Wilo -Flumen EXCEL-TRE 20 Installation And Operating Instructions Manual page 73

9.5.8 Oil change
9.5.8.1 Oil change seal housing
(TR 20-1/22/28-1, TRE 20)
Fig. 11: Oil change
Installation and operating instructions Wilo-Flumen OPTI-TR 20-1, 22, 28-1, 30-1, 40-1, Wilo-Flumen EXCEL-TRE 20, 30, 40
Maintenance and repair
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 carrying 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 unscrew the
screw plug.
+/- Drain/fill seal housing oil
‡
Protective equipment used!
‡
Mixer removed, cleaned and disinfected.
1. Place mixer on a firm work surface in a horizontal position.
CAUTION! Material damage! Do not set the mixer down on the propeller! Use an
appropriate platform for the propeller diameter.
2. Secure the mixer against falling over and slipping.
3. Position a suitable tank to collect the operating fluid.
4. Unscrew the screw plug (+/-).
+/-
5. Tip the mixer and allow the operating fluid to drain out.
6. Check the operating fluid:
⇒ Operating fluid clear: Operating fluid can be reused.
⇒ Operating fluid contaminated (black): fill with new operating fluid.
⇒ Operating fluid milky/cloudy: Water in oil. Minor leakage through the mechan-
ical seal is normal. If the ratio of oil to water is less than 2:1, the mechanical
seal may be damaged. Change the oil and check again four weeks later. If wa-
ter is again present in the oil during the second check, contact customer ser-
vice!
⇒ Metal chips in the operating fluid: Contact the customer service!
7. Readjust the mixer so that the opening points upwards.
8. Pour the new operating fluid in through the hole for the screw plug (+/-).
⇒ Comply with the specifications for the operating fluid type and quantity.
9. Clean the screw plug (+/-), replace the seal ring and screw it back in. Max. tighten-
ing torque: 8 Nm (5.9 ft·lb)!
10.Restore corrosion protection: Seal screw plug, e.g. with Sikaflex.
en
73