en
Installation and operating instructions • Wilo-Flumen OPTI-TR 50-3 ... 120-1, Wilo-Flumen EXCEL-TRE 50-3 ... 90-2 • Ed.01/2022-07
35
9.5.8
Oil change
WARNING
Operating fluid under pressure!
High pressure can build up in the motor! This pressure is released when
the screw plugs are
opened
.
• If screw plugs are opened without due caution, they can be ejected at
high speed!
• Hot operating fluid may spray out!
– Wear protective equipment!
– Allow the motor to cool down to ambient temperature before car-
rying out any work!
– Adhere to the prescribed sequence of work steps!
– Unscrew the screw plugs slowly.
– As soon as the pressure escapes (audible whistling or hissing of
air), stop turning the screw plug any further!
– Only when the pressure has been completely released, fully un-
screw the screw plug.
9.5.8.1 Oil change: sealing, gear and pre-
chamber
Flumen OPTI-TR 50-3/60-3-90-2/120-1 and EXCEL-TRE 50-3/60-3/90-2
1
2
3
4
5
6
Fig. 13:
Position of the screw plugs
Flumen OPTI-TR 80-3
6
5
4
3
2
1
Fig. 14:
Position of the screw plugs
✓
Protective equipment used!
✓
Mixer removed, cleaned and disinfected.
