TOP-2MY400-204HBEMVB NOP Trochoid Pump 4cc 400W 3MPa

Product Overview

The TOP-2MY400-204HBEMVB is a standard configuration model within the NOP (Nippon Oil Pump) 2MY Series of three-phase motor-integrated trochoid pumps. The 2MY Series employs an internal gear (trochoid rotor) operating principle, in which volume chambers formed between the outer and inner gear rings expand and contract during rotation to draw in and discharge fluid. As a positive displacement pump with self-priming capability, it requires no priming oil to start. The series integrates a three-phase squirrel-cage induction motor with the trochoid pump in a single compact unit — the smallest envelope among comparable-capacity pump types.

The specific model covered in this document — TOP-2MY400-204HBEMVB — belongs to the 2MY-2HBM oil pump series, featuring 4 cm³/rev displacement, 400W motor power, and 3.0 MPa maximum discharge pressure, designed for conveying operating oil, lubricating oil, and cooling oil. Model code breakdown: TOP-2MY400 designates the 2MY Series with 400W motor; 204 indicates the pump model (4 cm³/rev displacement); HBM denotes oil pump type (for operating/lubricating oil); E specifies the filter configuration; and VB indicates the relief valve configuration. The pump is manufactured to original NOP specifications with 100% drop-in interchangeability — motor-to-pump connection dimensions and performance parameters match NOP original products exactly, requiring no modification to mounting interfaces or piping connections. Every unit undergoes 100% simulated operating condition testing at the factory, including rated pressure loading, flow verification, motor insulation testing, and seal integrity assessment prior to shipment.

Technical Specifications 

TOP-2MY400-204HBEMVB:

• Series / Type: NOP 2MY Series three-phase motor-integrated trochoid pump

• Pump model: 204HBM (4 cm³/rev displacement)

• Operating principle: Internal gear (trochoid rotor), positive displacement, self-priming

• Theoretical displacement: 4 cm³/rev

• Discharge at 50Hz (1,500 rpm): 6.0 L/min

• Discharge at 60Hz (1,800 rpm): 7.2 L/min

• Motor output: 400W

• Motor type: Three-phase squirrel-cage induction motor, totally enclosed fan-cooled, Class E insulation, IP44 protection

• Poles: 4

• Voltage: Three-phase 200V / 380V (model dependent)

• Frequency: 50/60 Hz

• Speed: 1,500 min⁻¹ at 50Hz / 1,800 min⁻¹ at 60Hz

• Rated current: 1.08A (380V/50Hz), 1.03A (380V/60Hz)

• Maximum discharge pressure: 3.0 MPa (400W motor configuration)

• Suitable fluids: Operating oil, lubricating oil, cooling oil

• Suitable fluid viscosity: 10–500 mm²/sec

• Fluid temperature range: -5 to 80°C

• Direction of rotation: Clockwise (standard), counterclockwise available (R configuration)

• Relief valve: VB configuration, built-in relief valve

• Filter: E configuration, with suction filter

• Mounting: Motor-integrated flange mount

• Approximate weight: 9 kg (motor section)

2MY-2HBM Oil Pump Series Displacement Range (for reference):

• TOP-2MY400-203HBMVB: 2.8 cm³/rev, 50Hz discharge 4.2 L/min, 60Hz discharge 5.0 L/min, max pressure 3.0 MPa

• TOP-2MY400-204HBMVB: 4 cm³/rev, 50Hz discharge 6.0 L/min, 60Hz discharge 7.2 L/min, max pressure 3.0 MPa

• TOP-2MY400-206HBMVB: 6 cm³/rev, 50Hz discharge 9.0 L/min, 60Hz discharge 10.8 L/min, max pressure 2.5 MPa

• TOP-2MY400-208HBMVB: 8 cm³/rev, 50Hz discharge 12.0 L/min, 60Hz discharge 14.4 L/min, max pressure 2.5 MPa

• TOP-2MY400-210HBMVB: 10 cm³/rev, 50Hz discharge 15.0 L/min, 60Hz discharge 18.0 L/min, max pressure 2.5 MPa

