Replacing The Impeller - Pentair Jung Pumpen Multistream Series Instruction Manual

ENGLISH
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 impeller down to the
nominal dimension 0.5 - 0.8 mm.
6. Block the impeller again and tighten the impeller screw to
65 Nm.
The maximum adjustment possible is 3 mm
Replace the wear plate (...B2, ...B4, ...C1)
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

CAUTION!
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 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. NOTICE! Do not use
grease containing graphite, such as "Molykote".
7. Fix all the parts of the impeller mounting in place and tight-
en the impeller screw until it is "hand tight".
8. Slide the new impeller over the preassembled 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
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