TM 10-3930-659-20 15-1. ON-BOARD CRANE MAINTENANCE (Con't). WARNING Use  extreme  caution  when  handling  heavy  parts.    Lifting  device  is  required  when  parts weigh over 50 lb (23 kg) for a single person lift, over 100 lb (45 kg) for a two person lift, and  over  150  lb  (68  kg)  for  a  three  or  more  person  lift.    Keep  clear  of  heavy  parts supported only by lifting device.  Failure to follow this warning may cause serious injury or death to personnel. 2. Remove    on-board    crane    (3)    from    support cylinder (4). TA706761 15-3