Preventative and reactive maintenance on Crushers(jaw,cone and bar mech crushers)- changing worn out crusher liners, changing cylindrical bearing, replacing Vbelts, drive pulleys, maintaning lubrication system(changing oil seal,gear oil pumps,oil filters and change oil.). 2. Preventative and reactive maintenance in Screening machines( changing damaged cylindrical roller bearings, change oil seals, V-belt pulleys and maintaining lubrication system). 3. Maintaining conveyor belt( replacing worn out idlers, change V-belts, change bearings in driving and driven pulleys, change damaged gear boxes).