A Sugarcane Harvester with Modular Knockdown Assembly The present invention relates to a sugarcane harvester with a modular 5 chain driven knockdown roller assembly (21). The modular knockdown assembly implements single hydraulic motor (2) located at either side of the support arm (18) and covered with motor cover (4). A centered shaft (10) carries shaft sprocket (12) and the hydraulic motor (2) carries motor sprocket (11) at its shaft which transmits the rotational power through drive chain (8) 10 to drum centered shaft (10), where drive chain (8) located inside support arm (18). The single hydraulic motor (2) substantially saves hydraulic energy of whole hydraulic system of machine. The present invention further discloses mechanical control system and method for adjusting orientations of knockdown rollers (21A) for sugarcane harvesters by mechanical linkage (19). 15 Furthermore, the design of modular knockdown roller assembly is in such a way that it eases out task of the technicians to have maintenance at scheduled intervals.