People often looked for constant technological advancement to gauge the progression of a piece of equipment. Mechanical drives used gearboxes, shafts, pulleys, chains and sprockets to drive the trencher chain. Mechanical gear is used to provide a variable output speed from a constant speed power source or to provide torque increase for a variable speed power source as in an automobile. Mechanical drives are less costly than competing electrical drives and their control is much simpler. The disadvantage of these drives is that they are not durable and cannot be controlled as precisely as electrical drives. They cannot transmit as much power as electrical drives when variable speed is essential. They are used in industries ranging from aerospace to mining and heavy industry. With the advanced technology, the working of mechanical drive has become more efficient. Specific characteristics like low-stress; universal mounting, high-strength monoblac casings, high-energy efficiency and low noise level are designed. Mechanical drives have internal spaces that have void spaces where residues can be deposited.