English (GB)
9
6. Dismantling and assembly
6.1 General Information
Position numbers of parts (digits) refer to drawings and parts lists;
position numbers of tools (letters) refer to section 5. Service
tools.
Before dismantling
• Switch off the power supply.
• Close the isolating valves, if fitted, to avoid draining the piping
system.
• Disconnect the power supply cable in accordance with local
regulations.
Before assembly
• Order the necessary service kits.
• Clean and check all parts.
• Replace defective parts by new parts.
During assembly
• Lubricate and tighten screws and nuts according to section
4. Torques and lubricants.
• Always replace gaskets and O-rings.
6.2 Dismantling
1. Remove nuts (pos. 36) from pump housing (pos. 6).
2. Remove the pump housing. It may be necessary to use a
plastic hammer (pos. I) or a pinch bar (pos. F) for separating
the pump housing from motor stool (pos. 1a) or cover
(pos. 77).
3. Remove O-ring (pos. 72a) from the motor stool/cover.
4. Hold the impeller with a strap wrench (pos. D) and slacken
impeller nut (pos. 67). Remove the impeller nut, spring washer
(pos. 66a) and washer (pos. 66) from the shaft.
5. Remove impeller (pos. 49) using a puller.
6. Remove key (pos. 11) from shaft (pos. 51).
7. Remove the spacer rings, if any, between impeller and shaft
seal (pos. 105).
Shaft seal, types Bxxx and Dxxx
• Pull off the rotating shaft seal part using two screwdrivers.
Shaft seal, type Axxx
• Pull off the spring retainer using two screwdrivers and remove
the seal ring with O-ring using two screwdrivers.
Pump with separate motor stool (pos. 1a) and clamped cover
(pos. 77)
• Remove the cover.
Pump with separate motor stool (pos. 1a) and screw-fixed
cover (pos. 77)
• Remove the screws holding cover and motor stool together,
and pull off the cover.
Pump with integrated motor stool/cover (pos. 2)
1. Remove coupling guards (pos. 7) and the screws/nuts holding
motor stool (pos. 28 and 36a) and motor together. Remove
motor stool (pos. 2). It may be necessary to loosen the motor
stool from the motor with a plastic hammer.
2. Remove the stationary shaft seal part by pushing it from the
back.
3. Slacken screws (pos. 9) fixing pump shaft (pos. 51) on the
motor shaft.
4. Remove the pump shaft. It may be necessary to loosen it with
a pinch bar or similar tool.
6.3 Replacing the wear rings
Pump with bronze wear rings
1. Insert the hook of puller (pos. C) under wear ring (pos. 45 or
45b).
2. Knock the impact block against the puller end stop. Move the
puller to another position under the wear ring.
3. Knock the new wear ring home with a piece of wood as a
buffer.
4. Repeat steps 1 to 3 for the second wear ring of the pump.
6.4 Assembly
1. Lubricate the motor shaft with O-ring grease.
2. Push pump shaft (pos. 51) home on the motor shaft. Make
sure that the pump shaft does not move when you release it.
3. Apply a drop of Loctite 243 to set screws (pos. 9) and tighten
them into the pump shaft. See section 4. Torques and
lubricants.
4. Fit motor stool (pos. 1a or 2) on the motor.
5. Fit and tighten screws/nuts (pos. 28 and 36a) in the motor
stool. See section 4. Torques and lubricants.
6. Fit mounting bush (pos. A) on the pump shaft.
Pump with separate motor stool (pos. 1a) and clamped cover
(pos. 77)
• Fit the cover on the motor stool.
Pump with separate motor stool (pos. 1a) and screw-fixed
cover (pos. 77)
1. Fit the cover the motor stool and tighten it. See section
4. Torques and lubricants.
2. Spray soapy water on the pump shaft and the mounting bush.
3. Fit stationary shaft seal part (pos. 105) on the shaft. Do not
touch the seal face with your fingers.
4. Press the stationary shaft seal part home with a punch
(pos. B).
Shaft seal, all types
1. Remove the screws, if any, from the rotating shaft seal part
and discard them.
2. Spray soapy water on the rotating shaft seal part.
3. Press the rotating shaft seal part home with a punch (pos. B).
4. Fit spacer rings, if required, between shaft seal and impeller
on the pump shaft.
5. Remove the mounting bush from the pump shaft.
6. Fit key (pos. 11) and impeller (pos. 49) on the shaft.
7. Fit washer (pos. 66), spring washer (pos. 66a) and impeller
nut (pos. 67).
8. Hold the impeller with a strap wrench (pos. D) and tighten the
impeller nut. See section 4. Torques and lubricants.
9. Fit O-ring (pos. 72a) on the cover and lubricate it.
10.Fit pump housing (pos. 6).
11.Fit the cover/motor stool on the pump housing and
cross-tighten nuts (pos. 36). See section 4. Torques and
lubricants.
12.Check that the pump shaft can rotate freely.
13.Fit coupling guards (pos. 7) and tighten the screws. See
section 4. Torques and lubricants.
7. Replacing the valve flap of TPD pumps
Dismantling
1. Remove screws (pos. 211).
2. Remove cover (pos. 210) with gasket (pos. 212).
3. Remove pipe plug (pos. 222).
4. Push out pin (pos. 215).
5. Remove valve (pos. 217).
Assembly
1. Assemble and fit the valve in the pump.
2. Press the assembly pin out using pin (pos. 215).
3. Fit pipe plug (pos. 222).
4. Fit gasket (pos. 212) and valve cover (pos. 210).
5. Fit and tighten screws (pos. 211). See section 4. Torques and
lubricants.
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