Hydrostatic CouplingHYDROFLEX MA-L

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HYDROFLEX MA-L – Coupling with high fitting capability
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 rotating assemblies 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 coupling program for this application – also known as HYDROFLEX MA-L. VULKAN HYDROFLEX MA-L series couplings are specially designed for connecting hydraulic pumps to diesel engines via the power take off (PTO) shaft.

HYDROFLEX MA-L comprises a geared hub, connected to the hydraulic pump shaft, and a geared hub connected to the power take off shaft on the engine. Both hubs are connected via an internal geared polyamide sleeve to convey the engine power to the pump. A cast iron or aluminum pump support is then used for the hydraulic pump mounting.


  • Compensated axial, angled and radial displacement
  • High fitting capacity of the rotating assembly on most engines including Hatz, Honda, Briggs & Stratton etc.
  • Easy installation
  • Low maintenance

Technical Data

  • Nominal braking torque [Nm]
    51.50 Nm - 88.00 Nm


  • Designed to connect hydraulic pumps to diesel engines via the power take off shaft (PTO)