MR7000M-F2N1N1S3NX0500/59346 Parker Calzoni Radial Piston Motor 400 Bar

Product Overview

The Parker Calzoni MR7000M-F2N1N1S3NX0500/59346 is a fixed-displacement, high-torque radial piston hydraulic motor developed for demanding low-speed and high-load applications.

Parker’s official MR/MRE documentation classifies the MR series as a fixed-displacement radial piston motor with front-flange mounting, hydraulic connection flanges and reversible rotation. The MR7000M uses a nominal displacement of 6967.2 cm³/rev, making it one of the largest standard MR-series motor sizes.

The Calzoni design uses a patented pressurized-oil-column principle instead of conventional connecting-rod, piston-shoe and pin arrangements. Parker states that this architecture reduces side forces, minimizes oval wear and reduces friction and leakage while providing high mechanical and volumetric efficiency and smooth torque at very low speed.

This makes the MR7000M particularly suitable for heavy-duty winches, drilling machinery, offshore systems, marine deck equipment and other hydraulic applications requiring high starting torque and large output torque at low rotational speed.

Technical Specifications

• Manufacturer: Parker Hannifin / Parker Calzoni
• Product Family: High Torque Radial Piston Motors
• Motor Type: MR
• Complete Model: MR7000M-F2N1N1S3NX0500/59346
• Construction: Fixed-displacement radial piston motor
• Frame Size: M
• Displacement: 6967.2 cm³/rev
• Specific Torque: 111.4 Nm/bar
• Minimum Speed: 0.5 rpm
• Maximum Speed: 130 rpm
• Continuous Pressure: 250 bar
• Intermittent Pressure: 300 bar
• Peak Pressure: 420 bar
• Maximum Summated Pressure A+B: 400 bar
• Maximum Continuous Power Without Flushing: 153 kW
• Maximum Continuous Power With Flushing: 250 kW
• Approximate Weight: 335 kg
• Mounting: Front flange mounting
• Rotation: Reversible
• Hydraulic Fluid: HLP mineral oil to DIN 51 524 Part 2; other fluids subject to compatibility requirements
• Recommended Operating Viscosity: 30–50 mm²/s
• Permissible Viscosity Range: 18–1000 mm²/s
• Maximum Fluid Contamination: NAS 1638 Class 9
• Recommended Long-Life Filtration: NAS 1638 Class 8 with β5 > 100 filtration capability.

Key Technical Advantages

1. Extremely High Displacement

The MR7000M provides 6967.2 cm³/rev displacement and a specific torque of 111.4 Nm/bar, making it suitable for applications where very high shaft torque is required at low hydraulic motor speed.

2. High-Pressure Capability

The official specifications distinguish:

• 250 bar continuous pressure
• 300 bar intermittent pressure
• 420 bar peak pressure
• 400 bar maximum A+B pressure

This pressure classification is essential for correct hydraulic circuit design and prevents the peak-pressure rating from being incorrectly treated as a continuous operating limit.

3. Patented Oil-Column Radial Piston Architecture

Parker Calzoni’s hydraulic motor design transfers force through a pressurized oil column rather than conventional connecting rods and piston shoes.

According to Parker, the design minimizes transverse forces, reduces oval wear and side loading, and lowers friction and internal leakage. The pressure-balanced rotary valve also compensates for thermal expansion.

4. Smooth Low-Speed Operation

The MR7000M is specified from 0.5 rpm, with a maximum speed of 130 rpm. Parker emphasizes smooth torque delivery at very low speed and strong starting performance under load.

This makes the motor well suited to:

• Heavy-duty winch starting
• Drum rotation
• Drilling systems
• Cable handling
• High-load rotary drives

5. High Continuous Power Capability

Parker specifies 153 kW without flushing and up to 250 kW with flushing for MR7000M continuous operation.

For high-duty-cycle applications, the flushing circuit is therefore an important part of the thermal management strategy rather than an optional afterthought.

6. Robust Mechanical Installation

The MR platform uses front-flange mounting and is supported by Parker’s dedicated radial-load and bearing-life engineering guidance. External mechanical loading must therefore be considered together with hydraulic pressure and speed when designing the drive system.

Application Areas

• Heavy-Duty Winches
• Marine Deck Equipment
• Offshore Machinery
• Drilling Equipment
• Oil & Gas Equipment
• Mining Machinery
• Large Industrial Rotary Drives
• Cable Reel Systems
• Material Handling Machinery
• Construction Machinery
• Heavy-Duty Hydraulic Drives
• Low-Speed High-Torque Applications

Parker currently presents its Calzoni radial piston motor technology as part of its high-torque hydraulic product portfolio and includes radial piston motors in oil & gas and offshore applications.

Expert Maintenance Tips

1. Use Flushing for High Continuous Power

Parker’s documentation states that case flushing is required when operating at high continuous power levels in order to maintain the required internal oil viscosity.

For demanding applications, the flushing circuit should be designed as part of the original hydraulic system rather than added after commissioning.

2. Maintain a Proper Case Drain Arrangement

The case drain must be arranged so that the motor cannot run empty after shutdown. Parker specifically addresses case-drain routing in its installation instructions.

3. Use a Rigid and Flat Mounting Surface

Parker specifies a flat, bending-resistant mounting surface and mounting screws meeting DIN 267 Part 3 Class 10.9 requirements, together with the prescribed tightening torque.

4. Maintain Hydraulic Cleanliness

For long service life, control contamination carefully:

• Maximum specified contamination: NAS 1638 Class 9
• Recommended long-life target: NAS 1638 Class 8
• Recommended filtration capability: β5 > 100.

5. Control Pressure Spikes

The 420 bar value is a peak-pressure rating, not a continuous operating pressure.

Frequent starts, stops and reversals should therefore be evaluated for transient pressure spikes. Relief-valve settings, charge pressure and dynamic pressure behavior should be verified during commissioning.

6. Verify the Complete Configuration Before Replacement

For MR7000M-F2N1N1S3NX0500/59346, replacement selection should verify:

Complete Model → Displacement → Shaft → Sensor Option → Seals → Connection Configuration → Rotation → Special Code → Mounting Dimensions → Nameplate

Matching only the MR7000M series designation is not sufficient for a true interchangeability assessment.

Engineering Position on the Original Title

The original title contains:

“MRA2400 MR2800 MRD300 MRE1400 Series MR7000M-F2N1N1S3NX0500/59346”

These are not all the same motor configuration. Parker’s documentation distinguishes MR, MRE and other derivative families, with different displacement and pressure characteristics. Therefore, for SEO and technical accuracy, the recommended primary product identity is:

MR7000M-F2N1N1S3NX0500/59346 Parker Calzoni High Torque Radial Piston Motor

and MRA2400, MR2800, MRD300 and MRE1400 should be treated as related-series/search terms rather than specifications of this exact motor.