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10.2.5.3
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 and oil quantities (Page 76):
Venting
Procedure
1. After the oil has been drained, wipe the gearbox clean of any remaining mineral oil using a
cloth.
2. Unscrew the vent plug.
3. Fill the gearbox with a flushing oil, using a filter (filter mesh max. 25 μm). For the flushing oil,
use either the new oil or one that is compatible with the new oil and is less expensive.
4. Operate the gearbox for 15 to 30 minutes under a low load.
5. Place a suitable and sufficiently large receptacle underneath the oil drain plug.
6. Remove the oil drain plug. Drain all the oil into the receptacle.
7. After flushing, immediately seal the gearbox using the sealing element.
8. Repeat this step for the second flushing.
You have now flushed the gearbox twice and can pour in the new oil.
SIMOGEAR electric monorail gearbox
Operating Instructions, 01/2024, A5E53220855A/RS-AA
WARNING
Service and maintenance
10.2 Checking and changing lubricants
Oil drain
59
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