An employee was preparing to conduct maintenance on a riding lawn mower and lifted the mower deck upward to its vertical position with assistance from another employee. A third employee pulled a locking pin, causing the front wheel mount to move forward into the cab. The cab entrance hand hold crushed the little fingers on the injured employee's hands. The employee was hospitalized and required surgical amputation of the right little finger to the second joint, as well as debriding and stitches to the left little finger.