Maintenance overview
5.4 Measures required for winch monitoring
16.08.2018
Maintenance manual 3 302 577 en 5 - 23
GMK7450
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 h
igh stress in excep-
tional situations, but
which are g
enerally sub-
ject
to only low stress
10% of the running time with
greatest load (dead lo
ad +
1/1 payload)
40% of the running time with
dead
load + 1/3 pa
yload
50% of the running time with
dead load
0.125
Medium
Q 2
L 2
Powe
r unit or parts
thereo
f that are subject
to h
igh stress quite
often, but which are gen-
erally subject to only
min
im
al stress
1/6 of the running time with
greatest load (dead lo
ad +
1/1 payload)
1/6 of the running time with
dead load +
2/3 pa
yload
1/6 of the running time with
dead
load +
1/3 pa
yload
50% of the running time with
dead load
0.25
heavy
Q 3
L 3
Powe
r units or parts
thereof that are subject
to hi
gh 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
thereo
f that are reg
ularly
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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