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Service and maintenance
8.2 Checking and changing lubricants
8.2.6.3
Flushing the gearbox when changing between incompatible oils
Impermissible mixing of oils results in 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, polyglycol oil 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
We recommend that, after the second flush, the quality of the rinse is checked by an expert
analyzer.
Observe the symbols in the diagrams of the mounting positions (Page 63).
Ventilation
Procedure
1. After the oil has been drained, wipe the gearbox clean of any remaining mineral oil using
a cloth.
2. Unscrew the venting screw.
3. Fill the gearbox with a detergent oil, using a filter (filter mesh max. 25 μm). For the
detergent oil, use either the new oil or one that is compatible with the new oil.
4. Allow the gearbox to run for 15 to 30 minutes under a low load.
5. Place a suitable and sufficiently large receptacle underneath the oil drain plug.
6. Unscrew the oil drain plug. Drain all the oil into the receptacle.
48
WARNING
Oil filling
Operating Instructions, 10/2016, A5E38123453A/RS-AB
Oil drain
BA 2515
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