manufactured by LIC Hydraulic are single-shaft integrated multi-flow rotary power systems custom-engineered for compact track excavators (including Kubota KX151, KX153, KX155, KX161, and KX165 series). Conforming strictly to standardized rectangular pilot mounting flanges, split multi-flow service outlets, standard splined input drive shafts, and pilot pressure regulatory valve curves, this entire product line provides 100% drop-in interchangeability with Japan Kayaba (KYB) original factory PSVL main hydraulic pumps.

Mini and midi hydraulic excavators operate under high-frequency composite control actions, fluctuating trenching resistance, and severely restricted cooling environments. If the core main pump lacks sufficient volumetric or mechanical efficiency, the excavator will experience severe hydraulic sluggishness, engine stalling, or speed drop when multi-functioning travel, swing, and boom circuits simultaneously. LIC solves these operational weaknesses by optimizing the tribological matrix of the internal piston rotating groups and precision-calibrating the constant power control valves. Every single PSVL multi-circuit piston pump undergoes 100% full-load factory testing that replicates authentic construction excavation, hydraulic breaker impacts, and maximum composite relief-stalling configurations before delivery. Maintaining precise structural stability and steady fluid delivery under elevated pressures, our pumps offer a dependable procurement alternative for global B2B machinery spare parts distribution networks and fleet overhaul workshops.

Technical Specifications

Accurate, catalog-verified technical engineering parameters in compliance with standard KYB PSVL / PSVL2 series technical benchmarks and Kubota parts manuals (specifically for PSVL-54CG-14 / B0610-54008):

• Product Series: PSVL / PSVL2 Series Swashplate Variable Axial Piston Main Pump Platform for Compact Excavators (With Integrated Rear Pilot Gear Pump)

• Displacement Sizing Framework Categories:

  • PSVL2-27CG: Dual piston main flow output of 27.0 cm³/rev × 2.

  • PSVL2-36CG: Dual piston main flow output of 36.0 cm³/rev × 2.

  • PSVL-42CG: Dual piston main flow output of 42.0 cm³/rev × 2.

  • PSVL-54CG: Dual piston main flow output of 54.0 cm³/rev × 2 (Core specification item: PSVL-54CG-14).

• Model Number Specification Code Breakdown (PSVL-54CG-14 / B0610-54008):

  • PSVL: Index designation for compact swashplate axial piston excavator primary pumps.

  • 54: 54.0 cm³/rev geometric displacement classification scale for each of the dual variable rotating groups (Front Pump + Rear Pump).

  • CG: Control methodology code, indicating combined total power regulatory sensing (Total Power Control) integrated with negative flow feedback loops (Negative Flow Control), managed via pilot-operated proportional valves.

  • 14: Specific iteration index matching oil port configurations and spring tuning for Kubota KX161-3 / KX155 chassis layouts.

  • B0610-54008: Cross-reference matching original Kubota factory replacement part numbering.

• Rear-Integrated Auxiliary Pump: Factory assembled with 1 high-pressure auxiliary gear pump (Typically ranging from 10 cc/rev to 15 cc/rev for pilot supply and auxiliary attachment circuits).

• Main Piston Pump Rated Operating Pressure: 245 bar (24.5 MPa / 3550 psi)

• Main Piston Pump Intermittent Peak Pressure: 294 bar (29.4 MPa / 4260 psi)

• Integrated Pilot Gear Pump Working Pressure: 35 bar to 49 bar

• Maximum Self-Priming / Matching Rated Velocity: 2200 rpm – 2400 rpm

• Regulatory Control Characteristics: Total power summation capability prevents diesel engine lugging and stalling by managing torque limits across both piston groups.

• Net Individual Mass Weight: PSVL-54CG frame configuration approx. 38.5 kg (84.8 lbs).

Key Technical Advantages

• Single-Shaft Double-Pump Inline Architecture: The PSVL platform consolidates dual-flow delivery into a highly compact frame by positioning two independent 9-piston rotating groups back-to-back on a single central drive shaft. This design reduces overall length by more than 35% compared to conventional split-housing pumps, ensuring synchronized torque transfer and preventing excavation track drift during high-load operations.

• Responsive Cross-Sensing Total Power Regulatory Valve Block: The integrated controller features micro-honed valve spools that continuous monitor system pressure fluctuations. When load resistance spikes in either hydraulic circuit, the cross-sensing network signals the opposite pump to destoke, limiting total torque absorption within the diesel engine’s power band to prevent stalling during heavy operations.

• Nitride-Hardened Valve Plates & Bi-Metal Piston Slippers: To withstand elevated oil temperatures common in compact excavators with smaller reservoir capacities, LIC constructs the cylinder-to-plate interfaces out of sintered bi-metal copper alloy. The steel valve plates undergo an advanced ion gas nitriding process to maximize surface hardness, preserving a stable boundary lubrication film even at 80°C continuous operation.

• Rear-Integrated High-Pressure Pilot Gear Pump Assembly: The rear end-cover features a directly integrated gear pump that eliminates external connecting lines. This auxiliary unit delivers a stable, pulse-free 4.0 MPa pilot supply line to ensure smooth, responsive control block spool activation without dead-zones.

Application Areas

The PSVL2-27CG, PSVL-42CG, and PSVL-54CG-14 high-power-density variable piston pumps provide high performance and fine positioning accuracy across compact utility machinery installations:

• Compact Tracked Utility Hydraulic Excavators: Direct replacement for main hydraulic pumps on Kubota KX151, KX153, KX155, KX161, and KX165 mini and midi crawler excavators.

• Compact Foundation Drilling Rigs & Mini-Piling Units: Supplying multi-flow power to rotary drill heads and auxiliary positioning jacks on urban construction platforms.

• Hydrostatic Compact Track Loaders & Specialized Transport Machinery: Serving as the primary dual-circuit variable pump assembly managing machine tracking and attachment handling configurations.

Expert Maintenance Tips

• A Complete System Flush and High-Efficiency Filter Replacement is Mandatory Prior to Installation: When a factory excavator pump experiences mechanical failure (such as piston scuffing or slipper fracture), thousands of micro-sized hard metallic shaving fragments are generated and deposited throughout the control valves, cylinders, and hose lines. If you mount a replacement pump without conducting a thorough system flushing procedure, these residual metal fragments can be drawn straight into the new rotating group upon startup, causing severe scoring or catastrophic breakdown within minutes.

• Manually Pre-Fill the Casing and Exclude Air Before Starting Engine: Before starting a newly installed pump assembly (such as PSVL-54CG-14), remove the topmost case drain or bleed plug on the housing and fill the internal cavity with clean anti-wear hydraulic oil. After filling, do not start the engine immediately. Turn the engine flywheel manually for several revolutions to distribute oil across the journal bearings and swashplate sliding pads. Start the engine and run it at low idle speed (approx. 1000 rpm) for 5 to 10 minutes to clear any trapped air bubbles before applying load.

• Inspect the Suction Hose Assembly for Micro-Aeration Defects: The high self-priming velocities of the PSVL series generate sustained negative pressures across the intake line. Due to high vibration levels and harsh working conditions, excavator suction hoses can develop micro-cracks or experience loose clamp connections. If air is drawn into the suction line, the resulting bubble implosions (cavitation) will cause loud high-pitch screaming and heavy vibration, accelerating wear on internal components. Check suction line sealing integrity every 250 operational hours.