14
ILM for rothe erde
®
slew drives
15
Wear on the worm and bearing gear teeth increases the
circumferential backlash. For this reason, the backlash
must be inspected every 12 months.
If the maximum permitted circumferential backlash is reached,
the slew drive must be shut down and replaced as safe
operation can no longer be guaranteed.
Determining the circumferential backlash
from the rotation angle
1. Position the slew drive (arm) in the main loading area.
2. Turn off the equipment and secure it against being
turned on again.
3. Permanently mark the measuring position on both
the housing and worm gear/toothed ring.
4. Remove the drive so that the worm shaft can easily
be rotated by hand.
5. Determine the rotation angle of the worm shaft
(without turning the worm gear). Make markings on t
he drive flange and worm gear if necessary.
6. Log and document the measurements.
A lubricant analysis can be done in addition to the wear
measurements in order to obtain more precise information about
the condition of the raceway system and gearing.
These two results together allow for more accurate evaluation of
wear and determination of further action.
thyssenkrupp rothe erde Germany GmbH will perform the analysis
of the grease sample. Please contact us.
1.5.4 Inspection of worm gear’s circumferential
backlash
1.5.5 Lubricant analysis
All later inspections must be carried out at the same
measurement location (housing/worm gear).
The rotation angle when the equipment is new can be
used as a comparison for later inspections.
Gear tooth
module
max. rotation angle
5
30°
6
28°
7
28°
Installation
Maintenance/Inspection
Repairs
Miscellaneous
Evaluation of contact surfaces /
laser measurement
Wear measurement
Repairs
Training
Bearing assembly
Bolt check
General tune-up
Technical support
Reference measurement
Lubricant analysis
Start-up
Seal replacement
1.6 Disposal at end
of useful life
1.7 thyssenkrupp
rothe erde services
The slew drive must be disposed of cor-
rectly and in compliance with applicable
waste regulations at the end of its useful
life.
We offer the following services to ensure the continuous, uninter-
rupted operation of our slew drives:
You can find more information on our website at
https://www.thyssenkrupp-rotheerde.com/de/service
WARNING
Disposal may cause environmental
hazards
• Please comply with waste regulations
• Please comply with national regulations
