An employee was using a motor-driven lift to raise a tank of chicken to dump into another machine. The chain being turned by the motor misfed and stopped the lift, causing the motor to shake and loosen the bolts that anchored it to its housing. The employee lowered the tank, reset it on the lift, and began to raise it again when the motor fell approximately 10 feet from its housing and struck the employee's right forearm, resulting in a fracture and laceration.