AS 3450:2021 pdf free

09-06-2021 comment

AS 3450:2021 pdf free.Earth-moving machinery – Wheeled or high-speed rubber-tracked machines – Performance requirements and test procedures for brake systems (ISO 3450:2011, MOD).
4 General requirements
The requirements of this clause apply to all machines within the scope of this International Standard.
All brake systems shall be designed, constructed and installed such that contamination and/or its effects are minimized.
4.1 Required brake systems
4.1.1 All machines shall be equipped with
a) a service brake system.
b) a secondary brake system, and
c) a parking brake system.
Service, secondary and parking brake systems may share common components or functions and do not have to be three independent and separate systems.
4.1.2 No brake system (including hydrostatic systems) shall contain a disconnecting device such as a
clutch or shiftable gear-box which allows disabling of the brake, except for systems in accordance with a)
and/or b), as follows:
a) any device designed to disconnect the service or secondary brake power source for cold weather starting shall require application of the parking brake before disconnection can take place;
b) a parking brake disconnect (release) designed to allow movement of disabled machines shall be located outside the operators station unless it can be reapplied immediately.
4.1.3 All machines shall have service brakes of an equal nominal capacity rating applicable to each of the wheels (or equivalent) of at least one axle. Dumpers and sell-propelled scrapers with semi-trailed unit(s) shall have service brakes applicable to at least one axle of the towing machine and one axle of each semi-trailed unit.
4.1.4 For rollers, the service and secondary brakes shall apply to all power-driven drums and wheels. Each drum of a split drum shall have the same nominal brake torque. The brake of a single-drum roller and a combined roller shall apply to all wheels and to the drum.
4.1.5 If the parking brake is intended to stop creep movement, the parking brake system shall permit actuation of the parking brake during travel.
4.2 Common components
Service, secondary and parking brake systems can share common components. Where common components are used, the machine’s braking performance shall meet the requirements for secondary brake systems given in 4.5 and 4.7, as applicable. If there is a failure in any single component within the brake system — except for tyres, drum or track — braking performance shall be in accordance with Table 3.
Acceptable performance is achieved for common brake control failure as follows. If there is a failure with a common brake control (lever, pedal, etc.) used to actuate the combined service and secondary brake systems, and there is another dynamic braking capability provided with the machine (e.g. parking brake with dynamic braking capability), the dynamic braking capability shall stop the machine after the failure within 120 % of the stopping distance for secondary brakes (under secondary test conditions) in accordance with Table 3. This dynamic braking capability may be applied automatically and without modulation. An indication should he given to the operator simultaneous with, or before, application of the brake system, if applied automatically.
4.3 Brake control systems
All brake system controls shall be capable of being applied by an operator from the operating position. Parking brake system controls shall be arranged so that, unless immediately reapplied, they Cannot be released once applied.
Unintended brake control activation can be avoided through compliance with ISO 10968.AS 3450 pdf download.

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