Marzocchi hydraulic pump ALP3A-D-40-FG detailed parameters

1. Model Nomenclature Explanation

• ALP: Product series, indicating the standard pressure external gear pump, which is suitable for medium and low pressure industrial hydraulic systems and adopts an aluminum alloy pump body.
• 3A: Size group, representing the specific size classification of the pump (belonging to the ALP3 group), which determines the basic installation dimensions and maximum displacement of the pump, with a displacement range of 20~87 cm³/rev.
• D: Mounting method, standing for flange mounting (different from shaft extension mounting marked with “S”), which is widely used in scenarios requiring stable and firm installation.
• 40: Displacement code, corresponding to the theoretical displacement of the pump (specific value refers to the technical specifications below), which is within the displacement range of the ALP3 group.
• FG: Special options, where “F” means equipped with a pressure limiting valve, and “G” means adopting mechanical seal for better sealing performance, which is a common special configuration for Marzocchi ALP series pumps.

2. Basic Information

3. Key Technical Specifications

4. Material & Sealing

• Pump Body & Covers: High-strength aluminum alloy, which ensures light weight and good corrosion resistance, suitable for medium and low pressure working conditions, consistent with the material standard of Marzocchi ALP series pumps. The flange is integrated with the pump body for enhanced structural stability.
• Gears: Special hardened steel, precision machined to minimize internal clearance, reduce internal leakage and improve transmission efficiency, which is the standard gear material for ALP series high-performance models.
• Sealing: Mechanical seal (marked with “G” in the model), with NBR sealing material as auxiliary, ensuring good sealing performance and preventing oil leakage; the sealing configuration is consistent with the standard “FG” option of Marzocchi gear pumps, adapting to flange mounting’s sealing requirements.

5. Shaft & Mounting Details

• Shaft Type: Conical shaft with a taper of 1:8, equipped with a 6 mm key for stable power transmission, consistent with ALP3 group shaft type standard to ensure torque transmission stability.
• Shaft Dimensions: Shaft diameter is 22 mm, shaft length (including fitting edge) is 45 mm, fitting edge diameter is 50 mm; shaft thread size is M16×1.5, slightly shorter shaft length than ALP3A-S-50-FG to match flange mounting structure.
• Mounting Type: Flange mounting (code “D”); flange type is European standard 4-hole mounting, centering diameter is 50 mm, which is consistent with the mounting standard of ALP3 group flange-mounted pumps, ensuring firm installation and reducing vibration during operation.
• Shaft Load & Torque: Maximum torque is 380 Nm, recommended shaft tightening torque is 80±5 Nm (slightly lower than ALP3A-S-50-FG due to smaller displacement, matching the model’s working parameters).

6. Port Specifications

• Inlet Port: 1″ BSP (GAS) thread, used for connecting the oil suction pipeline; matched with the 40 displacement to meet the flow demand, consistent with ALP3 group port size standard.
• Outlet Port: 3/4″ BSP (GAS) thread, used for connecting the oil discharge pipeline to supply hydraulic oil to the system; matched with the inlet port to ensure stable oil flow and pressure, adapting to medium-flow working scenarios.

7. Operating Conditions

• Hydraulic Oil Viscosity: Allowed range is 6-500 cst, recommended range is 15-100 cst for optimal performance; the recommended range is adapted to the model’s displacement and pressure characteristics, ensuring smooth operation.
• Operating Temperature: -10°C to +80°C (pump start-up and continuous operation temperature range), consistent with ALP series overall operating temperature standard, suitable for most industrial working environments.
• Rotation Direction: Counterclockwise (CCW) under standard configuration; clockwise (CW) can be customized according to user needs, which is the standard rotation direction option for Marzocchi gear pumps.

8. Product Features

• High Efficiency & Stability: Precision-machined gears with minimal clearance reduce internal leakage, ensuring high output efficiency and stable pressure supply; optimized for the ALP3 group’s pressure and 40 displacement characteristics, suitable for medium-flow scenarios.
• Strong Self-priming Capacity: It can quickly suck hydraulic oil even under low-pressure conditions, adapting to various working environments; the self-priming performance is optimized to match the 40 displacement, and the allowable suction vacuum is 110mm column.
• Low Noise: Optimized gear meshing design and compact structure effectively reduce operating noise, suitable for noise-sensitive occasions; consistent with the low-noise design concept of ALP series, flange mounting further reduces vibration and noise.
• High Reliability: Equipped with a pressure limiting valve (marked with “F” in the model) for overload protection, which can automatically adjust or cut off the oil circuit in abnormal conditions to protect the pump and hydraulic system; the pressure limiting valve is matched with the ALP3 group’s pressure parameters.
• Easy Installation & Maintenance: Compact structure, standardized flange mounting dimensions facilitate installation and daily maintenance; the installation requirements are consistent with ALP series, requiring the pump and motor shaft to be aligned with coaxiality controlled within 0.1mm, ensuring stable operation.

9. Application Fields

10. Notes

• The parameters listed above are based on standard configuration; for customized products, parameters may vary slightly, please refer to the official product manual. The ALP3 series can be customized with different sealing materials or rotation directions according to application needs.
• It is recommended to use hydraulic oil that meets the viscosity requirements to ensure the long-term stable operation of the pump; the oil suction pipeline should be strictly sealed to prevent air leakage, and the pipeline diameter should not be smaller than the pump inlet diameter.
• During installation, please ensure that the mounting torque and shaft connection are correct to avoid equipment failure caused by improper installation; the pump should be installed close to the oil tank, and the suction height should not exceed 500mm to prevent cavitation; flange mounting should ensure tight fitting to reduce vibration.