• TOP-2MY400-212HBMVB: 12 cm³/rev, 50Hz discharge 18.0 L/min, 60Hz discharge 21.6 L/min, max pressure 2.0 MPa

• TOP-2MY400-216HBMVB: 16 cm³/rev, 50Hz discharge 24.0 L/min, 60Hz discharge 28.8 L/min, max pressure 1.5 MPa

• TOP-2MY400-220HBMVB: 20 cm³/rev, 50Hz discharge 30.0 L/min, 60Hz discharge 36.0 L/min, max pressure 1.2 MPa

2MY-2HWM Cutting Fluid Pump Series Displacement Range (for reference):

• TOP-2MY400-204HWMVB: 4 cm³/rev, 50Hz discharge 6.0 L/min, 60Hz discharge 7.2 L/min, max pressure 2.0 MPa

• TOP-2MY400-206HWMVB: 6 cm³/rev, 50Hz discharge 9.0 L/min, 60Hz discharge 10.8 L/min, max pressure 2.0 MPa

• TOP-2MY400-208HWMVB: 8 cm³/rev, 50Hz discharge 12.0 L/min, 60Hz discharge 14.4 L/min, max pressure 2.0 MPa

• TOP-2MY400-210HWMVB: 10 cm³/rev, 50Hz discharge 15.0 L/min, 60Hz discharge 18.0 L/min, max pressure 2.0 MPa

• TOP-2MY400-212HWMVB: 12 cm³/rev, 50Hz discharge 18.0 L/min, 60Hz discharge 21.6 L/min, max pressure 2.0 MPa

Note: Technical data above is sourced from NOP official product catalogues and authorized distributor technical data. The 2MY Series is NOP’s trochoid pump line, covering 2HBM (oil pump) and 2HWM (cutting fluid pump) sub-series, with motor power from 200W to 1,500W and displacements from 2.8 to 30 cm³/rev. For precise configuration parameters of the TOP-2MY400-204HBEMVB, always confirm against the official NOP technical manual or the product nameplate data.

Key Technical Advantages

1. Internal Gear Trochoid Rotor Design with Compact Construction

The 2MY Series employs an internal gear (trochoid rotor) operating principle, with volume chambers formed between the outer and inner gear rings. During rotation, these chambers periodically expand and contract to draw in and discharge fluid. The engineering advantage of this design lies in its self-priming capability as a positive displacement pump — no priming oil is required for startup, simplifying system commissioning. The internal gear configuration minimizes the pump envelope among comparable-capacity pump types, and the motor-pump integrated design further compresses the installation footprint, particularly suited to machine tools and hydraulic power units with constrained mounting space.

2. Motor-Pump Integration for System Simplification

The 2MY Series integrates a three-phase squirrel-cage induction motor with the trochoid pump in a single unit, eliminating the coupling and separate motor mounting base. The engineering value is threefold: reduced component count and lower risk of installation misalignment; increased drivetrain rigidity with reduced vibration and noise; and single-component procurement that simplifies spare parts management and assembly for equipment manufacturers. The motor features a totally enclosed fan-cooled construction with Class E insulation and IP44 protection, suitable for dusty and oily environments.

3. Relief Valve Configuration for System Protection

The VB configuration of the TOP-2MY400-204HBEMVB includes a built-in relief valve that automatically unloads when system pressure exceeds the set value, protecting the pump body and downstream components from overpressure damage. For lubrication and cooling circulation systems, the relief valve ensures the pump is not damaged even if downstream piping becomes blocked. Relief valve setting pressure is adjustable to suit system requirements, providing flexibility for system integration.

4. Suction Filter Configuration for Fluid Cleanliness

The E configuration of this model includes a suction filter that provides initial filtration of fluid at the pump inlet, effectively intercepting particulate contaminants and protecting internal running surfaces from wear. For precision machine tool lubrication systems or long-running hydraulic power units, the suction filter configuration significantly extends pump service life and reduces contamination-related downtime. The filter can be periodically cleaned or replaced with minimal maintenance effort.

