Calzoni Hydraulic Motors: MR, MRD/MRV and MRT Range Guide

Primary keyword: Calzoni hydraulic motors   |   Secondary keywords: Calzoni radial piston motor; MR series; MRD/MRV series; MRT series; low-speed high-torque motor

Calzoni hydraulic motors are radial piston motors designed for low-speed, high-torque drive applications. The main product families include the fixed-displacement MR, dual-displacement MRD, variable-displacement MRV and large-frame MRT series. The right choice depends on the machine’s torque-speed profile, hydraulic circuit and mounting requirements.

How do the Calzoni motor families differ?

The MR series is a fixed-displacement option for applications with a defined displacement requirement. MRD provides two displacement settings, while MRV is designed for variable displacement. MRT covers larger displacement and torque requirements where the drive load is particularly demanding.

These are published series-level figures, not guaranteed ratings for every model. Frame size, displacement, pressure, speed, temperature and duty cycle determine the permitted operating point.

What is common across the range?

Calzoni describes its motors as using Fluid Column Technology. In the manufacturer’s explanation, pressurized fluid columns act on the eccentric cam to produce shaft rotation. This design description is useful when understanding the product family, but final motor selection should still be based on operating diagrams and the complete application data.

The manufacturer lists reversible rotation and motor/pump operation for these series. Pump operation has additional circuit requirements, including charge pressure where specified. Optional configurations can include gearboxes, parking brakes, built-on manifold blocks, speed sensors, seals and different shaft or flange arrangements.

Which applications should be assessed?

Low-speed, high-torque motors are considered in winches, material handling, marine equipment, mobile machinery and heavy industrial drives. The application determines which series is worth evaluating. A winch designer may prioritize line pull and drum speed, while a mobile-machine engineer may focus on wheel torque, packaging and shock loads.

· Start with continuous and peak torque, not only motor power.

· Define the required speed range and available pump flow.

· Check pressure limits at the motor ports and expected pressure losses.

· Confirm mounting, shaft, gearbox and brake interfaces.

· Review operating temperature, fluid type and duty cycle.

How should buyers narrow down a Calzoni motor?

For an existing machine, begin with the full motor designation and a clear nameplate photograph. Add the mounting dimensions, shaft details and hydraulic connections. For a new design, provide the torque-speed points, pressure, flow, duty cycle and mechanical layout.

A similar displacement does not make two motors interchangeable. Frame size, shaft code, rotation, port arrangement and optional brake or manifold configuration can change the fit. Ask for a model-specific confirmation before treating a candidate as a replacement.

Naboer has announced its appointment as an authorized Calzoni Hydraulics distributor for China. The announcement describes the covered product families and the authorization period. Buyers can review the Calzoni authorization announcement and contact Naboer with the machine data for an application review.

For distribution information, see Naboer’s Distribution Brands page

To discuss a requirement, use Naboer’s contact page

FAQ

Which Calzoni motor is fixed displacement?

The MR and MRT series are listed as fixed-displacement radial piston motors. MRD is dual displacement and MRV is variable displacement.

Is the MRT simply a larger MR?

Both are fixed-displacement radial piston motor families, but MRT covers a larger published displacement and torque range. Check the frame-specific data before comparing them.

Can Calzoni motors operate as pumps?

The manufacturer lists reversible motor and pump operation for the series. Pump operation requires the specified circuit conditions, including charge pressure where applicable.

Does Naboer’s authorization cover markets worldwide?

The certificate supplied for this project specifies China as the authorized distribution territory. Other territories should be confirmed separately.

Reference Sources

1. Calzoni hydraulic motor range

2. Calzoni technical downloads and documentation

3. Calzoni MR series radial piston motors

4. Calzoni MRD/MRV series motors

5. Calzoni MRT series motors

6. Nabtesco authorization announcement (Naboer official news)