2-18 CHASSIS MODIFICATIONS E UROCARGO Euro 4/5 Modifying the wheelbase 2.4 Modifying the wheelbase 2.4.1 General specifications Any change to the wheelbase affecting the electrical circuits and/or entailing a relocation of the electri- cal/electronic components must be approved and performed according to the instructions provided in Chapter 5. ! As a rule, for each vehicle, modification to the wheelbase must be carried out on the standard wheelbase above or closer to the new wheelbase required. The measurements given in the written authorisations will apply in all cases particularly for extensions made to the longest standard wheelbase.
Frame cutting must be performed according to the indications given at point 2.3.4. Whenever permitted by the body size, wheelbases should be made equal to those planned in our production. This enables the original transmission shafts and previously defined cross- member positions to be used. When extending a wheelbase beyond the production longest planned, the vehicle used must have the longest production wheelbase to ensure the correct thickness side members are used. Particular care must be taken to comply with the limits set by national regula- tions particularly with regard to the limits for overall dimensions (where specified). Use only material shown at point 2.3.2.
The fitting of an additional pump and a dual circuit power steering unit, if not immediately available, will require authorisation and must only be installed by an authorised workshop. 2.4.2 Authorisation The alteration of the wheelbase for the 4x2 versions is permitted without specific approval by IVECO in the following cases: - If the wheelbase is to be lengthened and the new value is still within the standard range of length with the same side member section. These sizes are given in the specific technical documentation or in Table 2.7 and Table 2.8. - If the wheelbase is to be shortened without falling below the standard minimum values established for each model.
Provided the chassis converter gives sufficient guarantees from the technological and control point of view (qualified personnel, adequate operating processes, etc.). For the 6x2 and 6x4 versions the wheelbase may only be modified following specific approval by IVECO. Conversion must be carried out performed in compliance with these instructions by making the necessary changes and adjustments and taking the appropriate precautions (e.g., determining whether ECU parameters need updating, rearranging the exhaust pipes, ensuring compliance with specific load limits on the rear axle, etc.), by taking into due account the requirements specified for the original wheelbase lengths.
Generally, lengthening the wheelbase has a negative effect on the steering. Whenever national regulations require it, the limits on the overall dimensions must be observed as well as the limits concerning the effort applied on the steering wheel and the relevant operation times (e.g. ECE - R 79/01 standard or current EC Directive). Table 2.10 contain, the wheelbase extension limits for the various models, with series drive, at max load admissible on front axle and with tires admissible on vehicle.
Should vehicles with longer wheelbase be needed, for special applications, it will be necessary to fit various devicesaimed at improving the steering characteristics such as a reduction in the maximum permitted load on the front axle or the installation of wheels and tyres with shorter kingpin offset values. The fitting of an additional pump and a dual circuit power steering unit, if not immediately available, will require authorisation and must only be installed by an authorised workshop. 2.4.3 Effects on the steering Modifying the wheelbase Base - January 2008 Print 603.93.431