A new integrated mechanization system is to be introduced for the oil palm plantation industry in Malaysia. The system consists of a four-wheeled drive multi purpose prime mover that is equipped with the respective attachments for conducting various tree crop field operations in both hilly and undulating terrains. The prime mover is a single chassis unit with a hydrostatic drive, oscillating drive axles and low ground traction tires. A diesel engine of 50.5 kW (67.7 HP) with rated speed of 2600 rpm is used to drive the main hydrostatic pump having a displacement of 46 cc/rev at a continuous pressure of 210 bar. The pump then runs two hydraulic motors having a displacement of 245 cc/rev at a continuous pressure of 205 bar with either series and parallel connection options to provide the required torque and speed at drive wheels of the prime mover. Proper prime mover wheelbase and ground clearance height have been employed to give better stability and maneuverability to the prime mover for the typical plantation terrain conditions. Mounting provisions for the seedling transplanting, fertilizer application, spraying application and the infield fruit collection-transportation were made on the prime mover. The available implement attachments have been designed to have a payload capacity of 20 seedlings for field transplanting of tree seedlings, 600 kg load for crop fertilizing, 450-liter tank capacity for crop spraying, and 1500 kg load for the infield fresh fruit bunches (FFB) collection-transportation.