Manitowoc Grove GMK 4100L-1, Operating Manual

Page: 759 / 1016

Rigging work
12.2 Choice of a suitable positioning site
Operating manual 3 302 690 en 12 - 13
GMK4100L-1
2
3
.1
1.
201
7
Load-bearing area
•
Now calculate the required load-bearing area.
•
Check that the surface of the outrigger pad (
à
p. 1 - 17) is larger than the
calculated load-bearing area. If the surface of the outrigger pad is smaller,
you will need to enlarge the load-bearing area.
Example for calculating the required load-bearing area:
If the outrigger pressure is 25 t and the ground has a load bearing capacity of
40 t/m
2
. Then the required ground bearing area for this supporting cylinder is
0.625 m
2
(= 6,250 cm
2
).
If the outrigger pad has a surface of 2,000 cm
2
, you would need to enlarge the
ground bearing area by packing the outrigger pads;
à
p. 12 - 53.
G
Danger of overturning if the load-bearing area is too small!
Ensure that the actual load-bearing area is at least as large as specified in
the table.
This prevents the ground giving way and the truck crane overturning.