Jung Pumpen MultiStream UAK 10/2 A1 /4 Instructions De Service page 6

English
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 quantity of oil required is 1000 cm³, except
for A1 and B1 pumps, which must be filled with
800 cm³.
The oil reservoir may only be filled with the
specified quantity of oil. Overfilling will result
in the pump being rendered inoperable.
Cleaning
To clean the impeller and the spiral housing,
simply remove the 4 hexagonal screws and lift
the motor unit off the spiral housing
Worn impellers can have sharp edg-
es.
ATTENTION!
If the wrong screws are un-
screwed, the oil will run out of the oil reservoir.
Tightening torque M for A2 screw materials
A
for M 6 M = 8 Nm
A
for M 8 M = 20 Nm
A
for M 10 M = 40 Nm
A
for M 12 M = 70 Nm
A
for M 16 M = 160 Nm
A
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
operation, the gap dimension between the im-
peller face and the wear plate must be checked
for wear by an expert and replaced if necessary.
Nominal dimension: 0.5 - 0.8 mm.
6 6
Adjust the impeller gap
1. Block the impeller.
2. Loosen the central impeller screw located in
the impeller hub.
3. Loosen the impeller by knocking it gently
with a hammer.
4. Tighten the impeller screw until it is "hand
tight".
5. Adjust the impeller gap by pulling the impel-
ler down to the nominal dimension 0.5 - 0.8
mm.
6. Block the impeller again and tighten the im-
peller screw to 65 Nm.
The maximum adjustment possible is 3 mm
Replace the wear plate
1. Loosen the four cylinder head screws on the
wear plate on the lower pump case.
2. Take out the old wear plate with the seal.
3. Clean the wear plate seat and insert the new
wear plate with a new seal.
4. Tighten the four cylinder head screws again.
5. After this, readjust the impeller gap again.
Replacing the impeller
Worn impellers can have sharp edg-
es.
1. Remove the 4 hexagonal screws and lift the
motor unit off the spiral housing.
2. Block the impeller.
3. Loosen the central impeller screw located in
the impeller hub.
4. Loosen the impeller by knocking it gently
with a hammer and then slide it off the shaft.
5. Clean all the parts of the impeller mounting.
6. Grease the shaft cover on the inside. ATTEN-
TION! Do not use grease containing graphite,
such as "Molykote".
7. Fix all the parts of the impeller mounting in
place and tighten the impeller screw until it is
"hand tight".
8. Slide the new impeller over the preassem-
bled impeller mounting onto the shaft.
9. Mount the motor unit on the spiral housing;
the cable entry point is opposite the discharge
branch.
10. Set the gap dimension to 0.5 - 0.8 mm and
then tighten the impeller screw to 65 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 pump housing.
• Ventilate the pump housing by unscrewing
the "Luft" (air) sealing screw.
The impeller is blocked
• Solids and fibrous matter have become
lodged in the pump housing (please refer to
Maintenance)
Decreased pumping performance
• The impeller is blocked (please refer to
maintenance)
• Rotor gap too large = adjust
• The impeller is worn out = replace it
• Wrong direction of rotation = change 2
phases of the power supply