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Power take-off - PTO


A Power take-off (PTO) is a mechanical device controlled pneumatically, designed to transfer power from the gear box to the hydraulic pump or compressor device. A PTO is mounted directly on the gearbox, with the transfer direction and speed. Parameters, which characterize PTOs are: torque ratio, direction of rotation, mounting position and type of output from the PTO.



    Making the right choice of PTO requires the determination of the gearbox type in use. Typically, the gearbox has a nameplate that lists all important parameters.

Required data:

  • manufacturer's name,
  • type of the gearbox,
  • first gear ratio (if available).

You can find an example of the EATON gearbox below:



  1. EATON part number

  2. Customer number

  3. Description

  4. Type

  5. Serial number

  6. Data of production


Identifying the window opening for mounting the PTO


1. Upper mounting (SUP) 2. Lower mounting (INF)

3. Rear mounting 4. Right side mounting (DX) 5. Left side mounting (SIN) 6. Front mounting (ANT)

In case more than one window opening is available, you should choose the one involving a smaller overall dimension (an easier fitting of the PTO). More than one window opening can be used simultaneously, but it is necessary to evaluate available power generated by the gearbox. In case of several PTO applications, please contact out technical department.

Left/anticlockwise rotation (SX)                     Right/clockwise rotation (DX)


Rotation direction is a key factor for the correct choice of pumps or other mechanical devices that have to run in one rotation direction only. The rotation direction refers to the PTO with a rear output (the PTO output directed to the rear of the vehicle). The rotation direction is referred to the front output in case the PTO is not provided with the rear output. It is always marked with a special note in the catalogue.

ATTENTION! The PTO rotation direction is defined by looking at the output from the front. As a consequence, the pump must run in the opposite direction to the PTO.


It is a primary detail to check if the PTO is selected correctly. The location of the gear has to be compared with the center line of the window opening and with the motion vector of vehicle.


  A - front
  C - central
  P - rear

Direction of vehicle commotion


The position is defined by looking at the window opening from the front.


All speeds shown in the catalogue are calculated considering a nominal engine speed of 1000 rpm. Some gearboxes are provided with several speed levels that can be chosen by the gear stick selector. In our catalogue you can find all available speeds of each PTO.


The torque value in the output of the PTO depends on the constructional parameters. While selecting, the torque value should be taken into account when comparing specifications of the driven system. Torque values are reported in Nm. The torque value is an available maximum for each output.

ATTENTION! Always make sure that the absorbed torque of the gearbox is lower than the maximum value allowed by the gearbox itself.


For more details and help with the installation please consult our HYVA specialists who will gladly be helping you out.

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