Product Overview
The ALM series (ALM1 / ALM2 / ALM3) and ALP series (ALP1A / ALP2A / ALP3A) are aluminum external gear hydraulic products from the Italian manufacturer Marzocchi Pompe. ALM denotes hydraulic motors, while ALP denotes gear pumps.
The ALM series are bidirectional gear motors that convert hydraulic energy into rotational mechanical torque. ALM1 displacements range from 2.8 to 4.1 cm³/rev; ALM2 from 4.5 to 28.2 cm³/rev; ALM3 from 20 to 87 cm³/rev. ALP1 displacements range 1.4 – 13.8 cm³/rev; ALP2 4.5 – 35.2 cm³/rev; ALP3 20 – 87 cm³/rev.
Engineered with high-strength aluminum alloy housings and aluminum bushing-supported gears. Every unit ensures 100% drop-in interchangeability and undergoes rigorous simulated duty-cycle testing.
Brand Disclaimer: This product is a high-quality compatible replacement engineered for full interchangeability with Marzocchi original equipment. All Marzocchi brand names and model codes are referenced solely to indicate compatibility. This product is manufactured by an independent producer.
Technical Specifications
ALM1-R-4-E1 (Gear Motor)
Model Code: ALM1-R-4-E1
Brand Series: Marzocchi ALM1 (Group 1)
Product Type: Bidirectional Gear Motor
Displacement: 2.8 cm³/rev
Flow @ 1500 rpm: 3.9 L/min
Continuous Pressure (P1) : 250 bar
Intermittent Pressure (P2) : 240 bar
Peak Pressure (P3) : 270 bar
Maximum Speed: 5,000 rpm
Rotation: Bidirectional (Reversible / R)
Mounting Flange: European standard flange
Shaft: 1:8 tapered shaft
Ports: Flanged E-type ports
Housing Material: High-strength aluminum alloy
Operating Temperature: -20°C to +80°C
ALM2 Series (Gear Motors – User Specified Models)
Brand Series: Marzocchi ALM2 (Group 2)
Product Type: Bidirectional Gear Motor
Housing Material: High-strength aluminum alloy
Continuous Pressure (P1) : 250 bar (smaller displacements) / 230 – 170 bar (larger displacements)
Model-Specific Data:
ALM2-R-9-E1: 6.4 cm³/rev, 9.1 L/min@1500rpm, 250 bar, 4000 rpm max
ALM2-R-10-E1: 7.0 cm³/rev, 10.0 L/min@1500rpm, 250 bar, 4000 rpm max
ALM2-R-12-E1: 8.3 cm³/rev, 11.8 L/min@1500rpm, 250 bar, 3500 rpm max
ALM2-R-13-E1: 9.6 cm³/rev, 13.7 L/min@1500rpm, 250 bar, 3000 rpm max
ALM2-R-16-E1: 11.5 cm³/rev, 16.4 L/min@1500rpm, 230 bar, 4000 rpm max
ALP Series (Gear Pumps)
ALP1 / ALP1A
Displacement: 1.4 – 13.8 cm³/rev
Continuous Pressure: 250 bar
Intermittent Pressure: 270 bar
Peak Pressure: 290 bar
Max Speed: 6,000 rpm
Weight: Approx. 1.3 kg (4.2 cc version)
ALP2 / ALP2A
Displacement: 4.5 – 35.2 cm³/rev
Continuous Pressure: 250 bar
Intermittent Pressure: 270 bar
Peak Pressure: 290 bar
Max Speed: 4,000 rpm
Weight: Approx. 2.5 kg (9.6 cc version)
ALP3 / ALP3A
Displacement: 20 – 87 cm³/rev
Continuous Pressure: 230 bar
Intermittent Pressure: 250 bar
Peak Pressure: 270 bar
Max Speed: 3,500 rpm
Key Technical Advantages
1. Lightweight Aluminum Construction – High Power Density
High-strength aluminum alloy housings with aluminum bushing-supported gears deliver exceptional power-to-weight ratios. ALP1A weighs only approx. 1.3 kg—ideal for mobile and compact industrial applications.
2. Bidirectional Rotation – Maximum Installation Flexibility
ALM series motors are bidirectional (reversible) , supporting both clockwise and counterclockwise rotation. Simplifies system design and field adaptation.
3. High-Speed Capability – Broad Operating Range
ALP1 reaches 6,000 rpm; ALM1 up to 5,000 rpm; ALM2 up to 4,000 rpm. Maintains stable performance from low-speed high-torque to high-speed continuous operation.
4. High-Pressure Rating – Industrial-Grade Durability
ALP1/ALP2 rated 250 bar, peaking at 290 bar. ALM series rated 250 bar, peaking at 270 bar. High-strength aluminum and precision gear manufacturing ensure long-term reliability.
5. Modular Design – Flexible Configuration
Extensive options for mounting flanges, drive shafts, and ports. SAE, European, and other international standards available for global installation compatibility.
6. 100% Simulated Duty-Cycle Testing
Every unit is 100% tested on dedicated hydraulic test benches under simulated real-world conditions—validating performance curves at rated pressure and full speed range.
Application Areas
Construction Equipment: Mini-excavators, loader hydraulic systems
Agricultural Machinery: Tractors, combine harvesters
Material Handling: Forklifts, lift platforms, stackers
Industrial Equipment: Machine tools, presses, injection molding machines
Mobile Equipment: Aerial work platforms, vehicle-mounted hydraulics
Wind Power: Pitch control hydraulic drive systems
Expert Maintenance Tips
1. Fluid Cleanliness Control
Maintain system fluid cleanliness to ISO 4406 19/17/14 or better. Install a 10–25 μm absolute filtration filter upstream of the inlet port.
2. Inlet Line Requirements
Keep suction lines short and straight with adequate diameter. Inlet pressure must be maintained between 0.8–2.0 bar (absolute) to prevent cavitation.
3. Coupling Alignment Precision
Ensure shaft coaxiality deviation ≤0.05 mm and angular deviation ≤0.5°. Flexible couplings are strongly recommended.
4. First-Start Priming Procedure
Before initial startup, bleed air through the drain port or a loosened outlet fitting. Perform 2–3 jog starts under no-load until oil fills the cavity without air bubbles.
5. Viscosity & Temperature Monitoring
Recommended operating viscosity: 12–100 cSt. Operating temperature: -20°C to +80°C. During cold starts, preheat fluid or reduce speed if viscosity is high.
6. Rotation Direction Confirmation
ALM “R” indicates reversible (bidirectional) ; ALP “D” indicates clockwise, “S” indicates counterclockwise. Always verify drive direction matches before installation.
