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CHASSIS MODIFICATIONS
D
AILY 4x4
Base - May 2007 Print 603.93.761
Changing the Size of the Tyres
Dual circuit spring load proportioning valve (ABS)
This adjustment is made on each vehicle in the factory . It permits loading the vehicle or fitting standard bodies in c o mpliance
with the deceleration and road holding charact eristic required by th e relevant EC Directives.
The adjustment and control data are given on the appropriate ratin g plate, whose loc ation on the vehic le is given in the specific
literature.
Should it become necessary to adjust the braking load proportioning valve, this can be done following th e instructions given below
(see Figure 2.17).
When replacement rear springs have been fitted it is necessary for the rear suspension to settle properly. To set the valve correctly
the suspension must be settled in before making any adjustments to the valve. Load the vehicle partially (approximately 2/3 of its
maximum weight) and make a few runs over a rou gh surface, braking a number of times while travelling forwards and wh ile reversing.
- Connect the pressure gauges 1 and 2 to the pressure test points 3 upstream and downstream of the braking load proportioning
valve.
- Loosen the clamping screw 8 of the proportioning valve adjustment lever 7.
- Apply adjustment load specific to each model to hole 9, after loading the engine axle to the specified reference value. Check
the IVECO workshop manuals for the required values.
Figure 2.17
120363
The example shows the single-circu it braking load apportioning valve of th e 35C model
1. Pressure gauge upstream of the load apportioning valve - 2. Pressure gauge downstream of the load apportionin g valve - 3.
Test poin ts - 4. Braking load proportioning valve - 5. Connecting Rod - 6. Main lever - 7. Adjustment lever - 8. Clamping
screw - 9. Hole for applying calibration load
- Tighten th e clamping screw 8 to t he prescribed torque of 16÷19 Nm.
- Press the brake pedal until the control pressure of 100 bar is obtained in the circuit upstream the corrector.
- Verify that the output pressure corresponds to the value shown on the load proportioning valve plate, corresponding to th e
weight at ground of the rear axl e.
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