K1P Series NIHON SPEED Hydraulic Gear Pump | K1P1R K1P3R K1P6R K1P10R | External Aluminum Pump

The K1P Series Hydraulic Gear Pumps by Chengyuan Hydraulic are high-performance aluminum external pumps engineered specifically for compact hydraulic power units (HPU) and mobile machinery. Built as a precision alternative to NIHON SPEED standards, our K1P series ensures 100% original-place interchangeability for models ranging from K1P1 to K1P10. Utilizing high-tensile extruded aluminum alloy and precision-ground gears, these pumps are 100% simulation tested to guarantee OEM-level performance in pressure resistance and volumetric efficiency, providing a seamless and cost-effective replacement for Japanese-sourced gear pumps.

Technical Specifications (Bulleted List)

• Model Series: K1P1, K1P2, K1P3, K1P4, K1P6, K1P7, K1P9, K1P10 (R11A/L11A)

• Displacement Range: $1.0$ to $10.5\text{ cm}^3\text{/rev}$

• Rated Pressure: $21\text{ MPa (3045 psi)}$

• Peak Pressure: $25\text{ MPa (3625 psi)}$

• Max Speed: $4000$ to $6000\text{ RPM}$ (varying by displacement)

• Rotation: Right (CW) or Left (CCW)

• Shaft Options: $1:8$ Tapered Shaft (11A) or Straight Keyed Shaft

• Port Connections: Flange or Threaded ports (JIS compliant)

• Volumetric Efficiency: $\ge 95\%$

Key Technical Advantages

• High-Speed Reliability: Engineered for high-frequency operations, the K1P series maintains low cavitation risk and fluid noise even at speeds up to $6000\text{ RPM}$ due to its optimized flow channel and lightweight aluminum housing.

• Axial Pressure Balancing: The internal design features pressure-compensated side plates that adjust clearances automatically according to the output pressure, maximizing Volumetric Efficiency and minimizing internal leakage over the pump’s lifespan.

• Superior DU Bearing Support: Equipped with premium self-lubricating DU bushings that offer high load capacity and anti-fatigue properties, providing stable radial support for the gears under high-pressure and high-temperature conditions.

• Precision-Ground Gear Sets: Utilizing nitrided high-strength steel with super-finish grinding, the gear engagement is ultra-smooth, resulting in minimal pressure ripples and significantly reduced system vibration.

Application Areas

• Material Handling: Steering pumps for forklifts and lift pumps for stackers.

• Automotive Hydraulics: Tail-lift mechanisms and dump truck power units.

• Industrial Machinery: CNC lubrication systems, compact hydraulic stations, and auxiliary plastic processing equipment.

Expert Maintenance Tips

• Pre-Startup Priming: Always fill the pump with clean hydraulic oil through the suction port before the first run. Jog the motor under no-load conditions to bleed air and prevent dry-running damage.

• Filtration Integrity: The K1P series is sensitive to particulate contamination. To protect the precision side plates, maintain system filtration at $20\text{ }\mu\text{m}$ or better.

• Alignment Precision: Ensure the drive coupling is perfectly aligned. Misalignment exceeding $0.05\text{ mm}$ can induce excessive radial loads, leading to premature shaft seal failure.