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Installation
6.7
Underrun protection
6.7.1
Vehicle chassis requirements
In order to comply with the applicable underrun protec-
tion standards, there are requirements for the vehicle
chassis on which the rear tail lift is mounted.
The moment of inertia in a cross-section on the cur-
rent frame beam (excluding any support frame) shall
not be less than 937 cm4. The cross-section of the
frame beam shall therefore have at least dimensions of
220x70x4 mm, corresponding to a surface moment of
inertia of 937cm4 around the x-axis. See illustration. If
in doubt, contact ZEPRO for support.
6.7.2
Statutory dimensions for underrun protection
Distance between the beam and the ground when the vehicle is unloaded:
Max. 450 mm for vehicles with air suspension.
Max. 500 mm for vehicles with conventional suspension.
If the exit angle with the above setting is less than 8º, the distance between beam and ground in an unladen ve-
hicle may be increased until the angle is 8º, but to Max. 550 mm.
Horizontal distance from the outermost part of the platform to the underrun protection: Max. 300 mm. See illustra-
tion below.
NOTE!
The underrun protection may be placed further back and lower.
www.zepro.com
Image 32. The cross-secton of the frame beam
m
The above dimensions are the minimum permit-
ted for the installation of underrun protection.
The strength requirements for mounting the tail
lift usually require larger dimensions.
8º
Image 33. Statutory dimensions
70
Y
R6(x2)
70
WARNING!
Max 300 mm.
Max 450 mm.
(Air suspension)
Max 500 mm.
(Spring suspension)
Z 10/15/20
25
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