Maintenance Tasks - Wilo Drain MTC 32F Serie Einbau- Und Betriebsanleitung

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8.2.2. After 1000 service hours or 1 year
• Functional inspection of all safety and control
devices
• Check the cutting gap
• Change the oil
Moisture sensors, if used, indicate when the oil is
to be changed.
8.2.3. 10,000 service hours or 10 years at the latest
• General overhaul

8.3. Maintenance tasks

8.3.1. Checking the insulation resistance
To check the insulation resistance, the power
supply cable must be disconnected. The resis-
tance can then be measured with an insulation
tester (measuring voltage = 1000 V). The follow-
ing values may not be exceeded:
• For the initial start-up: The insulation resis-
tance may not be less than 20 MΩ.
• For further measurements: The value must be
greater than 2 MΩ.
If the insulation resistance is too low, mois-
ture may have penetrated the cable and/or the
motor. Do not connect the machine. Consult the
manufacturer.
8.3.2. Functional test of safety and monitoring de-
vices
Monitoring devices include temperature sensors
in the motor, sealed volume monitors, motor
protection relays, overvoltage relays, etc.
• Motor protection relays, overvoltage relays and
other tripping devices can generally be triggered
manually for test purposes.
• To inspect the sealing room monitor or the tem-
perature sensor, the unit must be cooled to ambi-
ent temperature and the electrical supply cable of
the monitoring device in the switch cabinet must
be disconnected. Then test the monitoring device
with an ohmmeter. The following values should
be measured:
• Bi-metal sensor: Value = "0" – throughput
• Moisture sensor: This value must tend towards
infinity. If there is a low value, there is water
in the oil. Also observe the instructions of the
optionally available evaluation relay.
In the case of larger deviations, please consult
the manufacturer.
8.3.3. Turn the impeller
1. Lay the unit horizontally on a firm surface.
Make sure that the unit cannot fall over and/or
slip away.
2. Hold the blade of the macerator and turn the
impeller.
BEWARE of sharp edges!
The blade of the macerator has sharp edges.
There is a risk of injuries! Wear protective
gloves.
46
8.3.4. Oil check or oil change
The oil separation chamber has a plug for draining
and filling oil.
On the MTC 32F17...F33 this is marked on the
illustration.
On the MTC 32F39...F55 the plug is marked on
the housing with the label "oil".
Fig. 6.: Position of the plug
1 Plug
Oil level check
1. Lay the unit horizontally on a firm surface with
the plug facing upwards.
Make sure that the unit cannot fall over and/or
slip away.
2. Slowly and carefully remove the plug.
Caution: The lubricant may be pressurized. This
can force the plug out.
3. The lubricant must reach to about 1 cm below the
plug opening.
4. If there is not enough oil in the oil separation
chamber, top it up. When doing so, follow the
instructions under "Changing the oil".
5. Clean the plug, fit with a new sealing ring if nec-
essary and screw it in again.
Oil change
1. Lay the unit horizontally on a firm surface with
the plug facing upwards.
Make sure that the unit cannot fall over and/or
slip away.
2. Slowly and carefully remove the plug.
Caution: The lubricant may be pressurized. This
can force the plug out.
3. Drain off lubricant by turning the unit until the
opening faces downwards. Collect the lubricant in
a suitable container and dispose of according to
the requirements in the "Disposal" section.
4. Turn the unit back until the opening is facing
upwards again.
5. Fill the new lubricant by means of the opening in
the plug. The oil must reach to about 1 cm below
the opening. Comply with the specified lubricants
and filling quantities.
6. Clean the plug, fit with a new sealing ring and
screw it in again.
8.3.5. Checking the cutting gap
Use a feeler gage to measure the gap between
the blade and the cutting plate. If the gap is more
than 0.2 mm, the macerator has to be adjusted.
8.3.6. General overhaul
During a general overhaul, the bearings, shaft
seals, O rings and power supply cables are in-
spected and replaced as required in addition to
normal maintenance work. This work may only be
MAINTENANCE
WILO SE 2016-07 V4.0 DIN A4