May 2015
16 GTH-4016 R - 4018 R - 5021 R
Part No. 57.0009.0607
Second Edition - First Printing
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 outriggers shall be
lowered.
• Site ground consistency can be
roughly estimated
using the tables and picture in this page.
• The resistance of the subsoil is in relation to the
ground type and soil characteristics.
Table 1 indicates the superficial pressure which may
be allowed under the outriggers of the machine.
Type of ground,
soil
characteristics
Allowable
superficial pressure
KPa
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
200
rippable
soil
solid
100
semi-
solid
200
hard
400
Rocks, concrete, heavy
traffic paved roads
above
1000
Table 1
Make sure the machine (wheels and outriggers)
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 outriggers or the wheels.
When working near trenches, lower the outriggers
at a safe distance from the trench edge.
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