5. NOP Original Quality with Global Interchangeability

NOP (Nippon Oil Pump), founded in 1929, is one of Japan’s oldest specialist oil pump manufacturers, with trochoid pump products enjoying an exceptional reputation in machine tool, hydraulic, and industrial equipment applications worldwide. The 2MY Series is manufactured to original NOP drawings and material standards, with motor-to-pump connection dimensions, performance parameters, and mounting interfaces matching NOP original products exactly, providing 100% drop-in interchangeability. Users can replace pumps without modifying existing system piping or electrical wiring, significantly reducing the technical threshold for equipment maintenance and upgrades.

Application Areas

• Machine tool lubrication systems: CNC machine tools, machining centres, grinding machines — centralised lubrication supply

• Cutting fluid circulation: 2HWM Series dedicated models for water-soluble/oil-based cutting fluid delivery and circulation

• Hydraulic power unit supply: Small hydraulic power unit circulation and replenishment

• Industrial cooling systems: Cooling oil circulation

• Cold heading / forging equipment: Cold heading machine oil pumps, forging equipment lubrication supply

• Printing machinery: Printing ink and fountain solution delivery

• Textile machinery: Textile equipment lubrication and cooling oil circulation

• Reducer lubrication: Forced lubrication supply for gear reducers

Expert Maintenance Tips

1. Pre-Start Checks and Preparation

Before first startup after installation or repair, verify correct motor wiring (three-phase 200V or 380V per nameplate) and confirm rotation direction matches the pump body arrow marking. The trochoid pump is self-priming, but injecting a small amount of clean hydraulic oil into the pump body before initial startup is recommended to shorten suction time and reduce starting wear. Confirm that the suction filter (E configuration) is properly installed and not blocked.

2. Fluid Viscosity and Temperature Control

The 2MY-2HBM oil pump is suitable for fluid viscosities of 10–500 mm²/sec and fluid temperatures of -5 to 80°C. Excessive viscosity causes suction difficulty, cavitation, and noise; insufficient viscosity reduces volumetric efficiency and increases internal leakage. Select fluid viscosity appropriate to ambient temperature and monitor oil temperature during operation to ensure it does not exceed 80°C. For cutting fluid pumps (2HWM Series), suitable viscosity is 2–100 mm²/sec, with sealing components using fluorinated materials compatible with water-soluble cutting fluids.

3. Relief Valve Setting Pressure Inspection and Adjustment

The relief valve in the VB configuration is factory-set to standard values. After installation, confirm whether the relief valve setting pressure is appropriate for actual system requirements. Excessive setting pressure defeats the protective function; insufficient pressure may cause system pressure deficiency and weak actuator response. Adjust the relief valve gradually, observing system pressure changes after each adjustment to avoid abrupt large adjustments.

4. Periodic Suction Filter Maintenance

The suction filter in the E configuration should be inspected periodically, with cleaning or replacement intervals determined by fluid contamination levels. A blocked filter increases suction resistance, causing cavitation and noise, and can damage the pump body in severe cases. In dusty industrial environments, consider shortening filter maintenance intervals or increasing filtration precision to extend pump life.

5. Motor Insulation and Temperature Monitoring

Periodically check motor insulation resistance to ensure it remains above specified values. Monitor motor casing temperature during operation — abnormal temperature rise may indicate motor overload, bearing wear, or internal pump binding, requiring immediate shutdown and inspection. The motor features a totally enclosed fan-cooled construction; the cooling fan and air passages should be kept clean to avoid dust accumulation affecting heat dissipation.

6. Restart Procedure After Extended Shutdown

If the pump has been idle for more than three months, manually rotate the motor fan to confirm the rotor turns freely, and inspect the pump body for leakage before restarting. Extended shutdown can cause fluid drainage from the pump, reducing self-priming capability. Before restarting, inject clean oil into the pump body and start with brief jogging to confirm normal suction before continuous operation.