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ILM for rothe erde
®
slew drives
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Figure 3: Position of lubricated holes -> worm bearing
Note:
Good lubrication is required for the raceway and gearing. It prevents dirt and moisture from penetrating the slew drive. The necessary
service life of the application cannot be reached without lubrication.
Optimal use of lubricant and regular application increase system availability.
In partially installed slew drives, free metal contact surfaces must be adequately protected.
Please ensure that a sufficiently high bolt preload force is main-
tained over the full lifetime of the slew drive. Based on experience,
tightening the bolts during regular lubrication to equalize subsid-
ence is recommended.
Visible seals should be inspected at least every 6 months. Any dirt
should be removed. Seals must be replaced if damaged.
Note:
When cleaning the equipment, please take care that no cleaning
agent comes into contact with the seals or penetrates the raceway
system.
The slew drive is preloaded in the raceway system on delivery.
Over a longer period of operation, this preloading may diminish
and bearing clearance open up.
Prevent damage
Wear measurements allow early detection of technical problems
before they can lead to unplanned equipment downtimes. We rec-
ommend regular (every 12 months) bearing wear measurements
to evaluate the slew drive raceway condition. Wear to the raceway
system presents as a change in the axial motion or subsidence.
This increase in wear can be ascertained by measuring the tilt
clearance or subsidence. Inspection intervals should be adjusted
depending on how rapidly wear develops.
Tilt clearance measurement
We recommend measuring the tilt clearance to ascertain the wear.
The loading principle for such a measurement is shown in Figure
4. The measurement is taken between the lower connecting struc-
ture and the bearing ring bolted into the upper connecting struc-
ture. To minimize the effect of elastic deformation of the connect-
ing structure, the measurement should be taken as close to the
slew drive as possible.
1.5 Inspection
DANGER
Risk of accident and
danger of death if the
maximum permitted
wear limits are exceeded
• The equipment should
be decommissioned
when the wear limits are
reached
SAFETY ADVICE
• Please ensure that the bearing’s wear limits are not reached
during operation. For more information (diagrams/procedures),
please see https://www.thyssenkrupp-rotheerde.com/de/
service/lagerinspektion-und-wartung
• Wear should be ascertained and documented regularly
• The procedure for this is described in the manual
• Please contact thyssenkrupp rothe erde Germany GmbH if you
have any questions
1.5.1 Inspection of bolts
1.5.2 Inspection of sealing system
1.5.3 Inspection of raceway system
Do not use pressure washers on the slew drive. This can damage
the seals and allow water to penetrate.
The slew drive should be lubricated after any intensive cleaning
(see section 1.4 “Lubrication”).
Dial indicator
Connecting structure, top
Connecting structure, bottom
Slew drive
A
B
Determination of tilt clearance
1. Position the slew drive (arm) in the main work area
2. Turn off the equipment and secure it against being turned on
again
3. Make a permanent mark at the measuring position on the slew
drive housing and on the worm gear (top connecting structure)
4. Attach two dial indicators => in areas “A” & “B” (Figure 4)
5. Apply the defined tilting torque in “A” direction (min. 50% of
operating load) => do not twist the slew drive
6. Set both dial indicators to “zero”
7. Apply the defined tilting torque in “B” direction (min. 50% of
operating load) => do not twist the slew drive.
The displayed measurement value is equal to the tilt
clearance and serves as the base value for comparison with
later inspections
8. Log and document all measurements
The maximum permitted bearing clearance (tilt clearance) may not
exceed 2.0 mm.
Note:
If the permitted tilt clearance is exceeded, the slew drive must be
shut down and replaced as safe operation can no longer be
guaranteed.
Figure 4: Schematic depiction of tilt clearance measurement
