TM 10-3930-659-20 17-13.    CONVEYORIZED FORK ATTACHMENTS 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. 3. Remove two screws (4), clamps (3), and conveyorized fork attachments (1) from side of forklift truck. 4. Using on-board crane (2), lower conveyorized fork attachments (1) to ground and remove on-board crane from conveyorized fork attachments (see TM 10-3930-659-10). TA707645 17-46