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Maintenance and repair
36
WILO SE 2017-06
Motors FK 202, FK 34 and FK 42
+
-
E
Fig. 12:
Motor compartment: Oil change
E
Venting
+
Fill the oil in the motor compartment
-
Drain the oil in the motor compartment
‡
Protective equipment has been put on!
‡
Pump has been dismantled and cleaned (decontaminated if required).
1. Place the pump upright on a firm surface.
WARNING! Risk of hands being crushed.
Ensure that the pump cannot fall over or slip away!
2. Place a suitable tank to collect the operating fluid.
3. Unscrew the screw plug
(E)
slowly, but do not unscrew it completely.
WARN-
ING! Overpressure in the motor! Stop turning the screw plug further if hissing
or whistling is audible! Wait until the pressure has completely dissipated.
4. After the pressure has dissipated, fully unscrew the screw plug
(E)
.
5. Unscrew the screw plug
(+)
.
6. Unscrew screw plug
(-)
and allow the operating fluid to drain out. If a shut-off ball
cock is installed on the outlet opening, open the shut-off ball cock.
7. Check the operating fluid: Notify customer service if an operating fluid contains
metal chips!
8. If a shut-off ball cock is installed on the outlet opening, close the shut-off ball
cock.
9. Clean the screw plug
(-)
, replace the seal ring and screw it back in.
Max. tightening
torque: 8 Nm!
10.Pour the new operating fluid in through the hole of the screw plug
(+)
.
⇒ Comply with the specifications for operating fluid locations and quantity!
11.Clean the screw plug
(+)
and
(E)
, replace the seal ring and screw it back in.
Max.
tightening torque: 8 Nm!
9.6.8
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 caution, they can be
ejected at high speed! To avoid injuries, observe the following instructions:
• Adhere to the prescribed sequence of work steps.
• Unscrew the screw plugs slowly, but never unscrew 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 due to hot operating fluids!
Hot operating fluids can also spray out when the pressure is escaping. This can result
in scalding! To avoid injuries, the following instructions must be observed:
• Allow the pump to cool down to the ambient temperature then open the screw
plugs.
• Wear closed safety goggles or face protection and gloves.
