[PDF] Operating Instructions and Parts Manual 3-1/2 ton Farm Jack 3.0 About this jack and manual The JET Model FJ-3-1/2A Farm Jack is a multi-purpose mechanical tool with the functions of a jack, hoist, winch, crane, and clamp. It is simple and easy to operate, inspect and service, and is especially suited for field operations. With regular maintenance your JET Farm Jack will provide years of dependable service.[PDF] 7000-LB. FARM JACK - Northern Tool 7000-LB. FARM JACK OWNER’S MANUAL WARNING: Read carefully and understand all ASSEMBLY AND OPERATION INSTRUCTIONS before operating. Failure to follow the safety rules and other basic safety precautions may result in serious personal injury.