en
Maintenance and repair
74
WILO SE 2021-10
9.5.8.2
Oil change in seal housing
(TR 30-1/40-1, TRE 30/40)
+
-
Fig. 12:
Oil change
+
Fill oil in the seal housing
-
Drain oil in the seal housing
‡
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. Unscrew the screw plug
(-)
and drain the operating fluid.
NOTICE! Flush the sealing chamber to drain it completely.
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. Clean the screw plug
(-)
, replace the seal ring and screw it back in.
Max. tightening
torque: 8 Nm (5.9 ft·lb)!
8. Pour 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. tightening
torque: 8 Nm (5.9 ft·lb)!
10.Restore corrosion protection: Seal screw plug, e.g. with Sikaflex.
9.5.9
General overhaul
The following components are checked for wear and damage as part of general main-
tenance:
ƒ
Motor bearings
ƒ
Gear bearing and planetary gear speed
ƒ
Propeller
ƒ
Shaft sealings
ƒ
O-rings
ƒ
Connection cable
ƒ
Fitted accessories
Damaged components are replaced with original parts. This will ensure correct opera-
tion. The general overhaul is performed by the manufacturer or an authorised service
centre.
9.6
Repairs
WARNING
Risk of injury from sharp edges!
Sharp edges can form on the propeller blades. There is a danger of cuts and similar
injuries!
• Wear protective gloves!
