One day a crew was working on a steep hill and they wanted to leave the chipper disconnected from the truck so they could go work over the hill. The foreman told the climber to disconnect the chipper and the foreman set the hand brake but forgot to put the truck in a gear and left it in neutral. The climber put the chock blocks on the chipper and started lifting the chipper hitch. He felt the chipper leg getting hard to lift and asked the foreman to go help him. When they were both lifting they heard a pop sound and noticed the truck starting to go down the hill. The foreman started running to catch the truck and press the brake. He was lucky he got in the truck and stopped it.