TM 10-3930-659-20 17-13.    CONVEYORIZED FORK ATTACHMENTS MAINTENANCE (Con't). e. INSTALLATION 1. Attach on-board crane (2) to two conveyorized fork attachments (1). 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. Using  on-board  crane  (2),  raise  conveyorized  fork  attachments  (1)  (see  TM  10-3930-659-10)  and  position conveyorized fork attachments on forklift truck. 3. Install two clamps (3) and screws (4) on conveyorlzed fork attachments (1) and forklift truck. 4. Remove on-board crane (2) from conveyorized fork attachments (1). FOLLOW-ON TASKS: • Lower on-board crane (see TM 10-3930-659-10). TA707650 17-51