TM 9-2320-209-34-2-2 WARNING Derrick assembly (1) is heavy. Hold it up firmly when taking it off from over rack bar (2). It can fall and cause damage to equipment and injury to personnel. 1. Loosen but do not take out three screws (3) and nuts (4) which clamp derrick assembly (1) to derrick tube base (5). Soldiers 2. Take off derrick assembly (1) from over rack bar (2). A and B 3. Loosen but do not take out two screws (6). Pull derrick sheave assembly (7) out of derrick assembly (1). END OF TASK 17-711