CHASSIS MODIFICATIONS 2-45 E URO C ARGO E URO 4 - 5 2.11.6 Steering Axles Steering axles can be installed both intermediately and at the rear. They can be of the self-steering or power-steering types and be designed and installed in such a way that the required dependability and road safety are guaranteed. The self-steering axles must be fitted with a device controlled from the driver’s seat which is able to render them rigid when reversing. The installation of an axle whose power-steering is obtained by means of the original steering system of the vehicle requires specific authorisation from IVECO in relation to the suitability of the original components for the conversion in question.
In this case, it will be necessary for diagrams of the supplementary system to be submitted for our inspection. 2.11.7 Components and Suspension Manufacturing quality of all components used (axle, suspension, braking units, systems etc.) must be ensured in order to guarantee driving safety and good vehicle operation. Particular care and attention must be paid to the designing and construction of the suspension in consideration of its importance for the proper performance and handling of the vehicle on the road. The designed suspension may be either of the mechanical leaf-spring type, pneumatic with air actuated springs or of a mixed type.
Whatever type is used it must not negatively affect the handling characteristics of the vehicle and its components in terms of driving quality, comfort, road holding, working angle of the transmission and its working space in the case of an intermediate supplementary axle. The use of a compensating suspension, in particular off-road vehicles whether constant total or partial, is to be preferred because of its ability to maintain the load distributed to the two rear axles. Thus ensuring that both axles are able to react to both static and dynamic load in the manner contemplated by the builders and in compliance with the regulations in force where applicable.
Where the additional axle has its own independent suspension, the suspension characteristics must be proportional to those of the original rear suspension in relation to the static loads applied to the two axles. 2.11.8 Stabilisers When pneumatic suspension is used for the added axle, depending on the solution adopted, it may be further necessary to fit an antiroll bar in particular when a body with a high centre of gravity is used. Similar devices must be adopted with mixed suspensions on supplementary axle installations to ensure stability when tipper bodies are fitted and it is important that the specifications detailed in section 3.4 are followed.
Installing a Supplementary Axle Print 603.93.431 Base - July 2006 Revi - June 2007