Calzoni MR Hydraulic Motor: Specs and Selection Guide

The Calzoni MR is a fixed-displacement radial piston hydraulic motor for applications that require high torque at controlled speeds. Calzoni lists 36 displacement options from 60 to 9,000 cm³/rev across ten frame sizes, with series torque up to 35,000 Nm. The exact operating limits depend on the selected model and its operating diagram.

What does the MR series offer?

A fixed-displacement motor has a set geometric displacement per revolution. In practical terms, output speed is related to the supplied flow, while torque is related to pressure differential and displacement. Efficiency, leakage, temperature and operating conditions affect the actual result.

Do not use the series maximum as the design point for every MR motor. Check continuous and intermittent operating limits for the selected frame, displacement and pressure.

Where is a fixed-displacement MR motor a practical fit?

The MR series may be considered when the drive has a relatively stable displacement requirement and speed is controlled through hydraulic flow. Application examples include winches, industrial handling equipment, marine machinery and mobile equipment. The suitability depends on load profile, duty cycle and the hydraulic circuit.

For a winch, calculate line pull, drum radius, rope layers and required speed. For an industrial drive, define starting torque, continuous load, acceleration and reversal frequency. Those values provide a more useful basis for motor sizing than a general statement such as high torque.

MR motor selection: five details to confirm

· Continuous, peak and starting torque at the motor shaft.

· Required speed range and pump flow available at the motor.

· Working pressure, pressure spikes and return-line conditions.

· Shaft type, flange, shrink-disk arrangement and rotation direction.

· Brake, gearbox, manifold, sensor and seal requirements.

The accessories matter. Calzoni lists optional gearboxes, parking brakes and built-on manifold blocks for the MR series. The catalogue also identifies shaft, speed-sensor, seal and connection-flange options. Availability can vary by frame and configuration.

Replacement checks are different from new-design sizing

For a replacement, match the complete designation rather than relying on displacement alone. Check shaft code, mounting dimensions, ports, rotation and any integrated brake. If the motor has a gearbox or manifold block, photograph the complete assembly and record the attached component codes.

For a new design, provide the operating points and hydraulic schematic. This helps the supplier review whether the proposed displacement and frame can meet the required torque-speed range without exceeding the applicable pressure or thermal limits.

Naboer’s Calzoni authorization applies to China. Buyers can send the model code, quantity and application details through the Naboer contact page. The authorization announcement provides the appointment details.

FAQ

Is the Calzoni MR a fixed-displacement motor?

Yes. The MR series is identified by Calzoni as a fixed-displacement radial piston motor.

What is the MR series displacement range?

The current MR product page lists 36 options from 60 to 9,000 cm³/rev. Confirm the exact model code before using a value for sizing.

Can an MR motor be supplied with a parking brake?

Calzoni lists parking brakes as an option. Confirm the brake size, motor frame and complete assembly code for the required configuration.

Can I replace an MR motor with one of similar displacement?

Not without checking frame, shaft, mounting, ports, rotation, pressure and accessories. Similar displacement alone does not establish interchangeability.