Manitowoc Grove GMK 5250L Maintenance Manual page 62

Maintenance overview
5.4 Measures required for winch monitoring
5.4.3
5 - 26
Example
A GMK5250L is equipped with a separate operating hours counter for the
hoist and is classified by Manitowoc Crane Group Germany GmbH as fol-
lows:
Power unit group:
Load spectrum:
Theoretical service life:
The used proportion S of theoretical service life is calculated based on the
individual inspection intervals as follows:
st st
1 inspection (1 year)
The truck crane was used for assembly work during the previous year:
Load spectrum L 1, i.e. Km
The operating hours counter for the main hoist reads 160 h, i.e. T1 = 160 h.
The used proportion S
therefore is:
0.125
×
-------------- -
S = 160 h
i
0.125
Remaining theoretical service life:
D1 = 3,200 h -160 h = 3,040 h.
The above values are entered in the table (see table example p. 5 - 28).
nd nd
2 inspection (2 year)
The truck crane was used for unloading work on docks: Load spectrum:
L 3, i.e. Km = 0.5.
2
The operating hours counter for the main hoist reads 640 h, i.e. during this
period: 640 hrs. – 160 h = 480 h (160 h were used during the first year)
T2 = 480 h
M3
Light L 1, Km = 0.125
D = 3,200 h
= 0.125.
1
of theoretical service life after the first inspection
1
= 160 h
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GMK5250L