Product Overview
The MR7000M-P1N1N1N1N0200/45561 is a large-displacement radial piston hydraulic motor from the Parker Denison Calzoni MR series, MR 7000 frame size. The motor features Calzoni‘s patented hydrostatic oil column transmission, in which pressurized oil columns transmit stator reaction forces directly to the rotating shaft, eliminating the connecting rods and piston pins found in conventional radial piston motors. This design fundamentally removes connecting-rod bearing friction losses and thrust loading, achieving mechanical efficiency up to 96%, volumetric efficiency up to 99%, and starting torque up to 95% of theoretical value.
The MR7000M offers a geometric displacement of 6967.2 cm³/rev (425.2 in³/rev), continuous working pressure of 250 bar, intermittent pressure of 300 bar, peak pressure of 420 bar (6000 psi), maximum speed of 130 rpm, and minimum speed of 0.5 rpm. This model is specifically designed for heavy-duty drive applications requiring extremely high torque at very low speeds, ideal for winches, injection molding machines, and marine thrusters.
The motor offers complete interchangeability: the 450 h7 mounting flange, splined output shaft (DIN 5480 standard), and SAE high-pressure flange ports are identical to the original Parker Calzoni specification. Every unit undergoes 100% simulated duty-cycle testing before shipment.
Brand Note: The Calzoni hydraulic motor product line was formerly owned by Parker Hannifin; effective April 2024, Parker sold its Calzoni facility in Italy to Calzoni Hydraulics Italy srl, with Parker continuing to operate the sales channel for products manufactured at the facility. MR series motors can also be directly interchanged with Italgroup motors.
Series-Related Models: The MRA2400H belongs to the MRA series, with displacement approximately 2400 cm³/rev and maximum working pressure of 280 bar. The MR2800I offers a displacement of 2792 cm³/rev, continuous pressure of 250 bar, and maximum speed of 215 rpm. The MRD300D belongs to the MRD dual-displacement series, with displacements from 300 cc/rev. The MRE1400G offers a displacement of 1369.5 cm³/rev, continuous pressure of 230 bar, and maximum speed of 280 rpm.
Technical Specifications
MR7000M-P1N1N1N1N0200/45561 (Primary Model)
Model: MR7000M-P1N1N1N1N0200/45561
Brand Series: Parker Denison Calzoni MR
Motor Type: Radial piston, fixed displacement, low-speed high-torque
Geometric Displacement: 6967.2 cm³/rev (425.2 in³/rev)
Continuous Working Pressure: 250 bar (3626 PSI)
Intermittent Working Pressure: 300 bar
Peak Pressure: 420 bar (6000 PSI)
Minimum Speed: 0.5 rpm
Maximum Speed: 130 rpm
Theoretical Specific Torque: Approx. 110.9 N·m/bar (reference: MR7000 series data)
Maximum Output Torque: Approx. 27725 N·m (@250 bar, theoretical)
Mechanical Efficiency: Up to 96%
Volumetric Efficiency: Up to 99%
Starting Torque: 95% of theoretical value
Mounting Flange: 450 h7
Shaft Type: Male spline (DIN 5480 standard)
Seal Material: Buna-N (Nitrile)
Port Connections: High pressure SAE metric flange (6000 psi)
Rotation: Clockwise (reversible operation)
Weight: Approximately 110 kg (reference: MR7000 series data)
Operating Temperature Range: -30°C to +80°C
Fluid Compatibility: Mineral oil, biodegradable fluids, fire-resistant fluids
MR2800I-P1N1N1N1N0500/58152 (Series Reference)
Model: MR2800I-P1N1N1N1N0500/58152
Brand Series: Parker Denison Calzoni MR
Motor Type: Radial piston, fixed displacement, low-speed high-torque
Displacement: 2792 cm³/rev
Continuous Working Pressure: 250 bar
Intermittent Working Pressure: 300 bar
Peak Pressure: 420 bar
Minimum Speed: 0.5 rpm
Maximum Speed: 215 rpm
Mounting Flange: 335 h7
Shaft Type: Splined shaft (DIN 5463 standard)
MRE1400G-N1N1F1N1N1000/60948 (Series Reference)
Model: MRE1400G-N1N1F1N1N1000/60948
Brand Series: Parker Denison Calzoni MRE
Motor Type: Radial piston, fixed displacement, with brake
Displacement: 1369.5 cm³/rev
Continuous Working Pressure: 230 bar
Maximum Speed: 280 rpm
Mounting Flange: 250 h7
Weight: Approximately 140 kg
MRA2400H (Series Reference)
Model Frame: MRA2400H
Brand Series: Parker Denison Calzoni MRA
Motor Type: Radial piston, fixed displacement, single piston row
Displacement: Approximately 2400 cm³/rev
Maximum Working Pressure: 280 bar
Typical Applications: Injection molding machines, mining equipment, marine winches, oil drilling
MRD300D (Series Reference)
Model Frame: MRD300D
Brand Series: Parker Denison Calzoni MRD
Motor Type: Radial piston, dual displacement
Displacement Range: From 300 cc/rev
Peak Pressure: 420 bar
Maximum Working Pressure: 300 bar
Features: Dual displacement design for drive applications requiring speed switching
Key Technical Advantages
① Patented Hydrostatic Oil Column Transmission — Elimination of Connecting-Rod Friction
The core innovation of the Calzoni MR/MRE series is the elimination of the connecting-rod mechanism found in conventional radial piston motors. Pressurized oil columns transmit stator reaction forces directly to the eccentric shaft, without connecting rods or piston pins as force-transmission intermediaries. This design removes connecting-rod bearing friction losses and thrust loading, achieving mechanical efficiency of 96% and volumetric efficiency of 99%. For continuous-duty or heavy-load breakaway applications such as winches and injection molding machines, this efficiency advantage translates directly into significant energy savings and reduced operating costs.
