6
6
English
shown in the installation drawing, or runs in
"snore" mode during the daily test run.
In these cases, the pump housing must be ven
-
tilated by unscrewing the "Luft" (air) sealing
screw.
Servicing
We recommend that you service the equip
-
ment in accordance with EN 12056-4 and EN
60074-19.
To ensure continued reliability of service, we
recommend that you take out a service con
-
tract.
Before carrying out any works: dis
-
connect the pump and the controls
from the mains and take steps to en
-
sure that it cannot be emergized again.
Check the cable for mechanical or
chemical damage. A damaged or
kinked cable must be replaced.
When using a chain to lift the pump,
please observe the relevant national
regulations regarding accident pre
-
vention. Lifting gear must be checked regularly
by an expert in accordance with the legal regu
-
lations.
Motors in the UFK range conform to
the "flameproof enclosures" ignition
protection category. Maintenance
works that affect the explosion protection may
only be carried out by authorised specialists or
by the manufacturer. When carrying out re
-
pairs, all areas next to flameproof gaps must be
checked for damages and, if necessary, re
-
placed by genuine parts.
Oil check
The openings for filling and emptying the oil
reservoir are sealed on the outside with a seal
-
ing screw, labelled "Öl". In order to check the
mechanical seal, the oil, including any residue,
must be drained from the oil reservoir and col
-
lected in a clean measuring container.
• If the oil is contaminated with water (milky),
an oil change must be carried out. Check
again after a further 300 operating hours,
but at the very latest after 6 months!
• However, if the oil is contaminated with
both water and pollutants, then not only
the oil must be replaced, but the mechani
-
cal seal as well.
For monitoring the oil reservoir, it is also pos
-
sible to retrofit the electrode of our "DKG" or
DKG-Ex" seal leak control device in place of the
"DKG" sealing screw.
Changing the oil
To ensure operational liability, the first oil
change should be carried out after 300 operat
-
ing hours, with further oil changes carried out
after every 1000 operating hours.
If the number of operating hours is very low,
an oil change should still be carried out at least
once a year.
If wastewater with strongly abrasive constitu
-
ents is being pumped, the oil changes should
be carried out at correspondingly shorter inter
-
vals.
Use HLP hydraulic mineral oil, viscosity class 22
to 46, e.g. Mobil DTE 22, DTE 24, DTE 25, to re
-
place the oil in the oil reservoir.
The filling quantity is 520 cm³ for MultiCut 25/2
to 36/2, 750 cm³ for MultiCut 45/2 and 2600 cm
for the MultiCut 75/2 und 76/2.
The oil reservoir may only be filled with the
specified quantity of oil. Overfilling will result
in the pump being rendered inoperable.
Checking the pump unit
The housing screws for the pump, and the con
-
necting and fixing screws of the installation
must be checked to ensure they are fixed se
-
curely. They should be tightened if necessary.
If the pump performance decreases, or if in
-
creasingly loud noises can be heard during op
-
eration, or if the cutting performance decreas
-
es (the pump tends to become blocked), the
impeller and cutting system must be checked
for wear by an expert and replaced if necessary.
Checking the cutting clearance
Using a suitable tool, e.g. feeler gauge, the cut
-
ting clearance between the cutting rotor and
the cutting plate can be measured. A cutting
clearance of over 0.2 mm must be reduced.
Adjustment of the cutting clearance
1. Block the cutting rotor with a piece of wood
and unscrew the central hexagon socket screw.
2. Take off the compression piece, the cutting
rotor and an adjusting washer and then attach
the compression piece and the cutting rotor
again.
3. Block the cutting rotor and tighten again
with the hexagon socket screw (tightening
torque 8 Nm).
4. Check the freedom of movement of the cut
-
ting rotor and the cutting clearance again (max.
0.2 mm).
If the cutting clearance is still too big, a further
adjusting washer must be removed. Steps 1-4
must be repeated.
Cleaning
Worn impellers can have sharp edg
-
es.
To clean the impeller and the spiral housing
first of all remove the compression piece and
the cutting rotor as described above.Then un
-
screw the 4 hexagon socket screws and remove
the volute casing.
The impeller and the spiral housing can now
be cleaned. After this fit the individual compo
-
nents again and adjust the cutting clearance.
To clean the pump chamber a flushing pipe can
be fitted as and when required. To do so, the
"Luft" (air) sealing screw is removed and in its
place the flushing pipe fitted to the pump.
ATTENTION!
If the wrong screws are un
-
screwed, the oil will run out of the oil reservoir.
Tightening torque M
A
for A2 screw materials
for M 6 M
A
= 8 Nm
for M 8 M
A
= 20 Nm
for M 10 M
A
= 40 Nm
for M 12 M
A
= 70 Nm
for M 16 M
A
= 160 Nm
What to do in the
event of any problems
Pump does not work
• Check mains current (do not use a pin
gauge)
• Fuse faulty = may be too weak (please refer
to Electrical Connection)
• Mains supply cable damaged = repair to be
carried out by manufacturer only
Pump runs but does not pump
• Empty pressure pipe or hose to allow the
non-return valve to open and let the air
escape from the ring housing.
• Ventilate the pump housing by unscrewing
the "Luft" (air) sealing screw.
Cutting system blocked
• Check cutting system and adjust if neces
-
sary
Impeller blocked
• Clean spiral housing and impeller.
Decreased pumping performance
• The impeller is blocked (please refer to
maintenance)
• The impeller is worn out = replace it
• Wrong direction of rotation = change 2
phases of the power supply
