The American Society of Agricultural and Biological Engineers (ASABE) has adopted five international standards concerning front- and rear-mounted power take-off shafts for agricultural tractors.
- ANSI/ASABE AD500-1:2004 W/Cor. 1 (DEC2010), Agricultural tractors – Rear-mounted power take-off types 1, 2 and 3 – Part 1: General specifications, safety requirements, dimensions for master shield and clearance zone (adoption with deviations)
- ASABE/ISO 500-2:2004 (DEC2010), Agricultural tractors – Rear-mounted power take-off types 1, 2 and 3 – Part 2: Narrow-track tractors, dimensions for master shield and clearance zone
- ASABE/ISO 500-3:2004 (DEC2010), Agricultural tractors – Rear-mounted power take-off types 1, 2 and 3 – Part 3: Main PTO dimensions and spline dimensions, location of PTO
- ANSI/ASABE AD8759-1:1998 (DEC2010), Agricultural wheeled tractors – Front-mounted equipment – Part 1: Power take-off and three-point linkage (adoption with deviations)
- ANSI/ASABE AD8759-2:1998 (DEC2010), Agricultural wheeled tractors – Front-mounted equipment – Part 2: Stationary equipment connection (adoption with deviations)
The adoptions of the five ISO documents replaces two ASABE standards, ASAE S203.14, Front and Rear Power Take-Off for Agricultural Tractors, and ASAE S513, Agricultural Wheeled Tractors – Front Mounted Linkage. ASAE S203.14 is one of the oldest standards developed by ASABE, providing the original specifications for the 540-rpm rear PTO used on hundreds of thousands of tractors worldwide. It has been in continuous publication since the 1920s and was used as a basis for the development of the international standards adopted.
These adoptions further harmonize national and international standardization, a goal that facilitates manufacturing, safety advancements and product marketing worldwide.
