It is written in the language of a mechanic and may include valuable detailed information such as specifications, torques, ranges, etc. If you are serious about repairs or restoration, you need the service manual. Parts Manual (PTS) - The parts manual has exploded views of all parts on the tractor, giving great detail on assembly and disassembly. It also includes a guide for ordering parts. It picks up where service manuals leave off.
If you do your own repairs, you need the parts manual. Operators Manual (OPT) - The operators manual (AKA owners manual) came with the tractor. It gives the owner/operator instructions, shift patterns, capacities anti freeze, crankcase, etc. And adjustment procedures brakes, clutch, etc.
This is a critical tool for operating and maintaining your tractor.