Maintenance
WARNING
Risk of injury during disassembly!
Secure the pressure-side gate valve against accidental
opening.
Depressurize the blocking pressure system, if available.
Wear protective gloves, components can become very
sharp-edged due to wear or damage.
Remove
spring-loaded
components
carefully
(e.g.
mechanical seal, stressed bearing, valves etc.), as com-
ponents can be ejected by the spring stress.
Observe the manufacturer's specifications (e.g. for the
motor, coupling, mechanical seal, blocking pressure sys-
tem, cardan shaft, drives, belt drive etc.).
WARNING
Risk of injury during disassembly work on the magnetic
coupling!
Use jacking screws to disassemble the bearing bracket in
order to prevent a sudden moving together of the magnetic
coupling due to magnetic forces.
NOTE
Material damage due to incorrect dismounting/installation
of the pump.
Only specialist mechanics should complete dismounting/
installation work.
7.3.1
Preparations for dismounting
Pump is depressurized
Pump completely empty, flushed and decontaminated
Electrical connections disconnected and motor secured
against switch-on
Pump cooled down
Coupling guard removed
For a coupling with spacer piece: remove distance piece
Pressure gauge lines, pressure gauge and fixtures dis-
mounted
WARNING
Risk of injury during disassembly work on the magnetic
coupling!
Use jacking screws to disassemble the bearing bracket in
order to prevent a springing back of the magnetic coupling
due to magnetic forces.
NOTE
Material damage, fragile components.
Dismount ceramic parts of the plain bearing and magnets
of the magnetic coupling with care, do not hit or knock.
1. Dismantle the pipes on the suction and pressure side.
2. Remove pump from the system.
3. When dismounting, observe the following:
–
Mark the precise orientation and position of all compo-
nents before dismounting them.
–
Dismount components concentrically without canting.
–
Dismount pump (
→
sectional drawing).
7.3.2
Dismantling SHM 20-15
1. Undo the screws (901.1).
2. Remove washers (554.1) and spring rings (934.1).
3. Remove the hydraulic unit complete with volute casing
(102.1) and rear cover (817.1) from the motor bell housing
(341.1).
4. Carefully remove the rear cover (817.1) from the volute
casing (102.1).
5. Remove the sealing ring (412.5) from the rear cover
(817.1).
6. Pull out shaft (210.1) with impeller (230.1), bearing bush
(545.1) and thrust bearing (314.3 and 314.5) from the
volute casing (102.1).
7. Remove the thrust bearings (314.3 and 314.5) from the
shaft.
8. Remove the impeller (230) from the shaft (210.1).
9. Remove bearing bush (545.1) from the impeller (230.1).
300 092
BA-2018.08.21 EN
SHM
23
