6
ENGLISH
This modification is carried out as
follows:
Detach the foot strainer or the 3
base feet and remove the cover.
Carefully drill a hole into the 3 mark-
ings with the ø 8 symbols. Deburr
the drill-holes. Re-attach the cover
with the round sealing ring and the
foot strainer or base feet.
MAINTENANCE
Maintenance and inspection of this product must be carried
out in accordance with EN 12056-4. To ensure continued reli-
ability of service, we recommend that you take out a service
contract.
WARNING!
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.
WARNING!
Check the mains cable for signs of mechanical and chemical
damage. Damaged or kinked cables must be replaced by the
manufacturer.
NOTICE!
When using a chain to lift the pump, please observe
the relevant national regulations regarding accident preventi-
on. Lifting gear must be checked regularly by an expert in ac-
cordance with the legal regulations
Oil check
The oil reservoir is sealed on the outside with a brass screw. In
order to check the mechanical seal, the oil, including any resi-
due, 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 carried out. Check again after a further 300 operat-
ing hours, but at the very latest after 6 months!
•
However, if the oil is contaminated with both water and pol-
lutants, then not only the oil must be replaced, but the me-
chanical seal as well.
For monitoring the oil reservoir, it is also possible to retrofit the
electrode of our “DKG” seal leak control device in place of the
brass screw on the oil reservoir.
Changing the oil
To ensure operational reliability, 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 correspond-
ingly shorter intervals.
Use HLP hydraulic mineral oil, viscosity class 22 to 46, e.g. Mo-
bil DTE 22, DTE 24, DTE 25, to replace the oil in the oil reservoir.
The quantity of oil required is 700 cm³ for the US 253, 500 cm³
for the US 251 and US 251 and 300 cm³ for all other US pumps.
NOTICE!
NOTICE!
The oil reservoir must only be filled with the specified
quantity of oil. Overfilling will result in the pump being rendered
inoperable.
Cleaning
The foot strainer prevents coarse impurities from entering the
pump. Regular cleaning of the float and the foot strainer en
-
sures optimum performance and operation.
To clean the impeller in the event of an obstacle or blockage,
the hexagon socket screws on the underside of the pump must
be removed and the foot strainer or cover must be levered off.
On pumps with a 10 mm free passage, the wear plate must be
removed. The impeller can now be cleaned.
CAUTION!
Worn impellers can have sharp edges.
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
QUICK TIPS FOR REMEDYING
FAULTS
Pump does not work
•
Check mains current (do not use a pin gauge)
•
Fuse faulty = may be too weak (please refer to Electrical Con-
nection)
•
Mains supply cable damaged = repair to be carried out by
manufacturer only
Pump runs but does not pump
•
Empty the pressure pipe or hose to allow the non-return
valve to open and the air to escape from the pump housing.
Impeller blocked
•
Solids and fibrous matter have become lodged in the pump
housing = clean
Decreased pumping performance
•
Pump housing obstructed = clean
•
Impeller worn = replace
•
Wrong direction of rotation (for a three-phase current) = ask
a qualified electrician to change 2 phases of the supply line
