Product Overview
The K1P1R11A, K1P6R11A, K1P7R11A, and K1P10R11A series high-pressure gear pumps originate from Japan’s NIHON SPEED K1P Series external gear pump platform, manufactured under license from Italy’s Marzocchi Pompe. NIHON SPEED is a well-known Japanese manufacturer of hydraulic components, and its K1P Series gear pumps are recognized for high pressure, lightweight aluminum construction, and excellent durability, making them ideal for hydraulic systems in various industrial machinery and mobile equipment.
This series features external gear pump construction with a high-strength aluminum alloy body, consisting of a gear pair supported by two special low-friction, high-resistance aluminum bushings. Displacements cover 1 – 10.5 cc/rev (with 12 cc/rev also available). The product offers excellent durability, having passed one million impact fatigue tests at 24.5 MPa.
The K1P Series pumps are available with integral relief valves (V suffix models), in single or bi-rotational configurations, and support single or tandem pump setupswith a variety of flange, shaft, and port configuration options.
Key Interchangeability Advantage: Our K1P series gear pumps are manufactured to strict Japanese NIHON SPEED / Italian Marzocchi original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces (flange/foot mounting), shaft configurations, and port positions are identical to the original product – no modifications required. Every pump undergoes 100% factory performance testing under simulated operating conditions (covering rated pressure, peak pressure, and full speed range performance curves), guaranteeing plug-and-play reliability with zero performance deviation.
Model Code Breakdown (based on NIHON SPEED K1P Series designation rules):
K1P = Series: Fixed-Displacement Gear Pump
1 / 6 / 7 / 10 = Size code (displacement, refer to specification table)
R = Rotation direction: Clockwise (viewed from shaft end) (L = Counter-clockwise)
11A = Design number
V (optional) = Integral relief valve (e.g., K1P6RV11A)
F (optional) = Flange mounting (no mark = foot mounting)
Technical Specifications
K1P Series – General Specifications
Product Series: NIHON SPEED K1P Series High-Pressure External Gear Pump
Brand: NIHON SPEED (Japan)
Technology Source: Marzocchi Pompe (Italy)
Pump Type: External Gear Pump
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Housing Material: High-strength aluminum alloy
Bearing Material: Special low-friction, high-resistance die-cast aluminum alloy bushings
Mounting Type: Flange (F) or Foot (L)
Shaft Type: Parallel keyed shaft (I)
Port Thread: Inlet PT1/2″ , Outlet PT1/2″
Port Diameter: Inlet Ø17.5, Outlet Ø14.8
Direction of Rotation: Clockwise (R) standard; Counter-clockwise (L) optional
Recommended Fluid: Mineral hydraulic oil
Operating Temperature Range: -20°C to +80°C
Model-Specific Specifications
K1P1R11A
K1P6R11A
K1P7R11A
K1P10R11A
Displacement: 10.5 cc/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Minimum Speed: 500 rpm
Maximum Speed: 2500 rpm
Weight: 1.75 kg
Key Technical Advantages
1. High-Strength Aluminum Housing for Lightweight Design
The K1P Series pump body is manufactured from high-strength aluminum alloy with high-precision design, delivering substantial weight reduction while maintaining structural integrity (K1P1R11A weighs only 1.58 kg, K1P10R11A only 1.75 kg). The lightweight design simplifies installation and reduces the load on host machinery – particularly critical for weight-sensitive mobile equipment applications.
2. Excellent Durability and High-Wear-Resistant Bearings
The K1P Series gear pumps have passed one million impact fatigue tests at 24.5 MPa high-pressure conditions. The high-performance high-wear-resistant bearings operate reliably without burnout under high-pressure, high-speed conditions. This design ensures high reliability and extended service life during long-term continuous operation.
3. High Volumetric Efficiency and High Mechanical Efficiency
Through precise and detailed design, the K1P Series gear pumps maintain high volumetric efficiency and high mechanical efficiency. Optimized gear meshing and precision machining effectively minimize internal leakage and mechanical friction losses, ensuring stable and efficient hydraulic power output under all operating conditions.
4. Low Noise Operation
The aluminum body with high-precision design delivers low noise operation. The low-noise characteristic significantly improves operator working conditions, making it particularly suitable for indoor equipment and precision machinery applications with strict noise requirements.
5. Flexible Configuration Options
The K1P Series supports multiple configuration options:
Rotation Direction: Clockwise (R) or Counter-clockwise (L)
Mounting Type: Flange (F) or Foot (L)
Relief Valve: Optional integral relief valve (V suffix)
Pump Configuration: Single or tandem pumps
Displacement Options: 1 / 2 / 3 / 4 / 6 / 7 / 9 / 10 / 12 cc/rev and more
Application Areas
Construction Equipment: Excavators, wheel loaders, bulldozer hydraulic systems
Material Handling Equipment: Forklifts, stackers, handling machinery hydraulic systems
Agricultural Machinery: Agricultural, forestry, and fishery machinery hydraulic systems
Industrial Hydraulic Systems: Presses, injection molding machines, machine tool hydraulic power units
Hydraulic Power Units (HPU): Power elements for compact hydraulic power stations
Industrial Vehicles: Hydraulic drive systems for various industrial vehicles
Building Machinery: Concrete mixer trucks, pump truck hydraulic systems
Expert Maintenance Tips
1. Model Confirmation and Selection
Complete K1P series model should include: Series (K1P) + Size Code (1/6/7/10) + Rotation (R/L) + Design Number (11A) + Optional Suffix (V with valve / F flange) .
Verify system operating pressure (≤ 245 bar), displacement requirements, and rotation direction during selection.
K1P1 max speed: 6000 rpm; K1P6: 4000 rpm; K1P7: 3500 rpm; K1P10: 2500 rpm. Verify original drive speed during selection.
2. Pre-Installation Checks
K1P Series pumps have a fixed rotation direction (R = clockwise, L = counter-clockwise) – verify matches system drive direction before installation.
Confirm mounting type (Flange F or Foot L) for compatibility with system interface.
Confirm shaft type is parallel keyed (I) for precise coupling fit.
Confirm port thread specifications (Inlet PT1/2″, Outlet PT1/2″) precisely match hydraulic fittings.
Never use hammer-driven installation – always use proper tools.
3. First Start-Up & Oil Priming
Prime the pump housing with clean hydraulic oil before first start-up; ensure suction line is fully filled – never run dry.
Recommended fluid: ISO VG 32–46 anti-wear hydraulic oil.
Maintain operating temperature within -20°C to +80°C.
Minimum speed requirements: K1P1 ≥ 1300 rpm, K1P6 ≥ 700 rpm, K1P7 ≥ 600 rpm, K1P10 ≥ 500 rpm.
4. Filtration & Fluid Cleanliness
5. Operating Monitoring
Continuous operating pressure must not exceed 20.6 MPa; peak pressure must not exceed 24.5 MPa.
If abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.
Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.
For models with integral relief valves (V suffix), do not operate continuously in relief mode.
