LEESON Basic Training - iProcesSmart.com

Service Factor Conversions for ReducersWith Electric or Hydraulic Motor InputDuration of Service Uniform Moderate Heavy Extreme(Hours per day) Load Shock Shock ShockOccasional 1/2 Hour --* --* 1.0 1.25Less than 3 Hours 1.0 1.0 1.25 1.503 - 10 Hours 1.0 1.25 1.50 1.75Over 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.Service Factor Conversions for ReducersWith Engine InputHydraulic or Electric Single Cylinder Multi-CylinderMotor Engines Engines1.00 1.50 1.251.25 1.75 1.501.50 2.00 1.751.75 2.25 2.002.00 2.50 2.25Special Environmental ConsiderationsGear reducers are extremely rugged pieces of equipment with long life inmost types of power transmission applications. Modern components,including seals and synthetic lubricants, are designed for sustained hightemperatureoperation. Extreme heat, however, can be a problem. As arule of thumb, maximum oil sump temperature for a speed reducer is200ºF, or 100ºF above ambient temperature, whichever is lower.Exceeding these guidelines can shorten the reducer’s life. Be sure to provideadequate air space around a reducer for heat dissipation. In somecases, it may be necessary to provide an external cooling fan. In a gearmotorapplication, the fan on a totally enclosed, fan cooled motor can alsoaid in cooling the reducer.Moisture or high humidity is another concern. A key instance of this is afood processing environment requiring washdowns. In such cases, considerreducers with special epoxy coatings, external shaft seals, and stainlesssteel shaft extensions and hardware. If a gearmotor is used, be surethe motor has similar washdown-duty features.-53-