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This work presents the design and fabrication of a manually operated multi nut tightened and loose mechanism for simultaneous tightening and loosening of wheel nuts in automobiles. The developed mechanism is mainly intended to reduce human effort, operation time, and maintenance difficulties during wheel removal and fitting operations. Conventional wheel nut removal methods require separate operation for each nut using individual spanners or lug wrenches, resulting in increased labour and servicing time. The proposed system overcomes these limitations by using a planetary gear mechanism capable of operating multiple wheel nuts simultaneously. The mechanism consists of a central driving gear connected with multiple driven spur gears mounted on a triangular base plate. The rotational motion provided through the handle is transmitted equally to all driven gears, enabling synchronized motion of all wheel nut sockets. The design is based on a standard Pitch Circle Diameter (PCD) of 50 mm suitable for common automobile wheel arrangements. Important design parameters such as gear module, pressure angle, torque requirement, and material selection were considered during fabrication. EN8 mild steel was selected due to its good machinability, weld ability, strength, and durability. Experimental analysis was carried out by comparing the developed tool with conventional lug wrenches and pneumatic wheel nut removal systems. The observations indicate that the developed mechanism significantly reduces wheel servicing time and operator fatigue while improving maintenance efficiency. The tool is portable, economical, easy to operate, and suitable for garages, workshops, automobile service stations, and emergency roadside applications. The fabricated mechanism also eliminates the dependency on electrical power and compressed air systems. The developed manually multi nut tightened and loose mechanism successfully demonstrates the practical application of planetary gear arrangements in automobile maintenance operations. The project confirms that synchronized mechanical systems can improve operational efficiency, reduce maintenance complexity, and provide economical solutions for industrial and workshop applications