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DAILY 4x4 ‒ GUIDELINES FOR BODYBUILDERS
APPLICATIONS OF SUPERSTRUCTURES
3.9 INSTALLATION OF TAIL LIFTS
– Printed 692.68.999 – 3 Ed. - Base 08-2020
W
TL
= Weight of tail lift
W
L
= Tail lift capacity
S
L
= Distance of the tail lift from the rear axle
The bending moment on the chassis may be obtained using the following ratio:
M [Nm] = W
L
• A + W
Tl
• B for tail lifts without stabilizers
M [Nm] = W
L
• C + W
TL
• D for tail lifts with stabilizers
The calculations must be carried out considering a platform with a standard length (H = 1200 mm). For longer platforms, the load
on the tail lift must be reduced in proportion to the increase in the length of the platform.
The position of the stabilizers is established according to the values existing in the reference market (S = 950 mm from the rear
axle). If the stabilizers are positioned further forward (< 950 mm), the load on the tail lift must be reduced in proportion to the
reduction of this distance.
To ensure the necessary strength and rigidity, and especially in the case of overhangs exceeding 1200 mm, the connection between
the chassis and the subframe must be made using shear-resistant plates (spaced no further than 400 mm from one another) in the
area of the rear overhang, and must continue up to the front support of the rear suspension (see Figure 17).
To compensate for frame flexing, which is inevitable when the tail lift is in operation, the bodybuilder may use reinforcement struc-
tures with larger dimensions than those indicated in Table 3.9.
This consideration applies even more in the case of high and non-standard overhangs; in this case the necessity to adopt the stabil-
izers must also be verified.
The possibility of using materials with superior mechanical characteristics requires verification of the total moment of resistance of
the chassis plus subframe.
▶ The Bodybuilder must carefully assess any variations in the stability and alignment of the vehicle
caused by suspension compression and the chassis during all stages in the operation of the tail
lift. Always evaluate whether installing stabilisers is advisable even if their use is not rendered
necessary by the stresses sustained by the chassis.
The stabilizers must be attached to the support structure of the tail lift, and should be preferably hydraulically operated.
Note
For the indications relating to the electrical parts, please refer to Section 5. 8.
The bodybuilder is also responsible for:
● type-approval of the application of the tail lift on the vehicle,
● any modifications to the under-run cross member or the arrangement of another new type (see Chapter 2.20 ( ➠ Page 42));
● the observance of the visibility of the rear lights,
● the observance of the overhang angles,
● the positioning of the tow hook,
based on the various national legislation.
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