scope:

This European Standard specifies tests for the verification of dynamic lateral stability for counterbalanced lift trucks according to EN ISO 3691-1 that have a centre control, sit down, non-elevating operator, with a rated capacity up to and including 5 000 kg when travelling on smooth level ground with the forks in travelling position. The standard is not applicable for Rough Terrain Fork lift trucks. The requirements are specific to the various drive systems (e.g. Electric-/Internal-Combustion-Engine trucks), taking account of their varying influence on dynamic stability performance. Research has shown that driving backward in typical working operations like unloading of a lorry does not cause lateral instability. Due to this reason only driving forward needs to be tested. Risks due to falling off a loading dock or turning on a ramp are not covered by this standard. Risks due to lifting or manoeuvring operations are covered by the respective stability tests. To reduce the risk of lateral instability for lifting furthermore it is proposed to indicate this misuse by signals or by reduction of the driving speed when exceeding a certain lift height. This requirement is intended to be included in the respective standard in its next revision.