tender for breakdown maintenance of vacuum pump 1c and readiness of spare vacuum pumps for replacement during breakdowns; 1 decoupling and dismantling of vacuum pump from the bed 2 dismantling and assembling of bearings, mechanical seals and casings of vacuum pump 3 dismantling and assembling of ist stage and ii nd stage impeller of vacuum pump 4 conducting dye penetrant test on vacuum pump ist stage impeller and its casing 5 conducting dye penetrant test on vacuum pump ii nd stage impeller and its casing 6 balancing the rotating assembly of vacuum pump (this work involvesloading and unloading of pump rotating parts from site to workshop site, balancing of ist stage & ii nd stage impeller and shaft of vacuum pump and back to site. 7 transporting and erection of vacuum pump in the bed 8 coupling and alignment of vacuum pump 9 charges for reconditioning of mechanical seal for shr21850 model edwards make vacuum pump of shaft dia 150 mm by fabrication & machining of new carbon face of mechanical seal.