1. Product Overview
TheK3VG180is aswashplate-type axial piston variable-displacement pumpmanufactured byKawasaki Heavy Industries (Japan), belonging to theK3VG seriesof medium-to-large hydraulic pumps. Renowned for its high efficiency and reliability, this series is widely used in construction machinery, industrial equipment, and marine applications.
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2. Core Structure and Working Principle
(1) Structural Components
• Swashplate Axial Piston Design: Pistons are arranged axially, with displacement adjusted via changes in the swashplate angle.
• Variable Displacement Mechanism: Supports manual, hydraulic, or electro-hydraulic proportional control to meet diverse operational demands.
• Key Components:
• Piston Assembly: Precision-matched for low leakage and high volumetric efficiency.
• Port Plate: Bimetallic structure for wear resistance and cavitation resistance.
• Bearing System: Heavy-duty roller bearings to withstand axial and radial loads.
• Housing: High-strength cast iron for high-pressure applications.
(2) Working Principle
1. Suction Phase: The swashplate angle causes pistons to extend, drawing hydraulic fluid through the port plate’s suction port as the cylinder block rotates.
2. Discharge Phase: Pistons retract under swashplate pressure, forcing fluid out through the port plate’s discharge port to the system.
3. Variable Adjustment: Displacement is modified by altering the swashplate angle (manual/hydraulic/electro-hydraulic), adjusting piston stroke length.
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3. Key Performance Parameters
【表格】
Parameter K3VG180 Typical Value Explanation
Rated Pressure 28 MPa (continuous) Short-term peak pressure up to 35 MPa (confirm based on specific conditions).
Max Displacement 180 cm³/rev Infinitely adjustable from 0–180 cm³/rev via variable mechanism.
Speed Range 600–2000 rpm Minimum stable speed ≥800 rpm to avoid suction issues.
Volumetric Efficiency ≥92% (rated) Achieved through precision manufacturing to minimize leakage.
Total Efficiency ≥88% (rated) Optimized mechanical and volumetric losses.
Weight ~120 kg Includes oil; consider installation space load capacity.
Noise Level ≤78 dB(A) (1 m distance) Reduced pressure pulsation via optimized flow path design.
Applicable Fluid Mineral/synthetic oil (viscosity 10–400 cSt) Select viscosity based on temperature.
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4. Variable Control Modes
The K3VG180 supports multiple control types for system adaptability:
【表格】
Control Type Principle Applications
Manual Control Adjust swashplate angle via mechanical handle. Fixed displacement or simple debugging.
Hydraulic Control Use pilot pressure to drive variable piston, altering swashplate angle. Remote pressure control or pilot valve linkage.
Electro-Hydraulic Proportional Control Proportional solenoid outputs force proportional to current, driving variable mechanism. Closed-loop pressure/flow control (e.g., injection molding machines).
Pressure-Compensated Control Internal compensator adjusts displacement based on outlet pressure to maintain constant flow. Load-sensing systems (e.g., cranes, excavators).
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5. Typical Applications
(1) Construction Machinery
• Excavators: Power swing, travel, and boom movements under high loads and frequent starts/stops.
• Cranes: Hydraulic drive for luffing and winch mechanisms, requiring precise flow control.
• Concrete Pump Trucks: High-pressure, large-flow output for long-distance delivery.
(2) Industrial Equipment
• Injection Molding Machines: Electro-hydraulic proportional control for synchronized clamping, injection, and holding.
• Die-Casting Machines: High-pressure rapid filling with stable flow and pressure.
• Metal Rolling Mills: Continuous operation demands high reliability and low failure rates.
(3) Marine and Offshore Engineering
• Deck Machinery: Hydraulic drive for winches and anchors in corrosive saltwater environments.
• Steering Systems: Provide steering power with rapid response and low noise.
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6. Selection and Matching Guidelines
(1) System Requirement Matching
• Pressure Matching: Pump rated pressure ≥ system maximum working pressure (15–20% margin recommended).
• Flow Matching: Calculate required flow based on actuator speed and consider simultaneous operation factors.
• Speed Matching: Confirm motor/engine speed falls within pump range (600–2000 rpm).
(2) Control Mode Selection
• Open-Loop Systems: Manual or hydraulic variable pumps (low cost, limited precision).
• Closed-Loop Systems: Electro-hydraulic proportional pumps (require proportional amplifiers and sensors for high precision).
• Load-Sensing Systems: Pressure-compensated pumps (optimize energy use and reduce heat).
(3) Environmental Adaptability
• Temperature Range: Fluid temperature -20°C to +80°C; equip with coolers or heaters as needed.
• Contamination Control: Maintain fluid cleanliness ≤ NAS 6; replace filters regularly.
• Protection Grade: IP65 or higher for humid/dusty environments.
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7. Common Faults and Troubleshooting
【表格】
Symptom Possible Causes Solutions
Insufficient Flow Clogged suction filter, stuck variable mechanism, small swashplate angle. Clean filter, inspect variable piston, adjust angle.
Pressure Fluctuation Contaminated fluid, proportional valve signal interference, worn port plate. Replace fluid, shield signals, lap port plate.
Abnormal Noise Air ingestion, bearing failure, misaligned coupling. Vent system, replace bearings, realign coupling.
Severe Leakage Aged shaft seal, cracked housing, loose fitting. Replace seals, weld housing, tighten fittings.
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8. Maintenance Recommendations
• Daily Checks:
• Monitor fluid temperature (≤65°C recommended) and pressure gauge readings.
• Inspect couplings for vibration or noise.
• Periodic Maintenance:
• Every 500 hours: Replace suction filter, check fluid cleanliness.
• Every 2000 hours: Replace hydraulic oil (ISO VG46 anti-wear recommended), clean tank.
• Every 4000 hours: Check bearing clearance; replace if necessary.
• Long-Term Storage:
• Fill pump ports with rust inhibitor, rotate shaft to prevent seizure.
• Store in a dry, ventilated area away from direct sunlight.
K3VG180 Hydraulic Piston Pump Overview
The K3VG180 belongs to Kawasaki's K3V series of pumps. These pumps are typically **swashplate-type axial variable displacement piston pumps** and often come in a **duplex configuration** (two pump units in series), accompanied by a **pilot gear pump**. Their primary function is to supply high-pressure hydraulic fluid to the hydraulic systems of heavy machinery like excavators.
The "180" in "G180" usually indicates the pump's **displacement**, meaning the theoretical volume of fluid the pump can displace per revolution of the shaft. 180 signifies a displacement of approximately 180 milliliters per revolution (mL/rev). **The actual displacement may vary slightly depending on the specific design and control method.**
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Audited supplier
3 year
Address: Ningbo, China
Main Product:
hydraulic motor,
gear box,
hydraulic pump,
hydraulic valve ,
hydraulic winch,
hydraulic system
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