General Overhaul - Wilo Rexa CUT GI Notice De Montage Et De Mise En Service

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9.5.5 Function test of the monitoring device
To test resistances, the pump must be cooled down to
the ambient temperature!
9.5.5.1 Test the resistor of the temperature sensor
Measure the resistor of the temperature sensors with an
ohmmeter. The bimetallic strips must have a measured
value of 0 Ohm (passage).
9.5.5.2 Testing the resistor of the external electrode for seal-
ing chamber control
Measure the resistor of the electrode with an ohmmeter.
The measured value must approach "infinity". For values
≤ 30 kOhm, if there is water in the oil – change the oil!
9.5.6 Oil change in sealing chamber
WARNING
Operating fluid under high pressure!
A pressure of several bar can build up in the motor!
This pressure escapes when the screw plugs are
opened. If screw plugs are opened without due cau-
tion, they can be ejected at high speed! To avoid inju-
ries, observe the following instructions:
• Adhere to the prescribed sequence of work steps.
• Unscrew the screw plugs slowly, but never un-
screw them completely. As soon as the pressure
escapes (audible whistling or hissing of air), stop
turning the screw plug any further!
• When the pressure has completely dissipated,
fully unscrew the screw plugs.
• Wear closed safety goggles.
WARNING
Scalding from hot operating fluids!
Hot operating fluids can also spray out when pressure
is released. This can result in scalding! To avoid inju-
ries, the following instructions must be observed:
• Allow the motor to cool down to the ambient
temperature before opening the screw plugs.
• Wear closed safety goggles or face protection
and gloves.
110
Maintenance and repair
Fig. 9: Sealing chamber: Oil change
+/- Screw plug sealing chamber
‡
Protective equipment has been put on!
‡
Pump has been dismantled and cleaned (decontaminated
if required).
1. Position the pump horizontally on a firm surface. The
screw plug points upwards. WARNING! Risk of hands
being crushed. Ensure that the pump cannot fall over
or slip away!
2. Unscrew the screw plug slowly, but do not unscrew it
completely. WARNING! Overpressure in the motor!
Stop turning the screw plug further if hissing or whist-
ling is audible! Wait until the pressure has completely
dissipated.
3. After the pressure has dissipated, fully unscrew the
screw plug.
4. Place a suitable tank to collect the operating fluid.
5. Drain the operating fluid: Rotate the pump until the
opening points downwards.
6. Check the operating fluid: Notify customer service if an
operating fluid contains metal chips!
7. Pour in operating fluid: Rotate the pump until the open-
ing points upwards. Fill-in the operating fluid into the
opening.
⇒ Comply with the specifications for operating fluid
locations and quantity!
8. 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 power supply cables are checked
for wear and damage. Damaged components are re-
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WILO SE 2019-02