② Five-Piston Configuration — Low-Speed Smoothness and Precise Positioning
The five-piston radial layout with a low-excitation-frequency eccentric shaft enables smooth operation at extremely low speeds (minimum 0.5 rpm) without stick-slip. Torque output is remarkably smooth even at low speeds, and the motor exhibits high-performance starting characteristics even under load. For applications requiring precise angular positioning (injection molding machine turntable drives, rotary indexing tables), this characteristic ensures positioning accuracy and repeatability.
③ High Starting Torque — Superior Heavy-Load Breakaway Capability
Starting torque reaches up to 95% of theoretical value. In winch, slew drive, and other applications requiring breakaway of high-inertia loads, the motor delivers near-theoretical maximum instantaneous torque, avoiding starting difficulties or system pressure surges.
④ High Thermal Shock Resistance and Wide Temperature Range — Adaptable to Demanding Industrial Environments
The motor exhibits high resistance to thermal shocks, with an operating temperature range of -30°C to +80°C. In injection molding, metallurgical equipment, and other applications with significant temperature fluctuations, the motor maintains stable output performance, avoiding efficiency degradation caused by thermal expansion-induced clearance changes.
⑤ Compact Lightweight Design and Broad Interchange Compatibility
Compared with other motors of the same capacity, Calzoni‘s innovative design significantly reduces weight and overall dimensions. The MR7000M’s standardized mounting interface (450 h7 flange, DIN 5480 splined shaft, SAE high-pressure flange ports) allows direct replacement of equivalent Parker Calzoni original motors. MR series motors can also be directly interchanged with Italgroup motors, with mature aftermarket spare parts availability.
Application Areas
Winch Drives: Mooring winches, constant-tension mooring systems
Injection Molding: Turntable drives and clamping mechanisms
Marine: Steerable thrusters, deck machinery
Recycling Industry: Shredder drives
Mining: Slew drives, underground LHDs
Offshore Engineering: Jack-up platform lifting systems
Material Handling: Heavy-duty coilers, rotary tables
Industrial Transmission: Hydraulic systems requiring low-speed high-torque direct drive
Expert Maintenance Tips
Pre-Installation Inspection: Verify flatness and cleanliness of the 450 h7 mounting flange mating surface. Spline shaft-to-coupling fit must conform to DIN 5480 standards; avoid interference fits. Use bolts of strength class 8.8 or higher, tightened in diagonal sequence to specified torque.
Casing Oil Filling: Before initial start-up, the casing must be filled with clean hydraulic oil through the highest casing port. Dry starting causes metal-to-metal contact in the hydrostatic oil column transmission components without lubrication, resulting in irreversible damage.
Fluid Cleanliness and Temperature Control: Maintain system oil cleanliness at NAS Class 9 or better. Viscosity range 18–1000 mm²/s, with recommended operating range of 30–50 mm²/s. Oil temperature should remain within the -30°C to +80°C range.
Scheduled Inspection: Check casing drain flow every 500 operating hours. If stick-slip or torque fluctuation occurs, inspect the contact condition between pistons and stator curve surfaces. Monitor low-speed (0.5–5 rpm) operating smoothness.
Long-Term Storage Protection: If the motor will be idle for more than 3 months, fill the casing with rust-preventive hydraulic oil and manually rotate the shaft several turns monthly to prevent corrosion of hydrostatic oil column interfaces and bearings.
