1972 983 caterpiller 63,240 pounds without counter weight or engine. Being unloaded by a 350 Valvo loader and a smaller machine with an inexperienced operator . It was to heavy so he kept dropping it . 75,500 lbs. operating weight. 1648, 983s made & less than 600 983Bs made. It needed a new crank & rod. 275hp 3 to 4 yd bucket, 9.5 ft. wide. The largest track loader caterpillar ever made.