Pentair Jung Pumpen MULTICUT 25/2 ME Instructions De Service page 11

A fixing facility for lifting gear should be
provided above the chamber opening at
a sufficient height.
Example of installation with pump
base or retrofitting or mobile operation.
Assembly: The submersible pump is fit-
ted with a 90° connection and then low-
ered into the chamber or collecting pit
using a chain. For short-term use, the
pump can also be put into operation us-
ing a suitable plug.
Level monitoring can be carried out
using various systems. Their specific
characteristics and requirements can
be found in the relevant operating man-
uals.
In accordance with the explo-
sion protection laws and regu-
lations, JUNG
should never be allowed to run dry or to
operate in "snore" mode.
The pump must switch off when the wa-
ter level sinks to the upper edge of the
pump housing (x in the illustration), at
the very latest. This shut-down must be
implemented via a separate switching
circuit. Dry running for servicing or in-
spection purposes may only take place
outside the potentially explosive area.
A correspondingly larger diameter pipe
should be used for longer pressure
pipelines to avoid pipe friction losses.
Rising pressure pipes must be protect-
ed from frost! A chamber cover must be
selected that is suitable for the intended
use and has the required load-bearing
capacity.
If the pump is malfunctioning, part of
the contents of the oil reservoir could
escape into the pumping medium.
Not Ex-pumps. If a hose is used as a
pressure line, care must be taken to en-
sure that for every pumping operation
the hose is completely empty before the
pump is submersed. Any residual liquid
would obstruct the ventilation of the
pump housing and therefore also hin-
der the pumping operation.
This situation can also occur if the
pump runs dry, pumps down to a lower
lever than that shown in the installation
drawing, or runs in "snore" mode dur-
ing the daily test run.
SERVICING
We recommend that you service the
equipment in accordance with EN
12056-4 and EN 60074-19.
To ensure continued reliability of ser-
vice, we recommend that you take out a
service contract.
Before carrying out any works:
disconnect the pump and the
controls from the mains and
take steps to ensure that it cannot be
emergized again.
Check the cable for mechanical
or chemical damage. A dam-
aged or kinked cable must be
replaced.
When using a chain to lift the
pump, please observe the rel-
evant national regulations re-
garding accident prevention. Lifting
gear must be checked regularly by an
expert in accordance with the legal reg-
Ex-pumps
ulations.
Motors in the EX range con-
form to the "flameproof enclo-
sures" ignition protection cat-
egory. Maintenance works that affect
the explosion protection may only be
carried out by authorised specialists or
by the manufacturer. When carrying out
repairs, all areas next to flameproof
gaps must be checked for damages
and, if necessary, replaced genuine
parts.
Oil check
The oil reservoir is sealed on the outside
with a sealing screw "Öl" (oil). In order
to check the mechanical seal, the oil,
including any residue, must be drained
from the oil reservoir and collected in a
clean measuring container.
∙ If the oil is contaminated with water
(milky), an oil change must be car-
ried 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 mechanical seal as well.
For monitoring the oil reservoir, it is
also possible to retrofit the electrode of
ENGLISH
our "DKG" or DKG-Ex" seal leak con-
trol 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 operating 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
constituents is being pumped, the oil
changes should be carried out at cor-
respondingly shorter intervals.
Use HLP hydraulic mineral oil, viscosity
class 22 to 46, e.g. Mobil DTE 22, DTE
24, DTE 25, to replace the oil in the oil
reservoir.
The volume of oil required is 520 cm³ for
MultiCut 25/2 to 36/2, 750 cm³ for Mul-
tiCut 45/2 and 2600 cm for the MultiCut
75/2 und 76/2.
ATTENTION! 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 connecting and fixing screws of the
installation must be checked to ensure
they are fixed securely. They should be
tightened if necessary.
If the pump performance decreases, or
if increasingly loud noises can be heard
during operation, or if the cutting per-
formance decreases (the pump tends to
become blocked), the impeller and cut-
ting system must be checked for wear
by an expert and replaced if necessary.
Replace the impeller
Worn impellers can have sharp
edges.
1. Block the cutting rotor with a piece of
wood and unscrew the central hexa-
gon socket screw
2. Unscrew the four hexagon so-
cket screws on the top of the spi-
ral housing, and take off the spiral
housing.
3. Fit the new impeller with the feather
key onto the shaft, using the same
number of adjusting washers as be-
fore.
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