NBN ISO 12003-1:2021

This document specifies procedures for both the static and dynamic strength testing of roll-over
protective structures (ROPS) front-mounted on narrow tractors. It defines the clearance zone and
acceptance conditions for rigid or tiltable, front, two-post ROPS, including any associated rear fixtures,
and is applicable to tractors so equipped having the following characteristics:
— a ground clearance of not more than 600 mm beneath the lowest points of the front- and rear-axle
housings (not considering lower points on the axle differential)
— a fixed or adjustable minimum track width of one of the two axles of less than 1 150 mm
NOTE It is understood that the axle mounted with the wider tyres is set at a track width of not more
than 1 150 mm. Tyre track width is adjustable so that the outer edges of the narrower tyres do not extend
beyond the outer edges of the tyres of the other axle. Where the two axles are fitted with rims and tyres of
the same size, the fixed or adjustable track width of the two axles is less than 1 150 mm.
— a mass greater than 400 kg but less than 3 500 kg, unballasted, including the ROPS and tyres of the
largest size recommended by the manufacturer
— fitted with roll-over protective structures of the dual-pillar type mounted only in front of the
seat index point (SIP) and characterised by a reduced clearance zone attributable to the tractor
silhouette.
This document also specifies optional testing procedures for both seat anchorage points and folding
efforts of front-mounted ROPS designed to fold.