October 2015
Second Edition - First Printing
Part No.
57.0009.0662
GTH-1256 9
Work Area Safety
Only use the machine on firm ground capable of
supporting the maximum combined load of the
machine and payload. If the subsoil collapses,
the machine could tip over. To avoid any risk of
overturning, the following precautions should be
taken:
• Ask your employer (site manager or manager
assistant) if there may be buried pipes, pits,
old tanks, cellar floor, dung yards, etc. under
the ground onto which the stabilizers shall be
lowered.
• A rough estimate of the ground consistency can
be done using the tables and picture in this page.
• The resistance of the subsoil is in relation
to the ground type and geomorphological
characteristics.
Table 1 indicates the superficial pressure which is
allowed under the stabilizers of the machine.
Type of ground,
geomorphological
features
Allowable
super
fi
cial pressure
kg/cm
2
N/mm
2
loose, non-compact soil
generally speaking,
not solid;
special precautions
needed
loamy, peaty,pasty soil
rippable, soft ground
non-cohesive, well com-
pact soil, sand, gravel
2.0
0.2
rippable
soil
solid
1.0
0.1
semi-
solid
2.0
0.2
hard
4.0
0.4
Rocks, concrete, heavy
traffic paved roads
above
10.0
above
1.0
Table 1
Make sure the machine (wheels and stabilizers)
rests on a firm ground to prevent hazardous unstable
conditions. If the ground is not firm enough, position
some support planks, capable of withstanding the
expected loads, under the stabilizers or the wheels.
In presence of trenches, lower the stabilizers at a
safe distance from the trench edge.
a
h
a
&
h
= minimum distances
The distance (a) from the foot of the overhang
shall be adequate to height (h) of the same over-
hang.
If the ground fulfils the required conditions:
a : h = 1 : 1
(values with a grey background in table 1)
In the case of doubts:
a : h = 2 : 1
