Abstract: At approximately 2:30 p.m. on May 28, 1986, Employees #1 and #2 were relocating a Lorain 37078 hydraulic truck crane between two occupied buildings to set the steel for a building addition. Employee #2 was operating the carrier while Employee #1 was operating the superstructure. The carrier was stopped in the desired location but the ground was uneven. Employee #1 set the brakes on the superstructure, shut off the engine, got out of the cockpit, and began to walk toward Employee #2. Employee #1 then reentered the cockpit and hit the brake for the swing, but got no response. He started the engine and began to power the boom back over the carrier. This caused the unloaded boom to become overextended and the crane to tip over. Employees #1 and #2 were hospitalized. The outriggers had not been set.