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− Remove the valve fl ap (746) and the steel sheet (598).
7.5 Assembly
C AU T I O N
Improper assembly results in aggregate damage!
▶ Assemble the aggregate in accordance with the
principal rules of mechanical engineering.
▶ Use original spare parts only.
▶ For aggregate assembly, consult the corresponding
crosssectional drawing.
▶ Assemble the pump/aggregate in a clean and level
assembly area.
Th e following must be observed during assembly:
− Replace seals.
− Install only clean parts.
− Install only inspected and fl awless parts.
− Keep the sliding surfaces of the mechanical seal free
of dirt and grease.
− Observe the specifi ed tightening torques
(→ Tightening torques, page 30).
7.5.2 Assembly of SM30B
Cross-sectional drawing SM30B (→ page 33)
✓ All parts are in a clean and level assembly area.
1. Installation of the stationary unit of the mechanical seal
(047)
− Moisten the auxiliary seal of the stationary unit with
lubricant (alcohol, water).
− Manually press the stationary unit (047) into the
shaft sealing casing (441).
2. Installation of shaft sealing casing (441)
− Position the motor on the fan hood.
− Insert the fi tting key (940) into the motor shaft .
− Adjust the shaft sealing casing (441) (eccentric
opposite the motor feet).
− Force the shaft sealing casing (441) onto the motor
fl ange (800).
− Screw the hexagon nuts (920.1/550.1) onto the stud
bolts (902) and tighten them.
3. Installation of the rotating unit of the mechanical seal
(047)
− Apply a thin layer of lubricant (e.g. grease containing
PTFE) onto the impeller hub (230).
− Push the rotating unit (047) onto the impeller
hub (230) by a screwing movement in the sense of
winding of the spring.
4. Installation of impeller (230)
− Apply grease (Molykote®) to the long thread side of
the impeller screw (906).
− Slide the disc spring stack (950) (individual discs
alternately strung together; SM30B: 8x individual
discs) onto the long thread side of the impeller screw
(906) and lubricate with grease (Molykote®).
− Screw the impeller screw (906) with the disc spring
stack (950) into the motor shaft .
− Apply a thin layer of grease (Molykote®) to the motor
shaft .
− Push the impeller (230) onto the motor shaft .
− Apply a thin layer of liquid sealing compound to the
hub area of the impeller screw (906) on the impeller
(230).
− Slide the washer (550) onto the impeller screw.
− Screw the hexagon nut (920) onto the impeller screw
(906) and slightly tighten it.
5. Setting of impeller gap (230)
− Position the straightedge onto the face of the shaft
sealing casing (441).
− Adjust the axial direction of the impeller (230).
Rotate the impeller screw (906, hexagon socket
wrench) until a gap of 0.1 to 0.15 mm remains
between the straightedge and the impeller hub.
Check the gap size by means of a feeler gauge.
− Block the impeller (230) to prevent rotation.
− Tighten the hexagon nut (920). Do not rotate the
impeller screw (906) when tightening the hexagon
nut (920).
− Check the impeller gap. Rotate the impeller (230).
Check the set gap size in the hub area.
− Repeat the setting if the actual gap size deviates from
the required gap size or the impeller is obstructed.
6. Installation of inter casing (137)
− Screw the valve fl ap (746) and the steel sheet (598)
to the backside of the inter casing (no counterbores
visible) using hexagon head screws (901.1) and
washers (550.3). Secure the screws (901.1) against
loosening (screw locking, e.g. Loctite®).
− Apply a thin layer of liquid sealing compound to the
face of the shaft sealing casing (441).
− Adjust the inter casing (137) to the grooved pins
(561.1) on the face of the shaft sealing casing (441).
− Put the inter casing (137) down on the shaft sealing
casing (441).
7. Installation of pump casing (101)
− Coat the backside (all webs) of the pump casing
(101) with liquid sealing compound.
23
255548 Rev.1
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