BS EN ISO 4254‑6:2020 pdf – Agricultural machinery – Safety Part 6: Sprayers and liquid fertilizer distributors.
1 Scope This document, to be used together with ISO 4254-1, specifies the safety requirements and their verification for the design and construction of mounted, semi-mounted, trailed and self-propelled agricultural sprayers for use with plant protection products (PPP) and liquid fertilizer application, as placed on the market by the manufacturer and designed for a single operator only. In addition, it specifies the type of information on safe working practices (including residual risks) to be provided by the manufacturer. When requirements of this document are different from those which are stated in ISO 4254‑1, the requirements of this document take precedence over the requirements of ISO 4254‑1 for machines that have been designed and built according to the provisions of this document. This document, taken together with ISO 4254-1, deals with significant hazards, hazardous situations and events relevant to sprayers and liquid fertilizer distributors when they are used as intended and under the conditions foreseeable by the manufacturer (see Annex A), excepting the hazards arising from: — protection of the driver against spray when spraying (see Foreword); — automatically actuated height adjustment systems; — the environment, other than noise; — moving parts for power transmission except strength requirements for guards and barriers. This document is not applicable to sprayers and liquid fertilizer distributors which are manufactured before the date of publication of this document. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 4254‑1:2013, Agricultural machinery — Safety — Part 1: General requirements
4.4.2 Powered height adjustment In the case of powered height adjustment systems that are manually actuated, it shall be possible to actuate the manual control from the driver’s position and the control shall be of the hold‑to‑run type. In the case of powered height adjustment systems that are automatically actuated, it shall be possible to override the system from the driver’s position. To ensure the protection of the operator against crushing and shearing hazards related to a failure of the control circuit of the height adjustment of the boom, the machine shall be fitted for those purposes with either: a) a device which limits the maximum downward speed of the boom to 10 mm⋅s −1 (measured at the centreline of the machine) during a hydraulic failure, or b) a device capable of stopping the boom lowering at a minimum height of 500 mm between the boom and the ground. For b), in those cases where the height needs to be reduced to less than 500 mm, a safety device shall prevent any lowering beneath 500 mm without an intentional and separate action of a safety device. If these safety devices are hydraulic valves not directly fitted to the cylinder, the lines connecting the valve to the cylinder shall be designed to withstand a pressure of at least four times the rated maximum hydraulic pressure. 4.5 Spray tank 4.5.1 Prevention of whole‑body access to the tank To limit the risk of access into the tank, any tank opening greater than 400 mm in diameter — or, if it is rectangular, of more than 400 mm × 300 mm — shall be provided with a grating which can only be removed by the use of tools. The openings in the grating shall not exceed the above‑mentioned dimensions. See also 6.1 g) and h) and 6.2.2.
4.5.2 Limitation of contact with chemicals 22.214.171.124 To minimize the risk of exposure to chemicals during filling/cleaning operations 126.96.36.199, 188.8.131.52 or 184.108.40.206 shall be applied. 220.127.116.11 Chemical induction bowls which are folded/unfolded manually shall be provided with a handle and locking mechanism for folding/unfolding that can be actuated without presenting a risk to the operator during operation. The handle can be an integral part of the chemical induction bowl provided it is suitably designed and clearly identified. Power‑assisted chemical induction bowls shall be able to be operated from a position that prevents the operator contacting the folding induction bowl while operating the folding control. The folding control shall be a hold‑to‑run control. The unintended unfolding of the chemical induction bowl during transport shall be prevented by a suitable means. The plant protection product container rinsing device shall be operated by a hold‑to‑run control. The rinsing device shall operate after a container is correctly positioned on the rinsing device in a way that prevents the discharge of liquid onto the operator. The rinsed liquid shall be directed to release into the induction system so that no liquid shall be ejected outside of the induction system. 18.104.22.168 The filling hole of the spray tank shall be so positioned that the height from the ground or platform is not more than 1 300 mm, with the horizontal reach between the rim of the hole and the outer edge of any part of the sprayer which could hinder the operator being not more than 300 mm at the operator filling position (see Figure 1).