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4. Dismantling and assembly
4.1 General information
Follow these instructions if it is necessary to dismantle the pump, either because it is clogged or damaged. Position numbers of
parts (digits) refer to
; position numbers of tools (letters) refer to
Before dismantling
•
Disconnect the electricity supply to the motor.
•
Close the isolating valves, if fitted, to avoid draining the system.
•
Remove the electric cable in accordance with local regulations.
Before assembly
•
Clean and check all parts.
•
Replace defective parts with new parts.
•
Order the necessary spare parts.
•
Gaskets and O-rings should always be replaced when the pump is overhauled.
During assembly
•
Lubricate and tighten screws and nuts with the correct torque. See
2. Tightening torques and lubricants
4.2 Removing the pump head and motor
1. Place a container underneath the pump.
2. Slacken the air vent screw (pos. 17) and remove the drain plug (pos. 20) in the bottom flange.
3. Empty the pump of liquid, if any.
4. Lift the motor with pump head (pos. 2) by a pulley or similar device.
5. Remove the nuts (pos. 36) fixing the pump head (pos. 2) with the motor to the pump housing (pos. 6).
6. Loosen the pump head from the pump housing with a pinch bar (pos. A).
7. Carefully pull the pump head and motor until the impeller (pos. 49) is free of the pump housing (pos. 6).
8. Remove the O-ring (pos. 72a).
4.3 Removing the impeller
1. Remove the pump head and motor. See
4.2 Removing the pump head and motor
.
2. Remove the nut (pos. 67) holding the impeller (pos. 49).
3. Remove the spring washer (pos. 66a) and washer (pos. 66).
4. Remove the impeller (pos. 49) and distance piece (pos. 103).
4.4 Removing the shaft seal and pump head
1. Remove the impeller. See
.
2. Remove the rotating shaft seal part (pos. 105).
3. Remove the nuts (pos. 36a) and bolts (pos. 28a) holding the pump head (pos. 2) and the motor together.
4. Pull the pump head (pos. 2) free of the pump shaft (pos. 51).
5. Press the stationary shaft seal part out of the pump head from the motor end.
6. Remove the O-ring of the shaft seal from the pump head.
4.5 Removing the pump shaft
1. Slacken the two set screws (pos. 9) fixing the pump shaft (pos. 51) to the motor shaft.
2. Pull the pump shaft (pos. 51) off the motor shaft.
4.6 Fitting the pump shaft
1. Fit the key into the keyway of the motor shaft (pos. 51).
2. Fit the pump shaft (pos. 51) to the motor shaft, making sure to press the pump shaft home on the motor shaft.
3. Tighten the two set screws (pos. 9) to a torque of 15 Nm so that the pump shaft is fixed on the motor shaft.
4.7 Fitting the pump head and shaft seal
1. Fit the pump head (pos. 2) over the pump shaft (pos. 51). Take care not to damage the pump shaft.
2. Bolt together the motor and pump head using the bolts (pos. 28) and nuts (pos. 36a).
(Tightening torque: M8: 12 Nm, M12: 40 Nm or M16: 100 Nm).
3. Lubricate the shaft seal (pos. 105) with soapy water and fit it carefully on the pump shaft.
