This document, used together with ISO 4254-1, specifies the safety requirements and their verification for the design and construction of silage block cutters and feed mixing machines (for example feed mixers, bale processors). Feed mixing machines can be stationary, mounted, semi-mounted, interchangeable towed or self-propelled machines that have a combination of two or more of the following functions: loading, mixing, chopping and distributing materials used for animal feed or bedding. In addition, it specifies the type of information on safe working practices to be provided by the manufacturer. This document does not apply to: – machines which pick up green fodder directly from the field; – loading cranes not attached to a feed mixing machine; – Autonomous feed mixing machines (including robotic feed systems dealt with in ISO 3991 (under preparation)) This document deals with the significant hazards, hazardous situations and events relevant to machines for loading, mixing and/or chopping and distributing silage and/or other feedstuffs, when they are used as intended and under the conditions foreseen by the manufacturer as listed in Annex A, except for the hazards arising from: – failure of the control circuit; – inadequate seating; – inadequate lighting; – travelling of machinery; – break-up of parts rotating at high speed; – cutting hazard during service on sharp parts (e.g. blades of the mixing and/or chopping device).