Manitowoc Grove GMK 4100L-1 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
exceptional situations,
Light
but which are generally
Q1
L1 subject to only low
stress
Power units or parts
thereof that are subject
to high stress quite
frequently, but which
are generally subject to
Medium
only low stress
Q2
L2
Power units or parts
thereof that are subject
to high stress frequently
Heavy
and medium stress
Q3
continuously
L3
Power units or parts
thereof that are regularly
subjected to the highest
Very
stress from adjacent
heavy
Q4 stress sources
L4
Maintenance manual
GMK 4100L-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
supporting 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.
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 timing period with
dead load only
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 timing period with
dead load only
50% of the running time with
greatest load (dead load + 1/
1 payload)
50% of the timing period with
dead load only
90% of the running time 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
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Maintenance overview
Graphic representation
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