AS 3450:2021 pdf 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:
一self-propelled, rubber-tyred earth-moving machines, as defined in ISO 6165;
一self-propelled rollers and landfill compactors, as defined in ISO 6165 and ISO 8811;
一self-propelled scrapers, as defined in ISO 7133;
一remote-control machines, as defined in ISO 6165, wheeled or rubber-tracked;
derivative earth-moving machines with rubber tyres;
一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.
2 Normative references
The following referenced documents are indispensable for the application 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 6014, Earth-moving machinery – Determination of ground speed
ISO 6016, Earth-moving machinery一Methods of measuring the masses of whole machines, their equipment and components
ISO 6165, Earth-moving machinery – Basic types一Identification and terms and definitions
ISO 7133, Earth-moving machinery一Tractor-scrapers 一Terminology and commercial specifications
ISO 8811, Earth-moving machinery 一Rollers and compactors 一Terminology and commercial
specifications
ISO 9248, Earth-moving machinery 一Units for dimensions, performance and capacities, and their
measurement accuracies
ISO 10968, Earth-moving machinery一Operator’s controls .
ISO 15998, Earth-moving machinery – – Machine-control systems (MCS) using electronic components -Performance criteria and tests for functional safety
3 Terms and definitions
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
3.1.5.4 common component
component that performs a function in two or more brake systems
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.
AS 3450:2021 pdf Earth-moving machinery — Wheeled or high-speed rubber-tracked machines — Performance requirements and test procedures for brake systems (ISO 3450:2011, MOD)
