DAILY 4x4 ‒ GUIDELINES FOR BODYBUILDERS
APPLICATIONS OF SUPERSTRUCTURES
3.8 INSTALLING A CRANE
21
– Printed 692.68.999 – 3 Ed. - Base 08-2020
Table 3.7 - Cranes mounted behind driver's cab (subframe secured with shear resistant plates)
Model
Frame section
[mm]
Total torque M
G
max [kNm]
20
20
30
30
40
40
50
50
60
60
70
70
80
80
90
90
100
Minimum value of the section modulus of the subframe section W
x
[cm
3
]
(1)
with yield point of the material equal to 360 N/mm
2
55C, 70C 174x69x5 19 19 21 46 57 89 E
Close the reinforcement section in the crane assembly area.
E = To be checked case-by-case. Send IVECO technical documentation with verification of stress and stability.
(1)
When a higher section modulus is required for the superstructure also use the latter for the crane.
Note
For the dimensions of the profiles see Table 3.2.
3.8.2 Crane on the rear overhang
The subframe should extend for the entire length of the vehicle to the rear part of the cab; The dimensions of the longitudinal
sections are shown in Table 3.8.
Considering the particular distribution of weights on the vehicle (load concentrated on overhang) and to ensure the necessary
torsional stiffness for good performance on the road and during the working phase of the crane, the subframe must be suitably
stiffened in relation to the crane capacity. Therefore, the use of (see Chapter 3.2 ) box sections and cross bracings in line with the
rear suspension and along the entire length L
V
(see Figure 16).
The passage between boxed sections and open sections must be well fitted as shown in Figure 4.
Shear resistant connections (a sufficient number of plates spaced at a maximum distance of 400 mm) must be used in the box
section for fastening to the chassis, given that elastic fastenings are used on the front end. Check that the ratio between front axle
and rear axle weight respects the limit defined for each vehicle under any load condition (see Chapter 1.15 ).
Considering that the necessary subframe rigidity depends on various factors (e.g. crane capacity, resting surface dimensioning,
vehicle tare weight, chassis overhang), instructions valid for all situations cannot be given. For this reason bodybuilders shall, if
necessary, proceed also by testing the vehicle's stability. If the test results show that rigidity is insufficient, the bodybuilder will adopt
suitable precautions so as to obtain correct realisation.
The rear overhang of the crane (measurement L
U
see Figure 16) must be as limited as possible (never exceeding 40% of the
wheelbase) to maintain good vehicle drive characteristics and acceptable stress regimes for the chassis.
Table 3.8 - Crane at rear overhang (subframe secured with shear resistant plates)
Model
Frame section
[mm]
Total torque M
G
max [kNm]
20
20
30
30
40
40
50
50
60
60
70
70
80
80
90
90
100
Minimum value of the section modulus of the subframe section W
x
[cm
3
]
(1)
with yield point of the material equal to 360 N/mm
2
55C, 70C 174x69x5 23 23 32 42 71 E
E = To be checked case-by-case. Send IVECO technical documentation with verification of stress and stability.
(1)
When a higher section modulus is required for the superstructure also use the latter for the crane.
Note
For the dimensions of the profiles see Table 3.2.
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