MRE500E-P1T1N1N1N Calzoni Radial Piston Motor 497.9cc

Product Overview

The MRE500E-P1T1N1N1N 0101/58378 is a medium-displacement radial piston hydraulic motor from the Parker Denison Calzoni MR/MRE series, MRE 500E 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 MRE 500E offers a geometric displacement of 497.9 cm³/rev (30.4 in³/rev), continuous working pressure of 250 bar, intermittent pressure of 300 bar, peak pressure of 420 bar, and maximum speed of 600 rpm. The model code decodes as: “MRE” = fixed displacement with brake option, “500E” = displacement frame size, “P1” = control/pilot configuration, “T1” = shaft specification, “N1N1N1N” = port and mounting configuration code, “0101/58378” = factory serial and custom code.

MRE series motors normally start at maximum displacement, providing maximum starting torque for high acceleration. With no internal connecting rods, the motor significantly reduces frictional drag and thrust loading, while extending expected lifetime through static balance on the shaft.

The motor offers complete interchangeability: the 250 h7 mounting flange, six-bolt port connections, and splined shaft interface are identical to the original Parker Calzoni specification. Every unit undergoes 100% simulated duty-cycle testing before shipment.

Series-Related Models: The MRA2400H in the original title belongs to the MRA series, with displacement approximately 2400 cm³/rev, maximum working pressure of 280 bar, suitable for injection molding machines, mining equipment, and marine winches. The MR2800I offers a displacement of 2792 cm³/rev, continuous pressure of 250 bar, intermittent pressure of 300 bar, peak pressure of 420 bar, maximum speed of 215 rpm, and minimum speed of 0.5 rpm, with 335 h7 mounting flange. The MRD300D belongs to the MRD dual-displacement series, with displacements from 300 cc/rev and peak pressure of 420 bar. The MRE1400G offers a displacement of 1369.5 cm³/rev, continuous pressure of 230 bar, maximum speed of 280 rpm, and 250 h7 mounting flange.

Technical Specifications 

MRE500E-P1T1N1N1N 0101/58378 (Primary Model)

• Model: MRE500E-P1T1N1N1N 0101/58378

• Brand Series: Parker Denison Calzoni MR / MRE

• Motor Type: Radial piston, fixed displacement, low-speed high-torque

• Geometric Displacement: 497.9 cm³/rev (30.4 in³/rev)

• Continuous Working Pressure: 250 bar (3626 PSI)

• Intermittent Working Pressure: 300 bar

• Peak Pressure: 420 bar (6000 PSI)

• Maximum Speed: 600 rpm

• Minimum Speed: 0.5–1 rpm

• Theoretical Specific Torque: Approx. 7.9 N·m/bar (reference: MRE series data)

• Maximum Output Torque: Approx. 1980 N·m (@250 bar, theoretical)

• Mounting Flange: 250 h7

• Port Connection: Six-bolt connection (N1 configuration)

• Shaft Type: Splined shaft (DIN 5463 standard)

• Seal Material: NBR (Nitrile), optional FPM (Fluoroelastomer)

• Rotation: Clockwise/counterclockwise reversible

• Weight: Approximately 100 kg (reference: equivalent MRE series data)

• Fluid Compatibility: Mineral oil HLP (DIN 51524 Part 2), biodegradable fluids (on request), HFD requires FPM seals

• Operating Temperature Range: -30°C to +80°C

• Fluid Cleanliness Requirement: NAS 1638 Class 9 (Class 8 recommended)

MR2800I-N1N1V1C1N0500/58589 (Series Reference)

• Model: MR2800I-N1N1V1C1N0500/58589

• 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)

• Seal Material: Viton® (Fluoroelastomer)

• Connection Type: BSP threaded flange (ISO 22/1)

MRE1400G-N1N1F1N1N1000/60948 (Series Reference)

• Model: MRE1400G-N1N1F1N1N1000/60948

• Brand Series: Parker Denison Calzoni MRE

• Motor Type: Radial piston, fixed displacement, low-speed high-torque

• 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 applications such as injection molding machines and winches, this efficiency advantage translates directly into significant energy savings. With no connecting rods, the cylinder can only extend and retract linearly, so there are no transverse thrust components, effectively preventing oval wear of moving parts and lateral forces on cylinder hinges.

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 0.5–1 rpm) without stick-slip. For applications requiring precise angular positioning (injection molding machine turntable drives, rotary indexing tables), this characteristic ensures positioning accuracy and repeatability. Torque output is remarkably smooth even at low speeds, and the motor exhibits high-performance starting characteristics even under load.

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 MRE500E’s standardized mounting interface (250 h7 flange, six-bolt port connection) 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

• Injection molding machine turntable drives and clamping mechanisms

• Marine: Mooring winches, steerable thrusters, deck machinery

• Mining: Shredders, slew drives, roadheader star wheel drives

• Offshore engineering: Jack-up platform lifting systems, constant-tension mooring

• Material handling: Heavy-duty coilers, rotary tables, winches

• Recycling industry: Shredder drives

• Oil & Gas: Drilling equipment rotary drives

• Industrial transmission: Hydraulic systems requiring low-speed high-torque direct drive

Expert Maintenance Tips

Pre-Installation Inspection: Verify flatness and cleanliness of the 250 h7 mounting flange mating surface. Spline shaft-to-coupling fit must conform to DIN 5463 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 1638 Class 9 or better (Class 8 recommended), using filter elements with ß10 > 75 retention rating; ß5 > 100 filters are recommended for longer service life. Oil temperature should remain within the -30°C to +80°C range, with viscosity range of 18–1000 mm²/s and recommended operating range of 30–50 mm²/s.

Scheduled Inspection: Check casing drain flow and brake clearance 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.