SUPERSTRUCTURE MAINTENANCE
TMS9000-2 SERVICE MANUAL
5-10
Published 01-14-2021 Control # 707-01
MEASURES REQUIRED FOR HOIST
MONITORING
NOTE:
Also observe the information on the general
inspection of the hoists.
These measures for monitoring the hoists (hoisting gear)
were compiled by VDMA and are to be used for all vehicle
cranes according to the
Accident Prevention regulations
Winches, Hoisting and Tractor Machines BGV D 6 (VGB 9
)
and
BGV D 8 (VBG 8)
.
Theoretical Service Life
The theoretical service life is the result of certain operating
conditions and a theoretical operating time assumed by the
design engineer when calculating and dimensioning the
winches of your crane.
The winches of your crane are classified as follows (ISO
4301/1, FEM 1.001, DIN calculation rules for power units):
Power unit group:
M
......
Load spectrum:
Q
.....; (L.....)
Load spectrum factor:
Km
=
......
Theoretical service life:
D
=
......
The power unit group M 3 and the collective load L1 (Km =
0.125) are generally given for truck cranes in erection mode,
resulting in a theoretical service life of 3200 h.
The real service life of a hoist is affected by a number of
additional external factors, such as:
•
Overloading caused by improper use of the crane.
•
Insufficient maintenance: oil is not changed in the
specified intervals.
•
Incorrect operation: extreme acceleration or retardation
of the load, load drops and stops suddenly while
suspended.
•
Improper maintenance: using wrong oil, incorrect
quantity, contamination during oil change.
•
Improper assembly during maintenance and repair
work.
•
Leaks which were ignored.
•
Improper adjustment of safety devices.
•
Concealed damage caused by accidents.
•
Extreme environmental low or high temperatures,
conditions: aggressive atmosphere, dust and dirt.
Proportion of the Theoretical Service Life
Used
The crane operator must perform a crane inspection at least
once a year (ISO 9927-1 and BGV D 6 (VGB 9) / BGV D 8
(VBG 8)).
This includes establishing the proportion of the theoretical
service life that has been used. If required, the crane
operator is to appoint an expert for this assessment.
The actual operating conditions (load spectrum) and the
operating hours of the hoists are to be determined for each
inspection interval when establishing the proportion of the
theoretical service life that has been used. The operator is
responsible for proper documentation in the crane logbook.
CAUTION
The theoretical service life is not the same as the real
(actual) service life of a hoist.
Fo
r
Reference
Only