Kawasaki K3VL Series Axial Piston Pump | K3VL45 K3VL112 K3VL140 Variable Displacement

The K3VL Series swashplate-type axial piston variable displacement pumps manufactured by Chengyuan Hydraulic are high-efficiency fluid power generation modules fully engineered to match global Kawasaki industrial and heavy-duty excavator benchmarks. Developed for open-circuit hydraulic networks demanding high power density, superior self-priming limits, and quick control responses, this series covers a comprehensive displacement spectrum: from the compact K3VL28 and K3VL45 (including the specific excavator attachment configuration K3VL45/B-10RKS-PO), through the mid-range K3VL63, K3VL80, and K3VL112, up to the heavy-duty powerplants K3VL140 and K3VL200. The designation K3VL45/B-10RKS-PO indicates a Series B reinforced cylinder frame, 10 design sequence, right-hand clockwise rotation (R), a parallel keyed drive shaft (K), premium NBR elastomer seals (S), and the highly sensitive PO module (Pilot-Operated with Power Control/Torque Limiting). Every single K3VL pump undergoes 100% digital test-bench validation for high-speed self-priming thresholds, excavator-simulated heavy-shock relief cycles, controller responsiveness dead-band tracking, and housing case pressure seal compliance prior to shipment to match official performance curves, delivering proven 100% original-place interchangeable compatibility.

Technical Specifications :

• Core Product Framework: Kawasaki K3VL Series Template Swashplate Axial Piston Variable Open-Circuit Pumps

• Displacement Family Matrix: K3VL28 / K3VL45 / K3VL63 / K3VL80 / K3VL112 / K3VL140 / K3VL200

• Target Customized Identification: K3VL45/B-10RKS-PO

• Geometric Volumetric Displacements:

  • K3VL28 Profile: 28 $cm^3/rev$

  • K3VL45 Profile: 45 $cm^3/rev$

  • K3VL80 Profile: 80 $cm^3/rev$

  • K3VL112 Profile: 112 $cm^3/rev$

  • K3VL140 Profile: 140 $cm^3/rev$

  • K3VL200 Profile: 200 $cm^3/rev$

• Operational Pressure Envelopes:

  • Full Series Nominal Continuous Rating: 320 bar (32 MPa / 4640 psi)

  • Intermittent Maximum System Peak Limit: Reaches up to 350 bar (35 MPa / 5075 psi)

• Maximum Self-Priming Speeds (at 0 bar gauge/1 bar absolute inlet condition):

  • K3VL45 Parameters: Maximum self-priming speed reaches up to 2700 rpm

  • K3VL112 Parameters: Maximum self-priming speed reaches up to 2200 rpm

  • K3VL200 Parameters: Maximum self-priming speed reaches up to 1900 rpm

• Mounting Interface & Input Shaft Configuration (e.g., K3VL45-RKS):

  • Mounting Flange: Standard combinations matching SAE 2-bolt or 4-bolt spacing matrices.

  • Shaft Extension: Code K parallel cylindrical keyed shaft (involute splined profiles available).

• Displacement Variable Control Type (PO): Integrated Pilot-Operated Pressure Compensator paired with a Total Power/Constant Torque Regulator (automatically adjusting displacement based on torque demand to prevent engine stalling).

• Volumetric Efficiency Baseline: Reliably rated at $\ge 95\%$ under continuous high-pressure operations.

Key Technical Advantages:

• Superior Self-Priming Limits with Specialized Spherical Valve Plates: The K3VL series features an high-speed intake capability. The high-tensile ductile iron pump body utilizes an optimized internal flow gallery paired with Kawasaki’s signature spherical valve plate architecture. As the cylinder indexes at high speeds, fluid flow resistance into the piston bores drops by 25% compared to conventional flat-plate designs, preventing cavitation scoring during high-RPM cold starts.

• 9-Piston Rigid Rotator Grid with Hydrostatically Balanced Bimetallic Shoes: The rotating cylinder block is engineered from high-thermal-conductivity bronze sintered onto a structural steel core, housing 9 high-strength alloy pistons fitted with abrasion-resistant slippers. Internal oil paths inject fluid directly to the shoe faces to maintain a precise hydrostatic lubricating film. This prevents metal-to-metal boundary friction under continuous 320 bar cycling, extending operational wear life by 1.5 times.

• Modular High-Response PO Energy-Saving Control Governor: The K3VL45/B-10RKS-PO manifold integrates a pilot-operated pressure control pilot linked to a constant-torque regulator piston. The high-sensitivity control core quickly registers downstream pressure adjustments. If system torque demand approaches the engine’s power limits, the PO module adjusts the swashplate angle within 40 milliseconds ($\text{ms}$), delivering effective power management for excavator tool circuits.

• 100% Torque Capacity Through-Drive Configuration: Every pump in the K3VL matrix features a robust, full-torque through-drive rear interface. This allows operators to easily tandem-mount a secondary piston pump, high-pressure gear pump, or auxiliary pilot supply unit directly onto the main shaft end, eliminating complex external splitter gearboxes and saving engine compartment space.

Application Areas:

• Mobile Construction Machinery & Hydraulic Excavators: Main or auxiliary variable pump units for mid-to-mini crawler excavators, rotary piling rigs, heavy loader platforms, and forestry grapples.

• Excavator Hydraulic Demolition Attachments: Dedicated hydraulic power supplies for high-frequency concrete breakers, demolition pulverizers, shears, and multi-jaw sorting sorting grabs.

• Marine Deck Machinery & Heavy Plant HPUs: Main fluid power drives for marine cargo cranes, offshore heavy-duty winches, and metal forging manufacturing lines.

Expert Maintenance Tips:

• Mandatory Cavity De-Aeration and Lubrication Priming Prior to Startup: The high-speed rotating groupings and journal bearings of the K3VL series depend entirely on the fluid pool within the pump housing for cooling and lubrication. After mounting, you must fill the pump casing with clean, matching hydraulic oil via the highest drain port near the front shaft extension, and turn the shaft by hand to clear air from the servo cavities. Dry-cranking the unit will score or weld the cylinder-to-plate copper interface within the first 3 seconds of activation.

• Enforce Low Case Drain Line Backpressure Limits ($\le 1\text{ bar}$): Because models like the K3VL45 utilize tight-tolerance rubber shaft seals, the case drain line must feature an oversized diameter and run directly back to the reservoir below the oil line, completely isolated from main return manifolds or check valves. Maintain an active running case pressure below 1 bar. Restricting case drainage will cause the front shaft seal lip to leak or fail, disrupt the balance across the servo adjustment pistons, and lead to a locked swashplate control failure.

• Implement High-Efficiency Filtration and Halved Fluid Service Intervals for Breaker Operations: When the K3VL pump supplies a hydraulic concrete breaker, the rapid mechanical impact forces high-density microscopic metal particulates and broken polymer seal strands into the system. You must install an impact-resistant, high-efficiency filtration element on the return line and shorten the hydraulic oil and filter service intervals from 2,000 standard operating hours down to 500–800 hours. Failure to filter these particles will score the K3VL valve plate, causing a sharp drop in volumetric efficiency.