CHASSIS MODIFICATIONS
2-31
DAILY 4x4
Print 603.93.761 Base - May 2007
Modifications of the Engine Cooling System
Modifications ofthe Engine Cooling System
2.11 Work on the Suspension
2.11.1 General Specifications
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Company authorisation must be obtained to re -work the suspension systems and springs (e.g.
additional spring leaves, different cambering etc.) since these are important components for the
operation of the vehicle.
As a general rule no modification of the parabolic springs is permitted. On vehicles equipped with these springs, installation of
elastic rubber c omponents may be authorised for special versions or operations in order to increase the stiffness of the suspension.
In very specific cases, and for specific uses, the possibility of adding an extra leaf to the parabolic spring may be evaluated. This
operation should be carried out only by specialised firms after approval from IVECO.
It is forbidden to fit a parabolic spring on one side an d a semi-elliptic spring on th e other side on the same axle.
On vehicles equipped with a load apportioning valve (LAV) for the braking system, modification of the rear suspension requires
adjustment of this LAV valve (see point 2.15).
Modifications to the rear suspension
Changing the features of the rear spring (e.g., no. of leaves, spring rate etc.) requires adjusting the brake load apportioning valve
so as not to alter the vehicle’s braking performance. When work on the suspensions follows rather large changes in the permitted
loads on the axle(s) or the to tal weight of the vehicle, it may be necessary to adapt the braking forces to permit compliance with
the requirements for the brake regulations in force. The necessary instructions will be given on the documentation issued by IVECO.
If the vehicle is equipped with the ABS system, no adjustment need be made.
If the modification of the specifications of the rear spring does not require changing loads on both axles and total weight, the brake
load apportioning valve must be adjusted by an IVECO dealer. So as not to alter the vehicle’s braking capacit y, it is necessary to
observe the ground load / brake pressure ratio (under various load conditions) given on the rating plate of the brake load
apportioning valve.
In these cases, to adjust the brake load apportioning valve, follow the instructions given in point 2.15.4, applying a load on hole 9
corresponding to the stiffness of the new spring.
It will be n ec essary to check the ground load / brake pressure ratio is o bserved for all load conditions.
Should this not be, contact IVECO for a further check on compliance with the brake regulations.
Changing the data on the rating plate of the load apportioning valve requires it to be replaced with a new one giving the new data.
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