Abstract: Employee #1 and a coworker-foreman, of W. F. Wilson and Sons, Inc., composed a two-man crew operating a rock crushing machine during site preparation work at a new housing construction site. They were preparing to temporarily shut down the rock crushing operation to perform a regular greasing of the machine, a routine they did every day at lunch time. The foreman was in the control cab, watching the machine operation while waiting for Employee #1 to get the greasing equipment ready. Suddenly, the coworker heard a fluttering sound and felt the machine bog down. He turned toward the engine area and saw Employee #1's arm fly up in the air, along with bits of clothing. He immediately shut down the machine and hurried down the entry ladder to the ground where he found Employee #1 lying on the ground with his left arm torn off, bleeding profusely. The foreman immediately radioed for medical assistance, but Employee #1 died almost immediately. Apparently, Employee #1 had climbed up the side of the machine on a portable ladder that they used in the greasing operation. He either fell or was pulled into an unguarded belt/pulley assembly when the set of coveralls he had draped over his arm became caught in the moving parts.