Abstract: An automatic, adjustable, quick attaching loader mechanism for fastening load carrying implements to the loader arms of end loading tractors. This mechanism provides two slots for receiving transverse positioning pins located in standard positions on the rear of various type of load bearing implements such as forks or scoops. A pivoting latch serves to lock the implement securely in position while a slidable lock holds the pivot latch in position. While the security of some attaching mechanism of this type may become suspect after long and continuous use due to the enlargement of the lower slots from wear, an adjusting mechanism is provided for maintaining a secure relation between the slidable lock and the pivot latch, thereby enabling the attaching mechanism to maintain various load carrying implements in a securely locked position throughout the life of the attaching mechanism.