MAR57, it’s great to have, read and fully understand that manual, but the chapter regarding load chart interpretation was erroneous in almost all the Groves that I inspected over many, many years. Maybe they've corrected them since, but you should see for yourself. The practice scenario they give shows a final answer of ‘Net Lifting Capacity' that is in excess of both hook capacity and line pull. If that quality control blooper has been addressed then disregard my reply, and learn as much about the machine as you can from it, especially in the area of cautionary notes, and set up info for the lattice extension!