Flushing The Gearbox When Changing Between Incompatible Oils - Siemens SINAMICS G115D Operating Instructions Manual

Additional information on the SIMOGEAR geared motor
11.3 Specific data gearbox
Procedure
1. Switch off the power supply to the drive unit.
2. Unscrew the vent plug.
3. Place a suitable and sufficiently large receptacle underneath the oil drain plug.
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.
11.3.24.8

Flushing the gearbox when changing between incompatible oils

Impermissible mixing of oils leads to damage
Residual quantities of original oil can impair the specific properties of the new oil.
A flushing process is required with biodegradable and physiologically safe oils.
The residual corrosion protection oil must amount to no more than 1% of the operating oil
volume.
Note
Polyglycol oil has a higher density than mineral oil. Therefore, it sinks down towards the oil
drain and the mineral oil floats on top.
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.
Observe the symbols in the diagrams of the Mounting positions (Page 448):
Venting
440
WARNING
Oil drain
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
SINAMICS G115D distributed drive