NIHON SPEED K1P Series Gear Pump | K1P1R11A K1P4R11A K1P10L11A | High-Pressure Hydraulic Pump

Chengyuan Hydraulic offers high-performance K1P Series gear pumps, meticulously engineered to serve as direct replacements for NIHON SPEED industry standards. Our lineup includes all major models such as K1P1R11A, K1P4R11A, K1P10L11A, and K1P12R11A. The K1P series is characterized by its high volumetric efficiency and compact aluminum construction. Chengyuan guarantees 100% Drop-in Interchangeability with original NIHON SPEED units regarding mounting flanges, shaft types, and port configurations. Backed by our 100% Simulation Load Testing, each pump is validated under a rated pressure of 21MPa to ensure zero leakage and stable flow output, providing a reliable and cost-effective alternative for high-end hydraulic machinery.

Technical Specifications 

• Compatible Brand: NIHON SPEED

• Model Codes: K1P1, K1P2, K1P3, K1P4, K1P6, K1P7, K1P9, K1P10, K1P12

• Displacement Range: 1.0 cm³/rev to 12.0 cm³/rev

• Rated Pressure: 21 MPa (210 Bar)

• Maximum Pressure: 24.5 MPa (245 Bar)

• Speed Range: 500 – 4000 r/min

• Rotation: R (Right/Clockwise) or L (Left/Counter-clockwise)

• Body Material: High-strength extruded aluminum alloy

• Temperature Range: -15°C to +80°C

Key Technical Advantages:

• Automatic Pressure Compensation: The K1P series utilizes a specialized side-plate pressure compensation design. This allows real-time adjustment of the clearance between the side plate and the gear face, maintaining a volumetric efficiency of over 95% even at 21MPa.

• Nitrid-Hardened Gear Pairs: Gears are manufactured from premium alloy steel with deep nitriding treatment. This ensures exceptional surface hardness and wear resistance, while micron-level machining precision reduces mechanical noise and pressure pulsation.

• Composite DU Bearings: High-load composite bearings provide superior self-lubricating properties under high-speed and heavy-load conditions, significantly extending the service life of the pump in high-frequency duty cycles.

• Reinforced Sealing System: Designed for the high-pressure environment of the K1P, the sealing system is heat-resistant and capable of withstanding instantaneous backpressure spikes, ensuring zero shaft leakage.

Application Areas:

• Industrial Automation: Compact hydraulic power units (HPU), machine tool clamping, and lift tables.

• Material Handling: Forklift steering systems, side-shifters, and electric pallet jack lift pumps.

• Municipal Machinery: Street sweeper brush drives, garbage compactors, and aerial work platform auxiliary circuits.

• Agricultural Equipment: Tractor hitch systems and harvester header lift controls.

Expert Maintenance Tips:

• Alignment Precision: When installing the coupling, always use a dial indicator to check the coaxiality between the motor and pump shafts. The deviation should be within 0.05mm to prevent premature shaft seal failure.

• Initial Startup Protocol: Fill the pump with clean hydraulic oil and rotate the shaft manually before the first run. Use “jogging” (on/off) during startup to bleed air until flow is steady before applying full load.

• Fluid Cleanliness: As a precision aluminum pump, the K1P series requires a 10μm filtration level. Maintain fluid cleanliness at NAS Class 9 or better to prevent scratches on the axial compensation plates.