Trigger in sqlserver 2012 to update Master with detail information

For reasons of agility, initially it is migrated to a table with name MtoRequerimiento 400 records with information to be able to perform the initial tasks with the following structure.

TABLE [dbo].[MtoRequerimiento](
[MtoRequerimientoId] [int] IDENTITY(1,1) NOT NULL,
[Partida] [int] NULL,
[Gpo] [nvarchar](10) NOT NULL,
[Gen] [nvarchar](10) NOT NULL,
[Esp] [nvarchar](10) NOT NULL,
[Dif] [nvarchar](10) NOT NULL,
[Var] [nvarchar](10) NOT NULL,
[Descripcion] [nvarchar](max) NOT NULL,
[Descripcion2] [nvarchar](max) NULL,
[Descripcion3] [nvarchar](max) NULL,
[Uni] [nvarchar](10) NOT NULL,
[Cant] [nvarchar](10) NOT NULL,
[Tipo] [nvarchar](10) NOT NULL,
[Clase] [nvarchar](10) NULL,
[Pmr] [float] NOT NULL,
[Comentarios] [nvarchar](max) NULL,
[MtoProcedimientoId] [int] NOT NULL,
[MtoUsuarioId] [int] NOT NULL,
[Maximo] [float] NULL,
[Minimo] [float] NULL,
[PrecioTira] [float] NULL,
[MaximoTira] [float] NULL,
[Fuentes] [int] NULL,
[RequiereRegistroSa] [bit] NULL,
[TipoPrecio] [nvarchar](max) NULL,

Well, now after I need to do a migration of about 3,000 records as a detail of the Mtorequerimiento table, the detail has the following structure

TABLE [dbo].[DetalleZona](
[DetalleZonaId] [int] IDENTITY(1,1) NOT NULL,
[MtoRequerimientoId] [int] NOT NULL,
[Maximo] [float] NOT NULL,
[Minimo] [float] NOT NULL,
[MtoZonaId] [int] NOT NULL,

Now what I want is to shoot a tigger when an insert, update or delete is made in the table DetalleZona to be able to update the fields Maximo , Mimimo of the table mtoRequerimiento with the sum of each MtoRequerimientoId .

I have the following tigger, but it updates all the records in the mykeep table.

ALTER TRIGGER  [dbo].[UpdateMaximoMinimo]
ON [dbo].[DetalleZona] 
FOR  insert, update,delete 
AS

BEGIN TRANSACTION 
        BEGIN TRY                       
                UPDATE MtoRequerimiento SET Maximo = TUpdate.Maximo, Minimo= TUpdate.Minimo
                FROM MtoRequerimiento t1, (SELECT T1.MtoRequerimientoId, SUM(t2.Maximo) Maximo,SUM(t2.Minimo) Minimo
                                                          FROM MtoRequerimiento t1, DetalleZona t2
                                                          WHERE t1.MtoRequerimientoId=t2.MtoRequerimientoId
                                                          GROUP BY t1.MtoRequerimientoId) TUpdate
                WHERE t1.MtoRequerimientoId = TUpdate.MtoRequerimientoId

                 /* confirmo las modificaciones*/ 
                COMMIT TRANSACTION 

        END TRY
BEGIN CATCH

    /* Hay un error, deshacemos los cambios*/ 
    ROLLBACK TRANSACTION 

    PRINT 'Se ha producido un error!'

END CATCH