2-38 CHASSIS MODIFICATIONS E UROCARGO Euro 4/5 Figure 2.15 91460 1. Original rear cross member - 2. Box section - 3. Connecting plate - 4. Ribbing plate 2.6.4.4 Tow hooks for centre axle trailers The use of centre axle trailers involues the use of tow hooks suitable for this purpose. The values of the trailer loads and of the permissible vertical loads are contained in the technical documentation of the manufacturer of the tow hook or on the production data plate (e.g. DIN 74051 and DIN 74052). There are also tow hooks with special type approval, whose values are greater than the ones mentioned in the above standards.
These hooks may in any case be subjected to restrictions depending on the trailers used (e.g. drawbar length). In addition this can imply that the rear cross member should be further reinforced and a subframe runner of larger size be fitted. 2.6.4.5 Remarks about the payload It should be ascertained that the static drawbar load does not cause the allowable load on the rear axle or axles to be exceeded and that the required minimum load acting on the front axle is adhered to see point 1.13.3.
2.6.4.6 Increasing the towable weight For those vehicles which IVECO regards as suitable for towing a trailer, a request may be submitted to evaluate the possibility of authorising a towable weight exceeding that which is normally permitted. Such authorisation will include the conditions that must be complied with and, where necessary, specifications concerning modifica- tions and work to be carried out on the vehicle. These include possible reinforcements to the standard cross member (see Figure 2.14), the instructions for installing a reinforced cross member when available, and those on the brake system to be made. The tow hook must be suitable for the new use.
Its connecting flange must match that of the cross member. To fasten the cross member to the chassis frame, preferably use flanged head nuts and bolts or hex head screws of minimum class 8.8. Use self-locking nuts. Installing a towing device Base - January 2008 Print 603.93.431