REGULATING EQUIPMENT ( ATD ) 3 PULLEY TYPE WITH MODIFIED PULLEY GROOVE ( 3: 1 RATIO ) WITH USE OF NBC BALL BEARING 6305 LLU ( PART- I ) OR SKF BALL BEARING 6305- 2RS 1 ( PART- I ) OR FAG BALL BEARING 6305- 2RSR ( PART- II ) IN REGULATING EQUIPMENT AS PER RDSO SPEC. NO. TI/ SPC/ OHE/ ATD/ 0060 REV.- 2.