NOP Trochoid Pump N3H Series Replacement TOP-N320H

Genlu Hydraulic excels as an elite-tier global developer and precision manufacturer of industrial-grade high-efficiency gear pumps, trochoid pumps, variable piston pumps, and fluid manifolds for premium B2B industrial engineering networks. The N3H Series High-Performance Internal Gerotor Trochoid Pump Line—engineered to deliver a premium 100% drop-in interchangeable alternative to Japan’s premier processing standard, specifically referencing the NOP / Nippon Oil Pump legacy industrial series TOP-N320H, TOP-N330H, TOP-N340H, and TOP-N350H—represents a sophisticated positive-displacement fluid-power solution for modern manufacturing configurations. Utilizing a precision inner/outer trochoid rotor gear profile arrangement, this series is engineered for machine tool high-pressure coolant injection (Through-Spindle Coolant Systems), precise cutting-fluid delivery, forced heavy-duty gearbox lubrication, and stable low-pressure hydraulic actuation circuits, commanding the industry in pressure tracking, silent operation, and long wear life.

In continuous industrial applications, such as high-pressure center-flushing systems on machine tools or continuous industrial oil filtering loops, main supply pumps must maintain structural integrity under a continuous 3.0 MPa load while constantly dealing with micro-fine metal chips or abrasive wheel dust inside the fluid media. Substandard aftermarket alternative trochoid pumps lacking adequate rotor hardness or proper axial face clearance float control face accelerated wear, resulting in a sudden drop in volumetric performance, severe heat buildup, and extreme howling, often seizing the rotating kit and halting production lines. Genlu’s premium N3H series replacement pumps are reverse-engineered to perfectly match the precise inner/outer gerotor geometry, micro-clearance sealing matrices, and anti-cavitation iron housings detailed in official NOP engineering documentation. Whether validating horizontal/vertical mounting bolt configurations, straight keyed drive shaft ends, or internal pipe thread porting specifications, our pumps ensure 100% mechanical and functional drop-in interchangeability. Prior to shipment, each unit undergoes 100% Full-Simulation Condition Testing under full continuous pressure limits to evaluate volumetric tracking, suction lift vacuum, and decibel limits, ensuring absolute drop-in reliability immediately upon deployment.

Technical Specifications 

• Product Pump Classification: N3H Series High-Performance Internal Gerotor Trochoid Hydraulic Gear Pump

• Core Cross-Reference Model Configurations: TOP-N320H / TOP-N330H / TOP-N340H / TOP-N350H

• Nominal Geometric Displacement Volume:

  • TOP-N320H: 20 $cc/rev$

  • TOP-N330H: 30 $cc/rev$

  • TOP-N340H: 40 $cc/rev$

  • TOP-N350H: 50 $cc/rev$

• Maximum Continuous Rated Operating Pressure: 3.0 MPa (30 bar / 435 PSI)

• Permissible Operational Shaft Input Speed Range: 500 RPM — 1800 RPM

• Standard Delivery Flow Performance (At 1500 / 1800 RPM):

  • TOP-N320H: 30.0 / 36.0 $L/min$

  • TOP-N330H: 45.0 / 54.0 $L/min$

  • TOP-N340H: 60.0 / 72.0 $L/min$

  • TOP-N350H: 75.0 / 90.0 $L/min$

• Overload Protection Configuration Option: Integrated adjustable safety relief valve optional for pressure spikes bypass

• Drive Shaft Output Mechanical Profile: Cylindrical straight shaft paired with a standard industrial flat key arrangement

• Main Fluid Porting Connections Geometry: Precision internal thread ports conforming to standard RC or G standard alignments

• Total Pump Assembly Net Dry Weight: Range spanning 8.5 kg — 12.0 kg (Heavy-duty anti-leakage cast iron design)

Key Technical Advantages:

• Micro-Matched Trochoid Gear Profiles for Low Hydraulic Pulsation: The inner and outer gerotors are ground via multi-axis CNC profile grinding machines, holding profile deviations under $\pm 1.5 \mu m$. Because the trochoid profile features continuous, simultaneous multi-tooth sealing zones with smooth volume changes, fluid transition is uniform. This setup eliminates pressure ripples, maintaining running noise under 55–58 dB(A) at a full 3.0 MPa load.

• Axial Hydrostatic Floating Side Clearance Self-Compensation: Features a pressure-loaded axial side wear plate system that uses internal pilot pressure to achieve micrometer-level face clamping. Even if fluid temperatures exceed 60°C during sustained operation—causing fluid viscosity to drop—this compensation setup stops cross-chamber internal leakage to keep volumetric efficiency over 92% across the entire N320H–N350H range.

• Vacuum-Hardened Special Alloy Steel Rotating Assembly: Both inner and outer rotors are machined from a high-wear tool steel alloy, hardened via vacuum heat treatment to exceed HRC58 and finished via micro-lapping. This hard surface prevents scratching from micro-fine metal shavings or grinding dust carried in machine-shop cutting fluids, extending wear life to 3 times that of standard cast iron alternatives.

• Dual-Lip Mechanical Shaft Seal with Low-Pressure Bleed Passages: Outfitted with a heavy-duty Silicon Carbide/Viton mechanical face seal (or dual-lip high-pressure oil seal) and backed by a built-in pressure relief channel. This internal passage automatically routes fluid accumulation away from the seal chamber and back to the intake port, preventing shaft seal weeping or blowout failures even if transient circuit backpressures spike.

Application Areas:

• High-Precision CNC Machining Centers and Multi-Axis Turning Centers: Delivering high-pressure delivery for Through-Spindle Coolant (TSC) systems and high-volume bed flushing.

• Heavy Industrial Machinery and Large Gearbox Drive Packages: Supplying continuous-loop lubrication oil circulation and hydrostatic oil bearing lift networks.

• Custom Automated Hydraulic Power Units and Filtering Packages: Ideal for low-pressure high-flow auxiliary control loops and plant-wide offline fluid conditioning systems.

Expert Maintenance Tips:

• Mandatory High-Density Suction Strainer Rules for Machining Coolant Loops: When deploying N3H series pumps to transfer machine tool cutting fluid or recycled water, you must fit a high-strength stainless steel suction filter of 80-mesh or finer in the intake line. Although the Genlu rotor core has high wear resistance, massive ingestion of rigid metal shavings larger than 0.1 mm will jam the rotating components, risking shaft fracture.

• Absolute Restriction Against Dry Running and Initial Priming Guidelines: Gerotor-type configurations require instant lubrication at initial shaft rotation to prevent internal scoring. Always prime the pump body with clean fluid through the ports before initial startup. During commissioning, jog the motor to verify rotation matches the housing arrow, and run the pump unladen at zero pressure for 2 minutes to vent air before ramping up pressure.

• Operational Limitations Regarding the Integrated Safety Relief Valve: For models equipped with an internal safety relief valve, this component is built as a secondary safety shield against pressure spikes—it must never be used as a primary system pressure regulator for long-term bypass dumping. Continuous full-flow dumping through the internal valve will raise pump temperature past 80°C within 10 minutes, inducing thermal binding of the rotors.

TOP-2RA-12C