24 255548 Rev.1
− Adjust the pump casing (101) (inlet/outlet nozzle
opposite the motor feet).
− Put the pump casing (101) down on the inter casing.
− Fasten the pump casing (101) to the shaft sealing
casing (441) using hexagon head screws (901/550.1).
7.5.3 Assembly of SM55-SM250B
Cross-sectional drawing SM55/75B (→ page 35)
Cross-sectional drawing SM100B (→ page 36)
Cross-sectional drawing SM200-/250B (→ page 37)
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 push the stationary unit (047) (only adjust
the stationary unit of SM200/250, due to lock washer
(931)) 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) onto the stud bolts
(902) and tighten them (SM200/250B only).
− Screw the hexagon head screws (901.1/550.1) into
the shaft sealing casing (441) and tighten them
(SM55/75/100B only).
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; SM55B: 11x individual
discs, SM75B: 13 x individual discs, SM100: 6 x
individual discs, SM200B: 4 x individual discs,
SM250B: 6 x individual discs) onto the long thread
side of the impeller screw (906) and coat 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 33)
to the hub area of the impeller screw (906) on the
impeller (230).
− Slide the washer (550) onto the impeller screw (906).
− Screw the hexagon nut (920) onto the impeller screw
(906) and slightly tighten it.
5. Setting of impeller gap (230)
− Put the straightedge onto the supporting surface
of the inter casing (137) on 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 again.
− 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 (901.2). Secure
the screws (901.2) against loosening. Use screw
locking (e.g. Loctite®).
− Insert an O-ring (412) into the groove of the pump
casing (101).
− Adjust the inter casing (137) to the grooved pin (562)
in the pump casing (101).
− Force the inter casing (137) into the pump casing
(101).
− SM55/75/200/250B only: Fasten the inter casing
(137) to the pump casing using a countersunk screw
(900).
− SM100B only: Fasten the inter casing (137) to the
pump casing by inserting a hexagon head socket
screw (914) through the pump casing (101).
− SM100B only: Screw a screw plug (903/411) into the
pump casing (101) and tighten it.
