Manitowoc Grove GMK 5200-1 Maintenance Manual page 55

Determining
the operating
conditions
(load spectrum)
H
Load Definition
spec-
trum
class
Power units or parts
thereof that are subject
to high stress in excep-
tional situations, but
Light
which are generally sub-
Q 1
L 1 ject to only low stress
Power units or parts
thereof that are subject
to high stress quite fre-
quently, but which are
Medium
generally subject to only
Q 2
low 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 units or parts
thereof that are regularly
subjected to the highest
Very
stress from adjacent
heavy
stress sources
Q 4
L 4
Maintenance manual
GMK5200-1
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 representation
of the load spectrum refers to the winch's rope pulls.
Timing period proportions
10% of the timing period with
greatest load (dead load +
1/1 payload)
40% of the timing period with
dead load + 1/3 payload
50% of the timing period with
dead load only
1/6 of the timing period with
greatest load (dead load +
1/1 payload)
1/6 of the timing period with
dead load + 2/3 payload
1/6 of the timing period with
dead load + 1/3 payload
50% of the timing period with
dead load only
50% of the timing period with
greatest load (dead load +
1/1 payload)
50% of the timing period with
dead load only
90% of the timing period with
greatest load (dead load +
1/1 payload)
10% of the timing period with
dead load only
5.4 Measures required for winch monitoring
Factor of
the load
spectrum
Km =
0.125
0.25
0.5
1
3 302 746 en
Maintenance overview
Graphic representation
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