English
Installation and operating instructions Wilo-Drain MTC 32 F 39 - 55
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nants, the mechanical seal must be replaced.
The electrode of our seal monitoring device can
be installed (or retrofitted) instead of the sealing
plug/marked housing to enable monitoring of
the oil chamber.
9.2 Changing oil
WARNING! Risk of injury!
The pumps are heavy and can tip over.
People may be injured if the pump tips over.
Always check that the pump is positioned safely.
WARNING! Risk of injury!
There may be overpressure in the sealing cham-
ber/separation chamber. When unscrewing the
oil drain plug, hot oil may spurt out under pres-
sure, causing injury and scalding. Before remov-
ing the plug, put on protective goggles and undo
the oil drain plug with care.
WARNING! Danger to the environment!
Oil may leak out if the pump is damaged or dis-
mantled.
This can cause damage to the environment.
Avoid damage, or adopt suitable measures to
catch the oil.
NOTE: When you change the oil, the old oil must
be disposed of as hazardous waste. The oil is not
biodegradable.
When changing the oil in the oil chamber, use
mineral oil with a viscosity class of 22 to 46, for
example Spinesso or Nuto from ESSO. The amount
to be filled can be found in the table “Technical
data”.
CAUTION! Danger of damage!
The oil chamber must be filled with the correct
amount of oil. Overfilling the chamber will
destroy the pump.
9.3 Checking the macerator system
Using a suitable tool such as a feeler gauge, you
can measure the cutting gap between the cutting
rotor and cutting plate. If a cutting gap is larger
than 0.2 mm, it must be reduced.
9.3.1 Setting the cutting gap on the MTC 32 F 39
1. Block the cutting rotor with a piece of wood
and unscrew the hexagon socket head screw
using an SW 5 socket spanner.
2. Remove the cap, lock washer and cutting
rotor.
3. Set the macerator by removing an adjusting
washer (max. gap 0.2 mm).
4. Put the cutting rotor, cap and lock washer
back in place, block the cutting rotor with a
piece of wood and tighten it with the socket
spanner. (Tightening torque M
A
8 Nm)
5. Check that the cutting rotor moves smoothly,
and measure the cutting gap again.
If the cutting gap is still too large, repeat
steps 1-4.
9.3.2 Setting the cutting gap on the MTC 32 F 49 or
MTC 32 F 55
1. Block the cutting rotor with a piece of wood
and unscrew the M 10 cap nut.
2. Remove the disc and cutting rotor.
3. Set the macerator by removing an adjusting
washer (max. gap 0.2 mm).
4. Put the cutting rotor and disc back in place,
apply liquid screw lock to the threaded end of
the shaft, block the cutting rotor with a piece
of wood and tighten it with the cap nut (tight-
ening torque M
A
60 Nm).
5. Check that the cutting rotor moves smoothly,
and measure the cutting gap again.
If the cutting gap is still too large, repeat
steps 1-4.
When replacing the cutting plate, liquid screw lock
must always be applied to the fixing screws.
