Product Manual

Special Environmental Considerations
Gear reducers are extremely rugged pieces of equipment with long life
in most types of power transmission applications. Modern components,
including seals and synthetic lubricants, are designed for sustained high-
temperature operation. Extreme heat, however, can be a problem. As
a rule of thumb, maximum oil sump temperature for a speed reducer
is 200ºF, or 100ºF above ambient temperature, whichever is lower.
Exceeding these guidelines can shorten the reducer’s life. Be sure to
provide adequate air space around a reducer for heat dissipation. In
some cases, it may be necessary to provide an external cooling fan. In a
gearmotor application, the fan on a totally enclosed, fan cooled motor
can also aid in cooling the reducer.
Moisture or high humidity is another concern. A key instance of this
is a food processing environment requiring washdowns. In such cases,
consider reducers with special epoxy coatings, external shaft seals, and
stainless steel shaft extensions and hardware. If a gearmotor is used, be
sure the motor has similar washdown-duty features.
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Duration of Service Uniform Moderate Heavy Extreme
(Hours per day) Load Shock Shock Shock
Occasional 1/2 Hour --* --* 1.0 1.25
Less than 3 Hours 1.0 1.0 1.25 1.50
3 - 10 Hours 1.0 1.25 1.50 1.75
Over 10 Hours 1.25 1.50 1.75 2.00
* Unspecified service factors should be 1.00 or as agreed upon by the user and manufacturer.
Hydraulic or Electric Single Cylinder Multi-Cylinder
Motor Engines Engines
1.00 1.50 1.25
1.25 1.75 1.50
1.50 2.00 1.75
1.75 2.25 2.00
2.00 2.50 2.25
Service Factor Conversions for Reducers
With Electric or Hydraulic Motor Input
Service Factor Conversions for Reducers
With Engine Input