Manitowoc GROVE GMK4090 Maintenance Manual page 71

Determining the
operating
conditions (load
spectrum)
H
Load Definition
spectrum
Class
Power units or parts
thereof that are subject
to high stress in excep-
Light
tional situations, but
Q 1
which are generally sub-
L 1
ject to only low stress
Power unit or parts
thereof that are subject
to high stress quite
often, but which are gen-
Medium
erally subject to only
Q 2
minimal stress
L 2
Power units or parts
thereof that are subject
to high stress frequently
Heavy
and medium stress con-
Q 3
tinuously
L 3
Power unit or parts
thereof that are regularly
subjected to high stress
Very
from neighbouring
heavy
stress sources
Q 4
L 4
Maintenance manual
GMK4090
The truck crane's load spectrum is divided into groups (see also ISO 4301/1,
FEM 1.001):
When determining the load spectrum, the existing rope pull is used as the
standard, i.e. under certain circumstances, the truck crane can be support-
ing a small load, whereby the winch is actually supporting a heavy load,
e.g. due to insufficient reeving. Therefore, the following graphic representa-
tion of the load spectrum refers to the winch's wire cables.
Proportions of the running
time
10% of the running time with
greatest load (dead load +
1/1 payload)
40% of the running time with
dead load + 1/3 payload
50% of the running time with
dead load
1/6 of the running time with
greatest load (dead load +
1/1 payload)
1/6 of the running time with
dead load + 2/3 payload
1/6 of the running time with
dead load + 1/3 payload
50% of the running time with
dead load
50% of the running time with
greatest load (dead load +
1/1 payload)
50% of the running time with
dead load
90% of the running time with
greatest load (dead load +
1/1 payload)
10% of the running time with
dead load
5.4 Measures required for winch monitoring
Factor of
the load-
spectrum
Km =
0,125
0,25
0,5
1
3 302 649 en
Maintenance overview
Graphic representation
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