ISO 500-1 : 2014
Agricultural Tractors - Rear PTOs - Part 1 : General Specs and Safety Requirements.
ISO 500-2 : 2004
Agricultural Tractors - Rear PTOs - Part 2 : Narrow-track Tractors - Safety Requirements.
ISO 5008 : 2002
Vibration - Agricultural Tractors and Machinery - Operator's Whole Body Vibration.