TM 9-2320-209-20-3-4 b. Unlocking. FRAME 1 1. Start engine and raise dump body (1) to free two hoist braces (2). Refer to TM 9-2320-209-10. 2. Swing two hoist braces (2), one on each side, down to stowed position. 3. Lower dump body (1) and stop engine. Refer to TM 9-2320-209-10. END OF TASK 19-128