Hydraulic Gear Pump HMA2 HPA3 HPA4 HPA6 HPLPA211 HPLPA HPGPB HPGPA336D21G7G6B00 HPLPA211DMNG4G4B00

1. Technical parameters
Basic specifications
Type: Quantitative external gear pump, suitable for medium and high-pressure hydraulic systems.
Nominal displacement: 14 cm³/rev (the “D14” in the model directly corresponds to the displacement).
Pressure range: Rated pressure 250 bar, peak pressure 280 bar (refer to models of the same series and industry standards).
Speed range: 650-3500 rpm (wide speed adaptability, compatible with various power sources).
Volumetric efficiency: ≥98% (high-precision gear clearance and axial compensation design).
Noise level: ≤75 dB (A) (at 1500 rpm), with low noise characteristics suitable for precision equipment.
Oil compatibility
Applicable medium: Mineral hydraulic oil, synthetic hydraulic oil (ISO VG 32/46/68).
Working oil temperature: -20℃ to + 80℃ (recommended range: 40-60℃).
Viscosity range: 10-380 mm²/s, with the optimal viscosity being 30-50 mm²/s.
Interface and Installation
Oil port connection: SAE flange or threaded interface (such as M20×1.5), compatible with standard hydraulic pipelines.
Installation method: Flange type or foot bracket type. It is necessary to ensure that the coaxiality of the motor and the pump shaft is ≤ 0.05mm.2. Working Principle
External meshing gear transmission mechanism
Oil suction process: When the driving gear disengages from the driven gear, the volume of the sealed cavity increases, creating a vacuum to suck in the oil.
Oil discharge process: When the gears engage, the volume of the sealed cavity decreases, and the oil is squeezed and discharged through the oil outlet.
Continuous output: The gears rotate continuously to achieve stable high-pressure oil transportation.
Axial clearance compensation technology
The gap between the gear and the side plate is automatically adjusted through the floating side plate or the spring-loaded compensation plate to reduce internal leakage and improve volumetric efficiency.
The compensation mechanism can maintain stable performance under high pressure and extend the service life.

3. Product features and advantages
Core features
High reliability: It adopts high-strength aluminum alloy housing and wear-resistant gear materials (such as carburized and quenched steel), with strong impact resistance.
Low pulsation output: Smooth gear meshing, flow pulsation ≤±3%, reducing system vibration and noise.
Anti-pollution capacity: It allows the oil cleanliness to reach ISO 18/16/13 (particle count: >4μm ≤250,000 cells /mL), which is superior to that of plunger pumps.
Differentiation advantage
Wide speed range: 650-3500 rpm, compatible with various power sources such as motors and internal combustion engines.
Compact design: Small in size and light in weight, suitable for equipment with limited space.

4. Usage functions and purposes
Core function
Flow supply: Continuously and stably output high-pressure oil to drive hydraulic actuating elements (hydraulic cylinders, hydraulic motors).
Pressure regulation: It can be combined with a relief valve to achieve system pressure protection and prevent overload.
Typical application scenarios
Injection molding machine: It provides high-pressure oil required for the injection molding and holding pressure stages to ensure the precision of the products (such as in the production of HP printer housings).
Construction machinery: Hydraulic systems of excavators and loaders, achieving multi-action compound control.
Agricultural machinery: Drive for the header lifting and threshing device of combine harvesters.
Marine machinery: Hydraulic drive for deck machinery (such as anchor winches and winches), suitable for harsh Marine environments.

5. Applicable machines and scenarios
Industrial equipment
Hydraulic press: For high-pressure processes such as metal forming and rubber vulcanization, the maximum pressure can reach 280 bar.
Machine tool: The feed system of the combined machine tool requires a flow accuracy within ±1%.
New energy equipment: Hydraulic tension control of lithium battery electrode sheet coating machines to ensure uniform coating.
Mobile machinery
Port machinery: The hoisting and luffing mechanisms of container cranes need to withstand frequent starts and stops as well as impacts.
Construction machinery: The pumping system of concrete pump trucks requires high reliability and continuous operation.

6. Similar models
HPG2A0D12C1U0
HPG2A0D16C1U0
HPG2A0D14C2U0
HPG2A0D14C1U1

7. Precautions for Use
Installation and connection
Coaxiality requirement: The coaxiality between the motor and the pump shaft should be ≤ 0.05mm; otherwise, it will cause vibration and bearing damage.
Suction pipeline: Pipe diameter ≥1.5 “, length ≤ 1.5m, to avoid excessive suction resistance causing cavitation.
Oil drain port: Connect it back to the fuel tank separately and maintain a back pressure of 0.5-1.0 bar to prevent air from entering.

Oil and fluid management
Cleanliness control: Use 10μm filter elements (such as Parker FH06 series), and regularly test the cleanliness of the oil to ensure compliance with ISO 18/16/13.
Viscosity matching: Preheat to above 20℃ when starting at low temperatures. Use high-viscosity oil (ISO VG 68) in high-temperature environments.

Operation monitoring
Pressure monitoring: Install a pressure gauge to monitor the system pressure in real time and avoid overpressure operation (exceeding 280 bar).
Temperature management: Shut down the machine for inspection when the oil temperature exceeds 80℃ to troubleshoot faults in the cooling system.

Maintenance and fault handling
Regular maintenance: Replace the filter element every 500 hours and check the gear wear every 2000 hours (replacement is required if the tooth thickness wear is greater than 0.1mm).

Common faults
Abnormal noise: Check whether the oil suction pipeline is leaking and whether the oil is emulsified.
Insufficient flow: Clean the gap between the gear and the side plate, or replace the worn floating compensation plate.