Iveco DAILY M.Y. 2012, Body Builder Instructions

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3-30
FITTING SUPERSCTRUCTURES D
AILY
Base - 02/2012 Printed 603.95.241
Installation of tanks and containers for bulk materials
3.8.2 Cranes on the rear overhang
It is advisable for this type of application to extend the subframe over the entire length of the vehicle that is available for the
body up to the area behind the cab. The dimensions of the longitudinal runners to be used are given in Table 3.10.
Considering the particular distribution of weights on the vehicle (load concentrated on the overhang) and in order to ensure the
torsion rigidity necessary for a good behaviour on road and during operation of the crane, the sub-frame must be strengthened in
accordance to the crane capacity. Therefore boxed profiles and bracing must be adopted (see point 3.1) near the rear suspension
and on the entire rear overhang (measure Lv) - see Figure 3.21.
The passage between boxed and open profiles must be well coupled, according to the examples shown in Figure 3.3.
In the area of the boxed profile, fastening to the vehicle chassis must be performed with shear resistant connections (sufficient
quantity plates, spaced max 400 mm), while still using the elastic fastenings in the front part. Check that under any loading condition
the weight on the front and rear axles respects the limit defined for each vehicle (see point 1.15).
Since the rigidity required by the sub-frame depends on various factors (e.g. crane capacity, sizing of the support base, tare of the
vehicle, overhang of the chassis) we cannot provide instructions for all situations; therefore the Bodybuilder must operate, if
necessary, also by means of behaviour tests on the vehicle stability. If after these measurements the rigidity is insufficient, the
Bodybuilder must take the appropriate measures to achieve correct construction.
The rear crane overhang (measure Lk see Figure 3.21) must be as limited as possible (not over 40% of the wheelbase) in order to
maintain good vehicle driving characteristics and acceptable stress levels for the chassis.
Table 3.10 - Cranes fitted on the rear overhang (subframe mounting with cleat plates)
Total torque M
G
max (kNm)
Models
Chassis
section at the
centre line
(mm)
0-20 20-30 30-40 40-50 50-60 60-70 70-80
Min. value for the subframe section modulus Wx (cm
3
)
1)
35C, 40C 114x70x4 32 57 71 E
45C, 50C 114x70x4 32 57 71 110 E
60C, 65C, 70C 174x69x5 23 23 32 42 71 E
Note = To be checked on a single case basis (forward the technical documents including the stress and stability calculations).
1)
When the subframe requires a high moment of resistance the latter shall be established also for the crane.
Table 3.10 shows that the subframe material yield limit is 360 N/mm
2
. NOTE