TELLARINI POMPE EEM 20 Livret D'emploi Et D'entretien page 19

IMPORTANT: the noise emitted by pumps type 20, 25, 30, 35 during operation without liquid (that disappears during pum-
ping) does not indicate any trouble, it is due to the fact that in these models the impeller can slide along the shaft to allow
an easy maintenance.
5.3 - DISASSEMBLING OF THE PUMP HYDRAULIC PART
IMPORTANT:
before disassembling or assembling the pump hydraulic part, always set the switch (if present) to position "0"
and disconnect the appliance from the power supply in order to avoid accidentally switching on when parts in
motion are unscreened.
In the inner parts there can be sharp edges, therefore we recommend to handle with care.
The following references are to be found in ill. 1, 2, 3, 4 on the basis of the information given in chapter 2.2, if not otherwise specified.
- Unscrew the cover screws (ref. 30 o ref. 31);
- Remove the cover(ref. 11);
- Remove the impeller (ref. 13) according to the following instructions.
Models of bronze type 20-25-30-35: the impeller slides along the shaft (ref.64); it can be removed simply with your fingers.
Models of bronze type 40-50 and all stainless steel models. The impeller is forced on the shaft; to remove it use a puller with sui-
tably shaped jaws (see ill. 7); in the impeller hub there are two projections for this purpose (see ill. 7); in stainless steel models type
20 make use of the two side projections in the pump body for extraction.
- Remove the feather (ref. 15) ;
- Remove the pump body (ref. 10) from the shaft;
Models type 20 of bronze
- Remove the counterflange (ref. 5) from the pump body;
- remove the gasket (ref. 8) from the counterflange;
5.4 - ASSEMBLING OF THE PUMP HYDRAULIC PART
(for models of bronze type 20, first insert the counterflange (ref. 5) along the shaft and set the gasket (ref. 8);
- Insert the feather (ref. 15) in its seat;
- Place the pump body (ref. 10) along the shaft (ref. 64);
- Place the O-ring (ref. 12) on the pump body;
Models with sliding impeller
- Insert the impeller (ref. 13) into the shaft with your fingers;
- Place the cover (ref. 11) and screw gradually and alternately couples of opposite screws (ref. 30 or ref. 31);
Models with forced impeller
The impeller can be inserted with a metal pipe with its inner diameter wider than the shaft;
- hitting the pipe by a hammer bring the impeller (ref. 13) near the pump body surface leaving a backlash of 0.1 mm;
- Place the cover (ref. 11) and screw gradually and alternately couples of opposite screws (ref. 31);
- hit the back of the shaft (the end on which the motor fan (ref. 1), is installed) with a punch and a hammer;
- switch on the pump and check wether the impeller is rotating freely; if it is blocked, open the pump, correct the impeller position
and try again.
5.5.1 - REPLACEMENT OF THE LIP SEAL (MODELS OF BRONZE TYPE 20)
In this model the lip seal (ref. 67) is seated in the counterflange (ref. 5); to replace it:
- put the counterflange, its edge downwards, on a flat surface (ill. 22);
- hit the lip seal using a round bar with proper dimensions to remove it;
- turn the counterflange round ;
- take the new lip seal and put it on the mouth of its housing with the correct orientation (the spring must be turned towards the pump
inside), ill. 23;
- insert the lip seal into its housing using a round bar with proper dimensions.
5.5.2 - REPLACEMENT OF THE LIP SEAL (MODELS OF BRONZE TYPE 25-30-35-40)
The body of the pump consists of two parts: pump body (ref. 10) and internal back part (ref. 65), which is inserted in the pump body
( illustration 2 shows the parts before assembling, illustration 9 after assembling). To replace the lip seal (ref. 67) you must remove the
internal back part from the pump body.
The illustrations mentioned below show the parts in section.
- Place the pump body on two bearing surfaces of soft material (e.g. wood or aluminium) or of any material provided that two pieces of
paper are put in between (ill. 10).
- Take a round bar (of metal, wood, plastic) with the dimensions shown in illustration 10 and hit the lip seal to remove it from its housing
(ill. 11 ) .
- Put the lip seal on the edge of the internal back part and hit again with a hammer (ill. 12); the internal part will be removed together with
the lip seal (ill. 13);
- Put the pump body on a flat surface (ill. 14); take the new lip seal and put it on the mouth of its housing with the correct orientation (the
spring must be turned towards the pump inside).
- Insert the lip seal into its housing using a round bar with a diameter slightly smaller than the outer diameter of the lip seal (ill. 15 and 16).
- Put the internal back part on the pump body (ill. 17 and 19) with the correct orientation (ill. 18).
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