AS 3450 pdf download

AS 3450 pdf download.Earth-moving machinery — Wheeled or high-speed rubber-tracked machines — Performance requirements and test procedures for brake systems (ISO 3450:2011, MOD)
1 Scope
This International Standard specifies minimum performance requirements and test procedures for the service, secondary and parking brake systems of wheeled and high-speed rubber-tracked earth-moving machines, for the uniform assessment of those brake systems. It is applicable to the following earth-moving machinery, operating on work sites or in mining, or travelling on public roads: self-propelled, rubber-tyred earth-moving machines, as defined in ISO 6165; self-propelled rollers and landfill compactors, as defined in ISO 6165 and ISO 8811; self-propelled scrapers, as defined in ISO 7133; remote-control machines, as defined in ISO 6165, wheeled or rubber-tracked; derivative earth-moving machines with rubber tyres; earth-moving machines with rubber tracks and a maximum machine speed 220 km/h. . It is not applicable to pedestrian-controlled earth-moving machinery (see ISO 17063) or crawler earth- moving machines with steel or rubber tracks that travel at <20 km/h (see ISO 10265]. While purpose- built underground mining machines are not within the scope of this International Standard, its provisions can generally be applied to those machines with some braking performance modifications and additions (see Annex A]. NOTE At the time publication, no International Standard dedicated to purpose-built underground mining machines had been developed.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. . 3.1 brake system braking system all components which combine together to stop and/or hold the machine, including the brake control(s), . brake actuation system, the brake(s) themselves and, if the machine is so equipped, the retarder . 3.1.1 service brake system primary system used for stopping and holding the machine 3.1.2 secondary brake system system used to stop the machine in the event of any single failure in the service brake system 3.1.3 parking brake system system used to hold a stopped machine in a stationary position and which, if applicable, may also be part of secondary brake system 3.1.4 hydrostatic brake system hydrostatic or other similar propel drive system used to meet one or more of the brake system requirements 3.1.5 Braking system components 3.1.5.1 brake control component directly activated by the operator to cause a force to be transmitted to the brake[s) 3.1.5.2 brake actuation system all components between the brake control and the brake[s) which connect them functionally 3.1.5.3. brake brakes component which directly applies a force to oppose movement of the machine Note 1 to entry: The different types brake include friction, mechanical, electrical, regenerative devices and hydrostatic or other fluid types. 3.1.5.4 common component component that performs a function in two or more brake systems EXAMPLE Pedal, valve. 3.1.5.5 retarder energy-absorption device normally used to control machine speed 3.2 hydrostatic drive system hydraulic system where hydraulic motors form a direct drive to the wheels or track to propel the machine and slow machine movement 3.3 machine test mass operating mass of a machine which includes the heaviest combination of cab, canopy, operator protective structures (if required with all their components and mountings, any combination of equipment approved by the manufacturer of the machine, including operator and full liquid systems in accordance with ISO 6016 (e.g. machine configuration and direction of travel having the most adverse effect on braking) Note 1 to entry: For rollers, the sprinkler water reservoir(s) shall be full. Note 2 to entry: For self-propelled scrapers with semi-trailed units, towed trailers and all types dumpers, the machine test mass shall also include the maximum specified payload as per the machine manufacturer’s specifications. For all other machines, the payload shall not be included. 3.4 stopping distance distance travelled by the machine from the point on the test course at which the machine brake control actuation begins e.g. operator actuates the brakes) to the point on the test course where the machine is fully stopped Note 1 to entry: It is expressed in metres (m). Note 2 to entry: It does not take into account the operator reaction time, unless stated, but does take into account the system reaction time.