Hydre-MAC Radial Piston Motor


A powerful high speed, low torque hydraulic motor built to go the distance

Eaton’s Hydre-MAC™ is a low-speed, high torque (LSHT) direct drive, radial piston motor – featuring a cam lobe design – for variable speed applications that use less energy to deliver more power when needed. The Hydre-MAC radial piston motor can deliver 900kW of power and up to 280,000Nm of torque at max pressures of up to 350 bar all while delivering over 94% efficiency. With a symmetrical, 18-piston/roller assembly design that eliminates side loading, and two inlet/outlet ports that reduce pressure drop at high power, the Hydre-MAC radial piston motor generates less heat and experiences less wear and tear.

Product Features

  • Eight cam lobes provide 144 power strokes per revolution, delivering class-leading, low-speed performance
  • Symmetrical design with 18-piston/roller assemblies ensures even loading of all components to reduce wear
  • Flame-hardened cam delivers long-lasting motor reliability
  • Load bearing surfaces on the Hydre-MAC radial piston motor are serviceable, including the stainless steel shaft seal wear ring, piston seal and bearing pad
  • Based on the same principals as the partially discontinued Hagglunds Marathon Motor and developed in partnership with MacTaggart Scott, the Hydre-MAC motor is direct, drop in replacement for the Marathon motor.  It uses the same shaft and mounting hardware, making switching costs a non-issue during replacement

Technical Information

  • Displacement: 12,000 cc/rev to 50,000 cc/rev
  • Power: up to 900kw
  • Max. Pressure – 350 bar
  • Rated Torque – 280,000Nm
  • Overall Efficiency: >94%


Created using a MacTaggart Scott heavy-duty motor design, the Hydre-MAC radial piston motor combines MacTaggart Scott’s motor expertise with Eaton’s extensive industry knowledge, and is ideal for offshore, marine, metal recovery, mining, pulp & paper and off-highway stationary applications
  • Offshore – Winches, Thrusters, Mud Pump Drives
  • Marine – Winches, Top Drives, Cutter Head Drives
  • Metal Recovery – Shredders, Feeders, Conveyors
  • Mining - Apron Feeders, Conveyors, Kiln Drives, Stacker/Reclaimer, Feeder Breakers, Crushers
  • Pulp & Paper - De-Barker, Pressure Feeders, Chemi-Washers, Conveyors
  • Off-Highway - Directional Drills, Large Trenchers, Dragline Winches, Road Prep Grinders

Featured Literature

Success Stories:

Hydre-MAC™ low-speed, high torque (LSHT) direct drive radial piston motor
Eaton's Hydre-MAC radial piston motor keeps Tolko's Kraft paper operation running smoothly.

Hydre-MAC Radial Piston Motor Brochure
Setting the standard for power, performance and reliability, Hydre-MAC motor is perfect for a variety of applications, from offshore and marine to mining, metal recovery and more.

Hydre-MAC Radial Piston Motor Technical Brochure
Product specifications and dimensions with cross reference.

Hydre-MAC Radial Piston Motor Catalog Catalog includes product specifications, performance data and dimensions

Articles and White Papers

Hydraulic drives market trends and offerings” by S. Krishnakumar, Eaton
This paper discusses the current market trends for low speed high torque hydraulic drives, principle of operation and latest offerings in this market.




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