en
Installation and operating instructions • Wilo-Rexa FIT-S • Ed.01/2022-03
19
9.5.6
Oil change in sealing chamber
WARNING
Operating fluid under pressure!
High pressure can build up in the motor! This pres-
sure 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.
+/-
Fig. 8:
Sealing chamber: Oil change
+/-
Sealing chamber screw plug
✓
Protective equipment used!
✓
Pump has been removed, cleaned and disinfected.
1.
Place the pump on a firm work surface in a horizontal position.
The screw plug should face upwards.
2.
Secure the pump against falling over and slipping!
3.
Unscrew the screw plug slowly.
4.
When the pressure has been released, completely unscrew the
screw plug.
5.
Position a suitable tank to collect the operating fluid.
6.
Drain the operating fluid: Rotate the pump until the opening
points downwards.
7.
Check the operating fluid:
⇒
Operating fluid clear: Operating fluid can be reused.
⇒
Operating fluid contaminated (black): fill with new operat-
ing fluid.
⇒
Operating fluid milky/cloudy: Water in oil. Minor leakage
through the mechanical seal is normal. If the ratio of oil to
water is less than 2:1, the mechanical seal may be dam-
aged. Change the oil and check again four weeks later. If
water is again present in the oil during the second check,
contact customer service!
⇒
Metal chips in the operating fluid: Contact the customer
service!
8.
Pour in operating fluid: Rotate the pump until the opening
points upwards. Pour the operating fluid into the opening.
⇒
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)!
9.5.7
General overhaul
During the general overhaul, the motor bearings, shaft sealings, O-
rings and connection cables are checked for wear and damage.
Damaged components are replaced with original parts. This en-
sures correct operation.
The general overhaul is performed by the manufacturer or an au-
thorised service centre.
9.6
Repairs
WARNING
Risk of injury from sharp edges on the cut-
ting device!
The macerator has extremely sharp edges. In addi-
tion, sharp edges can form on the suction port.
There is a danger of cuts!
• Wear protective gloves!
• Do not touch the macerator!
The following preconditions must be met prior to starting repair
work:
•
Wear protective equipment! Observe the work regulations.
–
Safety shoes: Protection class S1 (uvex 1 sport S1)
–
Protective gloves: 4X42C (uvex C500 wet)
–
Safety goggles: uvex skyguard NT
For detailed marking of frame and disc, see the section on “Per-
sonal protective equipment [
5]”.
•
The pump has been thoroughly cleaned and disinfected.
•
Motor must have cooled down to the ambient temperature.
•
Workplace:
–
Clean, good lighting and ventilation.
–
Firm and stable work surface.
–
Secured against falling over and slipping.
NOTICE! Only carry out the repair work described in these in-
stallation and operating instructions.
For repair work, the following applies:
•
Wipe up spillage quantities of fluid and operating fluid immedi-
ately!
•
Always replace O-rings, gaskets and screw locking devices!
•
Observe the tightening torques in the appendix!
•
The use of force is strictly prohibited!
9.6.1
Instructions on using screw locking devices
A screw locking device can be used on the screws. Screw locking is
done at the factory using two different methods:
•
Thread-locking fluid
