Maintenance
8.2 Inspection and maintenance
Planetary gearboxes for servomotors
Operating Instructions, 09/2020, A5E50494253B AA
59
8.2.2 Checking tightness of fastening bolts
Note
Replace unusable headless screws with headle
ss screws of the same design and property
• Switch off the power supply to the drive unit.
• Check all fixing screws for tightness using a torque wrench.
You will find the permissible torques in chapter Mounting instructions (Page 38)
8.2.3 Cleaning servomotors with planetary gearbox
Electric shock when cleaning due to failing to observe the protection class
When cleaning, especially with high-pressure cleaning equipment, water can enter
energized parts and cause an electric shock.
• Clean the motor in a manner appropriate for its protection class.
• Avoid pressurized water on connectors, terminal boxes, and other live parts.
Avoid aiming pressurized water at the gearbox shaft sealing rings.
When required, clean the motor and the gearbox to remove any dust and dirt as required. In
this way, you ensure adequate heat dissipation.
8.2.4 Bearing replacement interval
The bearings are subject to wear and must be replaced after a defined number of operating
hours.
For average load levels, the bearings must be replaced after approx. 25,000 hours.
Bearing replacement intervals can be extended if the motor is operated under favorable
conditions, e.g. low average speeds, low radial forces (cantilever forces), vibration load.
Note
Harsh operating conditions
ject to harsh operating conditions (e.g. continuous operation at nmax, high
vibration/shock loads, frequent reversing duty etc.), the bearing replacement intervals t
LW
can
decrease by up to 50%.
If the planetary gearbox has reached its calculated service life, we recommend that the
bearings or the gearbox are replaced and checked for wear.
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