Page 10 - Hub City Catalog
P. 10

A.G.M.A. & Service Factor Load Class Information

        Class of Service and Service Factors




        The ratings for gear drives in this manual are based on a service   Table 1 indicates the relationship between service factors and
        factor of 1 .00, for uniform load and uniform power source, up   load classification numbers .
        to 10 hours of operation per day . For other operating conditions,
        the application horsepower or torque must be multiplied by the    The AGMA load classification numbers and service
        appropriate  service factor, to  determine the  equivalent gear   factors are based on a uniform power source . If
        drive power rating . A gear drive should be selected with a rated   other power sources are used, the service factors must
        capacity equal to or greater than the equivalent rating .  be converted using Table 2 . Determine the required
                                                              service factor with uniform power source . Locate that service
        A condensed service factor chart is located in the    factor in the first column and read straight across to obtain
        selection information pages for each type of gear drive or   required service factor with multi-cylinder or single cylinder
        reducer .                                             engines .

        AGMA service factors for worm and helical worm gearmotors   Service factors do not need to be used with thermal
        and reducers are listed on pages A-3 to A-4 .         ratings .

        AGMA load classification numbers for spur, helical & bevel gear-  The Class  Number and  Service  Factor charts  are for
        motors and shaft mount reducers are listed on pages A-5 to A-6 .  general guidelines in determining required service
                                                              factors .  Past experience may indicate that different
        AGMA service factors for spur, helical & bevel gear drives and   service factors are required . Consult the factory for
        reducers are listed on pages A-7 to A-8 .             unusual or severe applications, or when there are any safety
                                                              considerations .



        TABLE 1 – LOAD CLASSIFICATION NUMBERS

                            UP TO 3 HRS.    3 TO 10 HRS.   OVER 10 HRS.
            LOAD CLASS    TOTAL OPERATION  TOTAL OPERATION  TOTAL OPERATION
               (S.F.)
                             PER DAY         PER DAY         PER DAY
                I            Moderate        Uniform
               (1 .0)       Shock Load        Load
                II            Heavy          Moderate        Uniform
               (1 .4)       Shock Load      Shock Load        Load
                III                           Heavy          Moderate
               (2 .0)                       Shock Load      Shock Load


        TABLE 2 – SERVICE FACTOR CONVERSION BASED ON TYPE OF
        POWER SOURCE
                STEAM OR GAS TURBINE      MULTI-CYLINDER  SINGLE CYLINDER
             HYDRAULIC OR ELECTRIC MOTOR     ENGINE          ENGINE
                       1 .00                   1 .25          1 .50
                       1 .25                   1 .50          1 .75
                       1 .50                   1 .75          2 .00
                       1 .75                   2 .00          2 .25
                       2 .00                   2 .25          2 .50
                       2 .50                   2 .75          3 .00
                       3 .00                   3 .25          3 .50










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