Hydraulics. Fast, precise, powerful action for lifting all attachments and positioning them with no operator effort. Driven by hydrostatic system's charge pump. One lever controls front attachments. Another controls center or rear attachments.
Operator convenience. Easy to get on or off. Controls all conveniently located within easy reach. Instrument panel is easy to read. Comfortable seat adjusts to suit any operator. Footrests and pedals are non-skid for safety.
Reliable 19-1/2hp Onan engine. It's demonstrated amazing dependability in hundreds of thousands of hours. Air-cooled, to end radiator problems. No oil mixing, thanks to 4-cycle design. Full-pressure lubrication with oil filter. Stellite valves with rotators. Modern short-stroke over-square design.
(Source: The New Size Tractor Simplicity 4041, Form 21-008, hand-dated 10-17-72, courtesy of Chris Geise)