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paper are placed between surface and body (Fig. 11).
- Take a solid drift (with diameter 28-29 mm and length greater than 60
mm) and strike the lip seal until it is extracted from its seat (Fig. 12).
- Place the lip seal against the edge of the rear internal part as shown in
Fig. 13 and strike it again with the solid drift and hammer; the internal part
will be removed together with the lip seal (Fig. 14).
- Place the pump body on a surface (Fig. 15); take an identical new lip seal
and place it against the mouth of its seat, facing in the correct direction
(the spring must be facing the inside of the pump).
- Insert the lip seal in its seat by striking it using a solid drift with a slightly
smaller diameter to that of the outer diameter of the lip seal until it has
been completely inserted (Figs. 16 and 17).
-Place the rear internal part against the body (Figs. 18 and 20) facing in
the correct direction (Fig. 19).
- Insert the internal part into the body using a solid drift of appropriate
dimensions (Figs. 21 and 22).
9.2.3 – REPLACING THE MECHANICAL SEAL
- Carry out the disassembly procedure without extracting the pump body;
for models type 20 also remove the body (ref. 10), extracting it from the
counterflange (ref. 5)
- Remove the fixing system of the rotating part of the mechanical seal (this
can belong to one of the types in Fig. 3B).
- Extract the rotating part of the seal (ref. 67A), the counterface (ref. 67B)
and the shroud (ref. 67C).
- Take an identical seal, separate shroud and counterface, clean the
lapped races of the rotating part and of the counterface with a soft cloth;
degrease the housing in the pump body and in the shaft, lubricate rubber
parts with soap and water.
-Insert the shroud into the seat in the pump body, followed by the
counterface.
- Insert the rotating part of the seal taking care that its rubber parts are not
damaged when passing over sharp parts.
- Remount the fixing system of the rotating part of the seal; for systems
provided with screws, clamp these so that the length of the rotating part is
between 13 and 14 mm.
9.3 – REPLACING THE BRUSHES
The two brushes (ref. 7) provided in direct current pumps are sliding
contacts subject to wear and must be replaced periodically; a brush is
completely worn when the brush spring is bottomed out; when the brushes
are worn operation first become irregular and then the pump stops; to
replace:
- remove the fan cover (ref. 2)
- unscrew the 2 screws on the brush holder (ref. 6) that connect the wires
of the 2 brushes to the motor winding;
- lift the springs that hold the brushes in place, extract them, replace them
and connect the wires using the 2 screws;
- remount the fan cover.
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