10/17/11 Dozer D11T 426 had trouble with the man lift it was latch in a up position and tagged out. On 10/19/11 The Mechanic & Operator worked on the man lift to repair a Bad Oil Reservoir The operator relied the latch pin and for the mechanic. The man lift dropped suddenly striking the mechanic in the left shoulder. Leaving a deep tissue bruise in the upper left arm.