Rexroth Hägglunds MK series Inner curve radial piston hydraulic motor

The MK series is a family of low-speed, high-torque (LSHT) hydraulic motors manufactured by Bosch Rexroth under the Hägglunds brand — a name that carries decades of credibility in heavy industrial drive systems, particularly in mining, marine, and pulp and paper. Hägglunds motors became part of Rexroth's portfolio years ago, but the engineering DNA and the "Hägglunds" name have stayed intact because customers specifically ask for it.

Unlike axial piston motors that run at higher speeds and rely on gearboxes to bring torque down to usable levels, the MK series is a direct-drive, radial piston motor. It's designed to deliver very high torque at very low shaft speeds — often just a few RPM — without any mechanical reduction gearing. That single design choice eliminates a whole category of maintenance headaches: gearbox oil changes, alignment issues, backlash, and the extra footprint gearboxes demand.

Key Features of the MK Series Specifically

Within the broader inner-curve radial piston category, the MK series has a few defining characteristics engineers look for:

Compact, single-cam design — the MK series typically uses a single-row cam configuration, making it more compact axially than some multi-row competitors, which helps in space-constrained installations like winch drums or in-line drive shafts.

High torque range — MK motors span a wide torque range, from moderate industrial applications up through very large frame sizes capable of enormous output torque, making the series scalable across product lines rather than requiring a switch to a different motor family.

Robust bearing support — the motor's main bearings are designed to absorb heavy radial and axial loads directly, which means in many applications (like a winch drum) the motor can be mounted directly to the load without an external support bearing.

Sealed, contamination-resistant construction — built for outdoor, marine, and mining environments where dust, moisture, and temperature swings are constant threats.

Modular valve and control options — MK motors are commonly paired with counterbalance valves, brake units, and electronic control packages for precise speed and torque control in demanding process applications.

Typical Applications

The MK series shows up wherever engineers need high torque, low speed, and reliability under abuse. Some concrete examples:

Marine deck machinery — anchor windlasses, mooring winches, and towing winches, where the motor has to deliver full torque from a standstill in saltwater-exposed, high-vibration environments.

Mining and material handling — conveyor drives, apron feeders, and bucket wheel excavators, where the load is heavy, dusty, and often variable.

Pulp and paper mills — direct drives for pulpers, refiners, and slow-speed mixers, where smooth, low-pulsation rotation protects both the product and the mechanical components downstream.

Steel and metals processing — coilers, uncoilers, and roller table drives, where precise torque control at low speed prevents material damage.

Offshore and subsea equipment — winches and cable-laying systems that need compact, high-torque motors capable of operating reliably in remote or harsh conditions.

For more information on the MK hydraulic motor, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Q1: What industries rely most on the MK series?

A1: Marine and offshore, mining, pulp and paper, steel processing, and heavy material handling are the industries where MK series motors are most commonly specified, largely because these sectors demand high torque, low speed, and reliability in harsh operating environments.

Q2: Do MK series motors require special hydraulic fluid?

A2: They generally run on standard mineral-based hydraulic oils, but exact fluid specifications, viscosity ranges, and filtration requirements should always be confirmed against the specific motor's technical datasheet, since requirements can vary by frame size and application.

Q3: What is the price and delivery time of the MK hydraulic motor?

A3: The price and delivery time will be provided based on the model you specify.

Q4:How to purchase an MK hydraulic motor?

A4: You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products via various methods.