General Overhaul - Wilo RexaBloc RE Notice De Montage Et De Mise En Service

MAINTENANCE AND REPAIR
2. Carefully and slowly unscrew the screw plug (D+).
Attention: the oil may be pressurised! This can
cause the screw to be ejected at speed.
3. Place a suitable tank beneath the screw plug (D-)
to collect the oil.
4. Carefully and slowly unscrew screw plug (D-) and
allow the oil to drain out. Dispose of the oil in ac-
cordance with the requirements in the "Disposal"
chapter.
5. Clean the screw plug (D-), renew the seal ring and
screw it back in.
6. Pour the new oil in through the hole for the screw
plug (D+). Note the recommended oils and filling
quantities.
7. Clean the screw plug (D+), renew the seal ring and
screw it back in.
8.3.4. Check the leakage chamber for leaks
The leakage chamber is a self-contained chamber
and receives the leakage chamber from the seal-
ing chamber in the event of faults. If there are
large quantities of water in the leakage chamber,
contact Wilo customer service
Fig. 5: Screw plug
L- Drain hole screw plug
1. If you can place a tank beneath the hydraulics
to collect the oil, you do not need to remove the
hydraulics.
2. Place a collector tank underneath the screw plug
(L-).
3. Carefully and slowly unscrew screw plug (L-) and
allow the oil to drain out. Dispose of the oil in ac-
cordance with the requirements in the "Disposal"
chapter.
4. Clean the screw plug (L-), renew the seal ring and
screw it back in.

8.3.5. General overhaul

In a general overhaul, the normal maintenance
work is carried out and in addition the shaft seals,
O-rings and shaft bearings are checked and re-
placed, if necessary. This work may be performed
only by the manufacturer or an authorised service
workshop.
8.4. Repairs
DANGER due to poisonous substances!
Hydraulics that pump liquids hazardous to
health must always be decontaminated before
undertaking any other work! Otherwise, there
is a risk of fatal injury! Wear the necessary
physical protection equipment!
BEWARE of sharp edges!
Sharp edges can form on the impeller and the
opening on the suction port. There is a risk of
injury! Wear the necessary protective cloth-
ing, such as protective gloves.
Installation and operating instructions Wilo-RexaBloc RE
BEWARE of burns!
The housing parts can heat up to well above
40 °C. There is a risk of burns!
• Never touch parts of the housing with your
bare hands.
• After switching them off, let the hydraulics
cool down to ambient temperature.
• Wear heat-resistant protective gloves!
Before carrying out repairs:
• Have a qualified electrician disconnect the mo-
tor's power supply cable on the motor and secure
it against being switched on inadvertently.
• Allow the hydraulics and motor to cool down and
clean them thoroughly.
• Make sure that all the operationally-relevant
parts are in good condition.
• Always replace O-rings, seals and screw locking
devices (spring lock washers, Nord-Lock wash-
ers).
• The specified tightening torques must be com-
plied with.
• Never use force when carrying out this work!
8.4.1. Use of screw locking
Screw locking is used on all screws. This must
always be renewed after disassembly.
The screw locking can be applied in different
ways:
• Liquid screw locking compound, e.g. Loctite 243
• Mechanical screw locking with Nord-Lock washer
Liquid screw locking compound
Liquid screw locking compound can be unfas-
tened by applying increased force. If this is not
possible, the connection must be heated to
about 300 °C in order to be released. The affected
components must be thoroughly cleaned and,
on assembly, once again have the screw locking
compound applied to them.
Mechanical screw locking
The Nord-Lock washer is only used on bolts with
strength class 10.9 which have been coated with
Geomet.
The Nord-Lock washer must not be used for
screw locking with stainless screws!
8.4.2. Which repair work is allowed to be performed?
• Impeller change
• Replacing the mechanical seal
• Change of hydraulics
• Change of motor
8.4.3. Impeller change
The bearing housing, impeller and motor are
constructed in "back pull out" design. This means
that these components can be removed as a
complete unit. The hydraulics housing remains
installed in the pipe system.
English
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