Hydrostatic CouplingHYDROFLEX MA-M

[Translate to English:]

HYDROFLEX MA-M – Geared engine pump coupling application for multiple areas
Machines like small excavators, forklifts, mini dumpers, asphalt machines, concrete pumps, agricultural machinery etc use hydrostatic drives from a combustion engine, directly connected with a hydrostatic pump via a coupling. The coupling conveys the required force from the engine to the pump and consequently ensures proper machine operation. The coupling must also be able to be installed and plugged into the smallest area under the pump installation flange of the engine, so that the hydraulic pump can be flange-mounted directly to the engine. Hydrostatic applications generally require a rigid coupling to operate hydraulic pumps and similar machines with low torque of inertia below the critical speeds, whereby possible damaging resonances from the machine’s operating speed range are removed. VULKAN has developed its HYDROFLEX geared coupling program for this application – also known as HYDROFLEX MA-M, a geared coupling application for multiple areas, including coupling for hydraulic pumps.

VULKAN’s HYDROFLEX MA-M is a torsion coupling comprising two geared metal hubs connected via an internal geared polyamide sleeve. The rounded geared wheel profile enables the HYDROFLEX MA-M, to compensate axial, angled and radial displacement. It is also available with geared hubs with cylindrical bore holes with feather key groove, conical bore hole with feather key groove, spline shaft connection and hub clamping system.


  • Compensated shaft displacement with limited reaction forces
  • Different hub designs for most application requirements
  • Easy installation
  • Low maintenance

Technical Data

  • Torque Range TKN [kNm]
    0.01 kNm - 0.42 kNm


Designed for every conceivable industrial application, hydraulic pump included.