procurement of spares of sept make 4ul type piv gear box for unit no 1 and 2 of 2x210 mw of ph i at sgtps mppgcl birsinghpur , radial bearing housing with nut & bolt , o ring , thrust bearing housing , wheel flange and face ( in pair ) , shaft ( single or double extension ) , key , levers , compensator casting with nut bolt , compensator cam r . h . thread , compensator cam l . h . thread , compensator pivot pin , compensator roller , sliding block , chain tightening nut ( r . h . ) , chain tightening nut ( l . h . ) , shoe , shoe lever , spring rod , shoe spring , clutch assembly of lever control ( external part ) consisting of sipping clutch disc , spring 23 t pinion with key & nut , circlip , woodruff key , pinion housing etc . in assembled condition , ratchet pinion assembly consist of control screw , racks with key , alignment fitting r . h . , alignment fitting l . h . , speed limit nut control bracket r . h . , control bracket l . h . etc . in assembled condition , foundation pad