... transfer case, main drive system, gear box, double-winch, mud pump, turntable, drill tower, feeding tools ... or work at night. Equipped with hydraulic winch, mast pulley block, assist pressure device of ... 40Max-pull force of main winch (KN)240Pull force of hydraulic assistant winch(single rope) (KN)40Max- ... pull force of hydraulic assistant winch (KN)160Lifting capacity of hook (KN)240Bearing ...