Servo Gearheads - DieQua Corporation

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ServoFoxx® Gearhead Technical Data

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Steps for Reducer Selection

    1. Determine output torque requirements of the gearbox. General formulas include:
      - For long term continuous operation: T2 CONT = input torque x ratio
      - For long term cyclic operation: T2 CONT = input torque x ratio x cycle factor

    2. Verify the input speed, cycle, and mounting position for proper lubrication option.

    3. Select the appropriate backlash value for the application.

    4. Determine if there are any radial or axial loads.

    5. Verify motor shaft diameter and length for bore capabilities.

    6. Determine if torque overload protection is required.

Input Speed

The input speed capacity of these gearheads is a function of size, cycle times, backlash, bearing loads, and gear ratio.

Continuous input speeds of 3000 RPM are generally acceptable for the reducers in this category, with the exception of some low ratio single stage models and certain SKP2FS series ratios. Cycle speeds of up to 8000 RPM are possible in some applications. Consult your DieQua representative for the maximum speed possible of the gearhead selected.


Two levels of backlash are offered. When selecting the appropriate backlash value for a given application, the speed and cycle times must be considered. Continuous high speed at the lowest backlash setting may create excessive noise and heat.

Radial Load Capacities

Radial load capacities are based on ratio, torque, speed, and cycles. Higher speeds or more cycles result in lower ratings. For series FS and PL2FS, consult the product selection chart for the approximate radial load capacity. For series PSK2FS and SKP2FS, consult your DieQua representative.


The operational life of any gearbox depends greatly on proper lubrication. The correct oil or grease applied to the gears and bearings acts as both a lubricant and as a coolant. Speed, torque, cycle times, and gearhead mounting position are the primary considerations in determining the correct lubrication option.

Because of the wide variety of models and configurations offered, different lubrication types are incorporated. Some are oil filled, some are grease filled, and some two and three stage designs have a combination of oil and grease in the different stages. Generally, all models are lubricated for the rated life of the unit and don't require lubrication changes.

When mounting any shaft in a vertical orientation, special considerations may be necessary. Please contact your DieQua representative for these proper lubrication options.


Other Data

For information on transmission error, axial load capacity, efficiency, or special design capabilities, please consult your DieQua representative.

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Bloomingdale, IL 60108-3105
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