Agricultural machinery

BS EN ISO 4254-6:2020 pdf free.Agricultural machinery – Safety Part 6: Sprayers and liquid fertilizer distributors.
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 mms-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.
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 x 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 bJ. g) and h) and 6.2.2.
LImitation of contact with chemicals
To minimize the risk of exposure to chemicals during filling/cleaning operations 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 olliquid 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.
The illing 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 flling position (see Figure 1).
In case of liquid plant protection products, the sprayer shall be equipped with a means for
introducing plant protection products that controls the risk of chemical contact and inhalation when introducing plant protection products and when cleaning the plant protection products container.
Prevention of spillage and overflow
The actual overall volume of the spray liquid tank shall exceed the nominal volume by at least 5 %.
The lid shall be:
— attached to the machine, e.g. by means of a chain;
— fitted with a holding device ensuring a closed position either by means of a positive mechanical action or lids fixed by screwing;
— fitted so as to prevent leakage of the spray mixture, e.g. by means of a seal.
The level of liquid shall be indicated to the operator during filling and emptying. The nominal volume of the tank shall be marked.
A pressure-compensation device shall be fitted on tanks that are not designed to be put under pressure, in order to keep them at atmospheric pressure when emptying and filling [see also 61 b)1.
Protection from contact with spray mixture when draining
The operator shall be prevented from coming into contact with the spray mixture when emptying the tank. This requirement is met if
— the draining outlet can be opened without a tool (for example by means of a tap), and
— the flow is directed away from the operator.
An emptying device shall allow the complete emptying of the residue in the tank when the sprayer is in a horizontal position.
It shall be possible to collect the liquid at the outlet without contaminating the operator or
equipment parts.
The tank outlet shall be guarded against accidental opening (see ISO 16119-2:2013, 5.1.1.3.2).
See also 6J. g) and 6J. I).
4.6 Pressure indicator (manometer)
The sprayer shall have a spray liquid pressure indicator. The design of the pressure indicator shall be such that in case of a leakage there is no unreasonable hazard for the operator. This requirement Is deemed to be fulfilled if either:
— spray liquid carrying hoses are not located in the operator cabin, or
— additional protection shall be provided. e.g. by imperforate covers completely covering the hoses and their connecting devices so that exposure of leakage to the operator shall be avoided.
The working pressure(s) shall be clearly readable from the drivers position. Turning of the head and the upper body is acceptable.
For analogue pressure gauges, the minimum diameter of pressure gauge dial plate shall be:
— 63 mm where the gauge is positioned within the hand reach of the operator or between the tractor and the transverse vertical plane formed by the hitch points of the three-point linkage;
— 100 mm in all other cases.
The gauge case shall be isolated from the spray mixture.
Pressure exceeding the maximum working pressure shall be indicated — for example, on the analogue pressure gauge by a red marking and on a digital instrument by an (audible or optical) indication initiated when the pressure reaches the maximum working pressure. See also 6.1 n).
The sprayer shall be provided with a safety device that prevents the pressure from exceeding the maximum working pressure of the circuit by more than 20 %.
The adjustment of this safety device shall be protected against unauthorized or accidental modification. Its actuation shall not cause any spillage or leakage of liquid from the circuit.BS EN ISO 4254-6 pdf download.Agricultural machinery