corrigendum - replacement of damaged drums , idlers etc . of various conveyors in np / offsite area , fact-cd . , replacement of damaged drums , idlers etc . of various conveyors in np / offsite area , fact-cd . , replacement of drive drums , tripper drums tail drums , bend pulleys , snub pulleys etc . of bagging plant / product conveyors . work involves: the belt shall be arrested properly with belt clamps , after lifting the gravity weight . the damaged drum with plummer block and bearings shall be dismantled and taken to offsite mechanical . spare drum shall be transported to work site from off site / stores / workshop and positioned at the required place . new bearings and plummer block at both side shall be fixed properly with lubricant . the drum shall be aligned / fixed to the connecting part , as per instruction of the engineer-in -charge . if required , zero speed sensor shall be provided for tail end drum . release belt clamps , provide required gravity weight and service the conveyor on load , with out any sway . , replacement of troughing idlers in bagging plant / product conveyors . work involves: the required troughing idlers shall be transported from plant area / stores to site . the damaged troughing idlers of conveyors in np offsite / bagging plant area shall be replaced , as per the instructions of engineer - in -charge . damaged troughing idlers shall be transported to off site / scrap yard . , replacement of return idlers / clamps of bagging plant / product conveyors . work involves: the required return idlers / clamps shall be transported from plant area / stores to site . the damaged return idlers / clamps of conveyors in np offsite / bagging plant area shall be replaced , as per the instructions of engineer - in -charge . damaged return idlers / clamps shall be transported to off site / scrap yard . , servicing of damaged return idlers of 750mm wide bagging plant / product conveyors . work involves : re usable rubber disc shall be removed from the damaged return idlers . return idlers shall be serviced / repaired by replacing the rubber discs / bearings as per the instructions of the engineer-in -charge . the serviced return idlers shall be kept properly at off site area as spare . , replacement / servicing bearings of various conveyor drums . work involves: the belt shall be arrested properly with belt clamps , after lifting the gravity weight . the bearings / plummer blocks at both side of drum shall be replaced with new / serviced one . bearings shall be lubricated properly with grease . the drum shall be aligned / fixed to the connecting part , as per instruction of the engineer-in -charge . release belt clamps , provide required gravity weight and service the conveyor on load , with out any sway . [one set means , 02 bearings] .