Marzocchi ALP1A ALP2A Series Hydraulic Gear Pump | ALP2-D-22 ALP1-D-11 | High Efficiency Aluminum Pump

Chengyuan Hydraulic presents the ALP1A and ALP2A Series high-performance aluminum gear pumps, engineered as premium replacements for Marzocchi (Italy) industry standards. This series spans a wide displacement range, from compact Group 1 units to robust Group 2 models, including core specifications such as ALP1-D-11, ALP2-D-22, and ALP2A-D-25-FG with reinforced front bearings.

Chengyuan ensures 100% Drop-in Interchangeability for all ALP series pumps concerning mounting dimensions (SAE and Euro standards), shaft ends, and port configurations. Utilizing high-strength specialty aluminum alloy bodies and precision-ground gear sets, combined with our 100% Simulation Load Testing, we guarantee that every pump delivers exceptional volumetric efficiency and low noise levels under continuous high pressure.

Technical Specifications 

• Series Category: ALP1A (Group 1) / ALP2A (Group 2)

• Displacement Range (ALP1): 1.4 $cm^3$/rev to 13.8 $cm^3$/rev (e.g., ALP1-D-11)

• Displacement Range (ALP2): 4.5 $cm^3$/rev to 35.2 $cm^3$/rev (e.g., ALP2-D-22/25/30)

• Rated Pressure: 210 bar (21 MPa)

• Peak Pressure: Up to 250 bar (25 MPa)

• Max Speed: 3000 – 6000 rpm (depending on displacement)

• Control Method: Fixed displacement

• Shaft Options: D (Parallel Key), FG (Front Bearing), C1 (Tapered Shaft)

• Materials: High-strength extruded aluminum body with cast iron covers

• Seals: NBR (Standard) or Viton (High-Temperature)

Key Technical Advantages:

• High-Strength Aluminum Monoblock: The body is extruded from a special aluminum alloy that offers high tensile strength and minimal weight, preventing housing distortion under 250 bar peak pressures.

• Enhanced Bearing System (FG Option): Models with the “FG” suffix feature an outboard bearing designed to handle high radial and axial loads, making them ideal for pulley or gear drive applications.

• DU Bushings & Pressure Compensation: High-performance DU bushings reduce friction. Floating compensation plates automatically adjust end-clearance based on system pressure, maintaining volumetric efficiency above 95%.

• Low Pulsation Gear Design: Gears are precision-ground with optimized profiles to minimize flow pulsation and mechanical noise, ensuring smoother system operation.

Application Areas:

• Construction Machinery: Power systems for skid steers, mini-excavators, and forklifts.

• Agricultural Equipment: Tractor hitch systems and auxiliary hydraulic circuits for harvesters.

• Industrial Automation: Hydraulic Power Units (HPU), shearing machines, and material lifting platforms.

Expert Maintenance Tips:

• Rotation Check: Always verify the rotation direction before installation (D for Clockwise, S for Counter-clockwise). Reversing rotation will cause immediate seal failure.

• Fluid Cleanliness: For maximum service life, use anti-wear hydraulic oil (ISO VG 32-46) and maintain cleanliness at NAS Class 9 or better.

• System Priming: During initial startup, “jog” the motor to ensure the pump is primed with oil and air is purged from the suction line to prevent cavitation damage.