Maintenance overview
5.4 Measures required for winch monitoring
5 - 24 3 302 574 en Maintenance manual
GMK3060
03.11.2017
One of the load spectra listed above should be selected on the basis of the
actual operating conditions and entered in the crane logbook for the respec-
tive testing interval.
Note for truck cranes:
The load spectrum L1 and the factor of the load spectrum Km = 0.125 are
generally applied to truck cranes in assembly mode.
Determining the
effective operat-
ing hou
rs 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
are displayed in the Operating hours
submenu
; à Operating Instructions.
Determining the
proportion of the-
oretical service
life used
For a testing interval
i (max. 1 year according to ISO 9927-1 or DGUV
Regulation 52 (BGV D 6) /DGUV Regulation 54 (BGV D 8)) the used propor-
tion of the theoretical service life 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 pe
rformed.
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 = Factor of the load spectrum used as the basis for winch calculation.
This factor is specified 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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