Maintenance overview
5.4 Measures required for winch monitoring
5 - 24 3 302 744 en Maintenance manual
GMK5250L
09.03.2018
One of the load spectrums listed above should be selected on the basis of
the actual operating conditions and entered in the crane logbook for the
respective testing interval.
Note for truck cranes:
The load spectrum L1 and the load spectrum factor Km = 0.125 are generally
applied to truck cranes in assembly mode.
Determining the
effective operat-
ing hours T
i
The effective winch operating hours must be entered in the crane logbook
for the respective inspection interval.
– The effective winch operating hours T
i
displayed in the Operating hours
submenu
; à Operating manual.
Determining the
proportion of
theoretical service
life used
For an inspection interval i (max. 1 year according to ISO 9927-1) or BGV D 6
(VBG 9) / BGV D 8 (VBG 8), the proportion of theoretical service life used S
i
is calculated using the formula:
This used proportion is subtracted from the remaining theoretical service
life D
i
after every inspection interval (see example in the appendix to this
chapter).
If the remaining theoretical service life is not sufficient for the next operating
period, then a general overhaul of the winch must be performed.
If theoretical service life D has been reached (à Theoretical service life,
p. 5 - 21), the winch must not be operated until after a general overhaul has
been performed.
A general overhaul must always be performed at least once every 10 years
after putting the truck crane into operation.
Km = Load spectrum factor used as the basis for winch calculation. This
factor is given in the operating manual.
Km
i
= Load spectrum factor in inspection interval i in accordance with the
section ”Determining the operating conditions (Load spectrum)”
T
i
= Effective operating hours in the testing interval i as described in
the section ”Determining the actual operating hours T
i
”
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