Maintenance overview
5.4 Measures required for winch monitoring
07.12.2017
Maintenance manual 3 302 649 en 5 - 23
GMK4090
Determining the
operating
conditions (load
spectrum)
The truck crane's load spectrum is divided into groups (see also ISO 4301/1,
FEM 1.001):
H
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.
s
Load
spectrum
Class
Definition Proportions of the running
time
Factor of
the load-
spectrum
Km =
Graphic representation
Light
Q 1
L 1
Power units or parts
thereof that are subject
to high stress in excep-
tional situations, but
which are generally sub-
ject to only low stress
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
0,125
Medium
Q 2
L 2
Power unit or parts
thereof that are subject
to high stress quite
often, but which are gen-
erally subject to only
minimal stress
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
0,25
Heavy
Q 3
L 3
Power units or parts
thereof that are subject
to high stress frequently
and medium stress con-
tinuously
50% of the running time with
greatest load (dead load +
1/1 payload)
50% of the running time with
dead load
0,5
Very
heavy
Q 4
L 4
Power unit or parts
thereof that are regularly
subjected to high stress
from neighbouring
stress sources
90% of the running time with
greatest load (dead load +
1/1 payload)
10% of the running time with
dead load
1
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