Pentair Jung Pumpen MULTISTREAM UC 25/4 C1 Instructions De Service page 11

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
edges.
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 lo-
cated 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.
ATTENTION! Do not use grease con-
taining graphite, such as "Molykote".
7. Fix all the parts of the impeller
mounting in place and tighten the im-
peller screw until it is "hand tight".
8. Slide the new impeller over the pre-
assembled impeller mounting onto the
shaft.
9. Mount the motor unit on the spiral
housing; the cable entry point is oppo-
site 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 Connec-
tion)
∙ Mains supply cable damaged =
repair to be carried out by manufac-
turer only
Pump runs but does not pump
∙ Empty pressure pipe or hose to al-
low 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
ENGLISH
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