Siemens SIMOTICS S-1FG1 Operating Instructions Manual page 151

Draining the oil
Note
Change the oil when warm because oil that is too cold is difficult to remove fully.
Operate the gearbox for 15 to 30 minutes to warm up, if necessary.
Procedure
1. Switch off the power supply to the converter.
2. Unscrew the vent plug.
Figure 9-4
3. Place a suitable and sufficiently large receptacle underneath the oil drain plug.
Figure 9-5
4. Remove the oil drain plug. Drain all the oil into the receptacle.
5. Check the state of the sealing ring on the sealing element. If the sealing ring is damaged,
replace the sealing element with a new one.
6. After draining the oil, seal the gearbox immediately using the sealing element.
You have now drained the oil from the gearbox.
❒
Flushing the gearbox when changing between incompatible oils
Note
Polyglycol oil has a higher density than mineral oil. Polyglycol oil sinks to the bottom in the
gearbox and mineral oil floats on the surface.
This makes the required complete draining of mineral oil from the gearbox extremely difficult.
Note
After the second flush, we recommend that an appropriate analysis institute checks the
quality of the flushed fluid.
SIMOTICS S-1FG1 servo geared motor
Operating Instructions, 07/2019, A5E47360747B AA
Identifying marking of vent plug
Identifying marking for oil drain plug
Service and maintenance
9.2 Inspection and maintenance
149