Ability to disassemble, diagnose, repair, and perform preventative repair measures on mechanical equipment including, but not limited to: pumps, gearboxes, reducers, couplings, seals, rotating elements, blowers, fans, hydraulic units, valves, chillers, and compressors. Johns Manville is a leading manufacturer and marketer of premium-quality insulation and commercial roofing, along with glass fibers and nonwovens for commercial, industrial and residential applications.