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Faults, causes and remedies
24
WILO SE 2019-02
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 in-
juries, 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 pres-
sure is released. This can result in scalding! To avoid
injuries, 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.
1
Fig. 9:
Sealing chamber: Oil change
1
Screw plug sealing chamber
‡
Protective equipment has been put on!
‡
Pump has been dismantled and cleaned (decontamin-
ated 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
whistling is audible! Wait until the pressure has com-
pletely 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 dam-
age. Damaged components are replaced with original parts. This
will ensure correct operation.
The general overhaul is performed by the manufacturer or an au-
thorised service centre.
10
Faults, causes and remedies
DANGER
Danger due to fluids hazardous to health!
Danger of death in case of pumps with fluids hazard-
ous to health! Wear the following protective equip-
ment while performing the work:
• Closed safety goggles
• Breathing mask
• Protective gloves
⇒ The equipment listed here is the minimum re-
quirement, observe the specifications of the
work regulations! The operator must make
sure that the personnel have received and read
the work regulations!
